├── DraggableViewControllerDemo.xcodeproj
    ├── project.pbxproj
    ├── project.xcworkspace
    │   └── contents.xcworkspacedata
    └── xcuserdata
    │   └── saiday.xcuserdatad
    │       ├── xcdebugger
    │           └── Breakpoints_v2.xcbkptlist
    │       └── xcschemes
    │           ├── DraggableViewControllerDemo.xcscheme
    │           └── xcschememanagement.plist
├── DraggableViewControllerDemo
    ├── AppDelegate.h
    ├── AppDelegate.m
    ├── Assets.xcassets
    │   └── AppIcon.appiconset
    │   │   └── Contents.json
    ├── Base.lproj
    │   └── LaunchScreen.storyboard
    ├── BaseAnimator.h
    ├── BaseAnimator.m
    ├── DummyView.h
    ├── DummyView.m
    ├── Info.plist
    ├── MiniToLargeViewAnimator.h
    ├── MiniToLargeViewAnimator.m
    ├── MiniToLargeViewInteractive.h
    ├── MiniToLargeViewInteractive.m
    ├── NextViewController.h
    ├── NextViewController.m
    ├── ViewController.h
    ├── ViewController.m
    └── main.m
├── README.md
└── draggable_view_controller-1.gif


/DraggableViewControllerDemo.xcodeproj/project.pbxproj:
--------------------------------------------------------------------------------
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26 |       buildConfiguration = "Debug"
27 |       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
28 |       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
29 |       shouldUseLaunchSchemeArgsEnv = "YES">
30 |       <Testables>
31 |       </Testables>
32 |       <MacroExpansion>
33 |          <BuildableReference
34 |             BuildableIdentifier = "primary"
35 |             BlueprintIdentifier = "83B1877C1BFDBCF80050F8FC"
36 |             BuildableName = "DraggableViewControllerDemo.app"
37 |             BlueprintName = "DraggableViewControllerDemo"
38 |             ReferencedContainer = "container:DraggableViewControllerDemo.xcodeproj">
39 |          </BuildableReference>
40 |       </MacroExpansion>
41 |       <AdditionalOptions>
42 |       </AdditionalOptions>
43 |    </TestAction>
44 |    <LaunchAction
45 |       buildConfiguration = "Debug"
46 |       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
47 |       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
48 |       launchStyle = "0"
49 |       useCustomWorkingDirectory = "NO"
50 |       ignoresPersistentStateOnLaunch = "NO"
51 |       debugDocumentVersioning = "YES"
52 |       debugServiceExtension = "internal"
53 |       allowLocationSimulation = "YES">
54 |       <BuildableProductRunnable
55 |          runnableDebuggingMode = "0">
56 |          <BuildableReference
57 |             BuildableIdentifier = "primary"
58 |             BlueprintIdentifier = "83B1877C1BFDBCF80050F8FC"
59 |             BuildableName = "DraggableViewControllerDemo.app"
60 |             BlueprintName = "DraggableViewControllerDemo"
61 |             ReferencedContainer = "container:DraggableViewControllerDemo.xcodeproj">
62 |          </BuildableReference>
63 |       </BuildableProductRunnable>
64 |       <AdditionalOptions>
65 |       </AdditionalOptions>
66 |    </LaunchAction>
67 |    <ProfileAction
68 |       buildConfiguration = "Release"
69 |       shouldUseLaunchSchemeArgsEnv = "YES"
70 |       savedToolIdentifier = ""
71 |       useCustomWorkingDirectory = "NO"
72 |       debugDocumentVersioning = "YES">
73 |       <BuildableProductRunnable
74 |          runnableDebuggingMode = "0">
75 |          <BuildableReference
76 |             BuildableIdentifier = "primary"
77 |             BlueprintIdentifier = "83B1877C1BFDBCF80050F8FC"
78 |             BuildableName = "DraggableViewControllerDemo.app"
79 |             BlueprintName = "DraggableViewControllerDemo"
80 |             ReferencedContainer = "container:DraggableViewControllerDemo.xcodeproj">
81 |          </BuildableReference>
82 |       </BuildableProductRunnable>
83 |    </ProfileAction>
84 |    <AnalyzeAction
85 |       buildConfiguration = "Debug">
86 |    </AnalyzeAction>
87 |    <ArchiveAction
88 |       buildConfiguration = "Release"
89 |       revealArchiveInOrganizer = "YES">
90 |    </ArchiveAction>
91 | </Scheme>
92 | 


--------------------------------------------------------------------------------
/DraggableViewControllerDemo.xcodeproj/xcuserdata/saiday.xcuserdatad/xcschemes/xcschememanagement.plist:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 3 | <plist version="1.0">
 4 | <dict>
 5 | 	<key>SchemeUserState</key>
 6 | 	<dict>
 7 | 		<key>DraggableViewControllerDemo.xcscheme</key>
 8 | 		<dict>
 9 | 			<key>orderHint</key>
10 | 			<integer>0</integer>
11 | 		</dict>
12 | 	</dict>
13 | 	<key>SuppressBuildableAutocreation</key>
14 | 	<dict>
15 | 		<key>83B1877C1BFDBCF80050F8FC</key>
16 | 		<dict>
17 | 			<key>primary</key>
18 | 			<true/>
19 | 		</dict>
20 | 	</dict>
21 | </dict>
22 | </plist>
23 | 


--------------------------------------------------------------------------------
/DraggableViewControllerDemo/AppDelegate.h:
--------------------------------------------------------------------------------
 1 | //
 2 | //  AppDelegate.h
 3 | //  DraggableViewControllerDemo
 4 | //
 5 | //  Created by saiday on 11/19/15.
 6 | //  Copyright © 2015 saiday. All rights reserved.
 7 | //
 8 | 
 9 | #import <UIKit/UIKit.h>
10 | 
11 | @interface AppDelegate : UIResponder <UIApplicationDelegate>
12 | 
13 | @property (strong, nonatomic) UIWindow *window;
14 | 
15 | 
16 | @end
17 | 
18 | 


--------------------------------------------------------------------------------
/DraggableViewControllerDemo/AppDelegate.m:
--------------------------------------------------------------------------------
 1 | //
 2 | //  AppDelegate.m
 3 | //  DraggableViewControllerDemo
 4 | //
 5 | //  Created by saiday on 11/19/15.
 6 | //  Copyright © 2015 saiday. All rights reserved.
 7 | //
 8 | 
 9 | #import "AppDelegate.h"
10 | 
11 | #import "ViewController.h"
12 | 
13 | @interface AppDelegate ()
14 | 
15 | @end
16 | 
17 | @implementation AppDelegate
18 | 
19 | 
20 | - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
21 |     self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
22 |     [self.window setRootViewController:[[ViewController alloc] init]];
23 |     [self.window makeKeyAndVisible];
24 |     return YES;
25 | }
26 | 
27 | - (void)applicationWillResignActive:(UIApplication *)application {
28 |     // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
29 |     // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
30 | }
31 | 
32 | - (void)applicationDidEnterBackground:(UIApplication *)application {
33 |     // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
34 |     // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
35 | }
36 | 
37 | - (void)applicationWillEnterForeground:(UIApplication *)application {
38 |     // Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
39 | }
40 | 
41 | - (void)applicationDidBecomeActive:(UIApplication *)application {
42 |     // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
43 | }
44 | 
45 | - (void)applicationWillTerminate:(UIApplication *)application {
46 |     // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
47 | }
48 | 
49 | @end
50 | 


--------------------------------------------------------------------------------
/DraggableViewControllerDemo/Assets.xcassets/AppIcon.appiconset/Contents.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "images" : [
 3 |     {
 4 |       "idiom" : "iphone",
 5 |       "size" : "29x29",
 6 |       "scale" : "2x"
 7 |     },
 8 |     {
 9 |       "idiom" : "iphone",
10 |       "size" : "29x29",
11 |       "scale" : "3x"
12 |     },
13 |     {
14 |       "idiom" : "iphone",
15 |       "size" : "40x40",
16 |       "scale" : "2x"
17 |     },
18 |     {
19 |       "idiom" : "iphone",
20 |       "size" : "40x40",
21 |       "scale" : "3x"
22 |     },
23 |     {
24 |       "idiom" : "iphone",
25 |       "size" : "60x60",
26 |       "scale" : "2x"
27 |     },
28 |     {
29 |       "idiom" : "iphone",
30 |       "size" : "60x60",
31 |       "scale" : "3x"
32 |     },
33 |     {
34 |       "idiom" : "ipad",
35 |       "size" : "29x29",
36 |       "scale" : "1x"
37 |     },
38 |     {
39 |       "idiom" : "ipad",
40 |       "size" : "29x29",
41 |       "scale" : "2x"
42 |     },
43 |     {
44 |       "idiom" : "ipad",
45 |       "size" : "40x40",
46 |       "scale" : "1x"
47 |     },
48 |     {
49 |       "idiom" : "ipad",
50 |       "size" : "40x40",
51 |       "scale" : "2x"
52 |     },
53 |     {
54 |       "idiom" : "ipad",
55 |       "size" : "76x76",
56 |       "scale" : "1x"
57 |     },
58 |     {
59 |       "idiom" : "ipad",
60 |       "size" : "76x76",
61 |       "scale" : "2x"
62 |     }
63 |   ],
64 |   "info" : {
65 |     "version" : 1,
66 |     "author" : "xcode"
67 |   }
68 | }


--------------------------------------------------------------------------------
/DraggableViewControllerDemo/Base.lproj/LaunchScreen.storyboard:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 2 | <document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="8150" systemVersion="15A204g" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" initialViewController="01J-lp-oVM">
 3 |     <dependencies>
 4 |         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="8122"/>
 5 |     </dependencies>
 6 |     <scenes>
 7 |         <!--View Controller-->
 8 |         <scene sceneID="EHf-IW-A2E">
 9 |             <objects>
10 |                 <viewController id="01J-lp-oVM" sceneMemberID="viewController">
11 |                     <layoutGuides>
12 |                         <viewControllerLayoutGuide type="top" id="Llm-lL-Icb"/>
13 |                         <viewControllerLayoutGuide type="bottom" id="xb3-aO-Qok"/>
14 |                     </layoutGuides>
15 |                     <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
16 |                         <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
17 |                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
18 |                         <animations/>
19 |                         <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
20 |                     </view>
21 |                 </viewController>
22 |                 <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
23 |             </objects>
24 |             <point key="canvasLocation" x="53" y="375"/>
25 |         </scene>
26 |     </scenes>
27 | </document>
28 | 


--------------------------------------------------------------------------------
/DraggableViewControllerDemo/BaseAnimator.h:
--------------------------------------------------------------------------------
 1 | //
 2 | //  BaseAnimator.h
 3 | //  DraggableViewControllerDemo
 4 | //
 5 | //  Created by saiday on 11/19/15.
 6 | //  Copyright © 2015 saiday. All rights reserved.
 7 | //
 8 | 
 9 | #import <UIKit/UIKit.h>
10 | 
11 | typedef NS_ENUM(NSInteger, ModalAnimatedTransitioningType) {
12 |     ModalAnimatedTransitioningTypePresent,
13 |     ModalAnimatedTransitioningTypeDismiss
14 | };
15 | 
16 | @interface BaseAnimator : NSObject <UIViewControllerAnimatedTransitioning>
17 | 
18 | @property (nonatomic) ModalAnimatedTransitioningType transitionType;
19 | 
20 | - (void)animatePresentingInContext:(id<UIViewControllerContextTransitioning>)transitionContext toVC:(UIViewController *)toVC fromVC:(UIViewController *)fromVC;
21 | - (void)animateDismissingInContext:(id<UIViewControllerContextTransitioning>)transitionContext toVC:(UIViewController *)toVC fromVC:(UIViewController *)fromVC;
22 | 
23 | @end


--------------------------------------------------------------------------------
/DraggableViewControllerDemo/BaseAnimator.m:
--------------------------------------------------------------------------------
 1 | //
 2 | //  BaseAnimator.m
 3 | //  DraggableViewControllerDemo
 4 | //
 5 | //  Created by saiday on 11/19/15.
 6 | //  Copyright © 2015 saiday. All rights reserved.
 7 | //
 8 | 
 9 | #import "BaseAnimator.h"
10 | 
11 | @implementation BaseAnimator
12 | 
13 | - (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext
14 | {
15 |     UIViewController *to = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
16 |     UIViewController *from = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
17 |     
18 |     if (self.transitionType == ModalAnimatedTransitioningTypePresent) {
19 |         [self animatePresentingInContext:transitionContext toVC:to fromVC:from];
20 |     } else if (self.transitionType == ModalAnimatedTransitioningTypeDismiss) {
21 |         [self animateDismissingInContext:transitionContext toVC:to fromVC:from];
22 |     }
23 | }
24 | 
25 | - (NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext
26 | {
27 |     // mustOverride()
28 |     // mustOverride() is a marco took from stackoverflow Yar's answer, or you can use nicklockwood's solution MustOverride GitHub. You can left it blank as well, what mustOverride() does is throw an exception when we forget override the method in subclass.
29 |     // http://stackoverflow.com/questions/1034373/creating-an-abstract-class-in-objective-c/6448761#6448761
30 |     
31 |     @throw [NSException exceptionWithName:NSInvalidArgumentException reason:[NSString stringWithFormat:@"%s must be overridden in a subclass/category", __PRETTY_FUNCTION__] userInfo:nil];
32 | }
33 | 
34 | - (void)animatePresentingInContext:(id<UIViewControllerContextTransitioning>)transitionContext toVC:(UIViewController *)toVC fromVC:(UIViewController *)fromVC
35 | {
36 |     @throw [NSException exceptionWithName:NSInvalidArgumentException reason:[NSString stringWithFormat:@"%s must be overridden in a subclass/category", __PRETTY_FUNCTION__] userInfo:nil];
37 | }
38 | 
39 | - (void)animateDismissingInContext:(id<UIViewControllerContextTransitioning>)transitionContext toVC:(UIViewController *)toVC fromVC:(UIViewController *)fromVC
40 | {
41 |     @throw [NSException exceptionWithName:NSInvalidArgumentException reason:[NSString stringWithFormat:@"%s must be overridden in a subclass/category", __PRETTY_FUNCTION__] userInfo:nil];
42 | }
43 | 
44 | @end


--------------------------------------------------------------------------------
/DraggableViewControllerDemo/DummyView.h:
--------------------------------------------------------------------------------
 1 | //
 2 | //  DummyView.h
 3 | //  DraggableViewControllerDemo
 4 | //
 5 | //  Created by saiday on 11/19/15.
 6 | //  Copyright © 2015 saiday. All rights reserved.
 7 | //
 8 | 
 9 | #import <UIKit/UIKit.h>
10 | 
11 | @interface DummyView : UIView
12 | 
13 | @property (nonatomic, weak) UIButton *button;
14 | 
15 | @end
16 | 


--------------------------------------------------------------------------------
/DraggableViewControllerDemo/DummyView.m:
--------------------------------------------------------------------------------
 1 | //
 2 | //  DummyView.m
 3 | //  DraggableViewControllerDemo
 4 | //
 5 | //  Created by saiday on 11/19/15.
 6 | //  Copyright © 2015 saiday. All rights reserved.
 7 | //
 8 | 
 9 | #import "DummyView.h"
10 | 
11 | @implementation DummyView
12 | 
13 | - (instancetype)initWithFrame:(CGRect)frame
14 | {
15 |     self = [super initWithFrame:frame];
16 |     if (self) {
17 |         [self setupSubview];
18 |     }
19 |     
20 |     return self;
21 | }
22 | 
23 | - (void)setupSubview
24 | {
25 |     UIButton *bottomButton = [UIButton buttonWithType:UIButtonTypeCustom];
26 |     bottomButton.translatesAutoresizingMaskIntoConstraints = NO;
27 |     bottomButton.backgroundColor = [UIColor grayColor];
28 |     [bottomButton setTitle:@"Tap or drag me" forState:UIControlStateNormal];
29 |     [self addSubview:bottomButton];
30 |     [self addConstraint:[NSLayoutConstraint constraintWithItem:bottomButton attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:bottomButton.superview attribute:NSLayoutAttributeTop multiplier:1.0 constant:0]];
31 |     [self addConstraint:[NSLayoutConstraint constraintWithItem:bottomButton attribute:NSLayoutAttributeRight relatedBy:NSLayoutRelationEqual toItem:bottomButton.superview attribute:NSLayoutAttributeRight multiplier:1.0 constant:0]];
32 |     [self addConstraint:[NSLayoutConstraint constraintWithItem:bottomButton attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:bottomButton.superview attribute:NSLayoutAttributeBottom multiplier:1.0 constant:0]];
33 |     [self addConstraint:[NSLayoutConstraint constraintWithItem:bottomButton attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationEqual toItem:bottomButton.superview attribute:NSLayoutAttributeLeft multiplier:1.0 constant:0]];
34 | 
35 |     self.button = bottomButton;
36 | }
37 | 
38 | @end
39 | 


--------------------------------------------------------------------------------
/DraggableViewControllerDemo/Info.plist:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 3 | <plist version="1.0">
 4 | <dict>
 5 | 	<key>CFBundleDevelopmentRegion</key>
 6 | 	<string>en</string>
 7 | 	<key>CFBundleExecutable</key>
 8 | 	<string>$(EXECUTABLE_NAME)</string>
 9 | 	<key>CFBundleIdentifier</key>
10 | 	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
11 | 	<key>CFBundleInfoDictionaryVersion</key>
12 | 	<string>6.0</string>
13 | 	<key>CFBundleName</key>
14 | 	<string>$(PRODUCT_NAME)</string>
15 | 	<key>CFBundlePackageType</key>
16 | 	<string>APPL</string>
17 | 	<key>CFBundleShortVersionString</key>
18 | 	<string>1.0</string>
19 | 	<key>CFBundleSignature</key>
20 | 	<string>????</string>
21 | 	<key>CFBundleVersion</key>
22 | 	<string>1</string>
23 | 	<key>LSRequiresIPhoneOS</key>
24 | 	<true/>
25 | 	<key>UILaunchStoryboardName</key>
26 | 	<string>LaunchScreen</string>
27 | 	<key>UIRequiredDeviceCapabilities</key>
28 | 	<array>
29 | 		<string>armv7</string>
30 | 	</array>
31 | 	<key>UISupportedInterfaceOrientations</key>
32 | 	<array>
33 | 		<string>UIInterfaceOrientationPortrait</string>
34 | 		<string>UIInterfaceOrientationLandscapeLeft</string>
35 | 		<string>UIInterfaceOrientationLandscapeRight</string>
36 | 	</array>
37 | 	<key>UISupportedInterfaceOrientations~ipad</key>
38 | 	<array>
39 | 		<string>UIInterfaceOrientationPortrait</string>
40 | 		<string>UIInterfaceOrientationPortraitUpsideDown</string>
41 | 		<string>UIInterfaceOrientationLandscapeLeft</string>
42 | 		<string>UIInterfaceOrientationLandscapeRight</string>
43 | 	</array>
44 | </dict>
45 | </plist>
46 | 


--------------------------------------------------------------------------------
/DraggableViewControllerDemo/MiniToLargeViewAnimator.h:
--------------------------------------------------------------------------------
 1 | //
 2 | //  MiniToLargeViewAnimator.h
 3 | //  DraggableViewControllerDemo
 4 | //
 5 | //  Created by saiday on 11/19/15.
 6 | //  Copyright © 2015 saiday. All rights reserved.
 7 | //
 8 | 
 9 | #import "BaseAnimator.h"
10 | 
11 | @interface MiniToLargeViewAnimator : BaseAnimator
12 | 
13 | @property (nonatomic) CGFloat initialY;
14 | 
15 | @end
16 | 


--------------------------------------------------------------------------------
/DraggableViewControllerDemo/MiniToLargeViewAnimator.m:
--------------------------------------------------------------------------------
 1 | //
 2 | //  MiniToLargeViewAnimator.m
 3 | //  DraggableViewControllerDemo
 4 | //
 5 | //  Created by saiday on 11/19/15.
 6 | //  Copyright © 2015 saiday. All rights reserved.
 7 | //
 8 | 
 9 | #import "MiniToLargeViewAnimator.h"
10 | 
11 | #import "DummyView.h"
12 | 
13 | static NSTimeInterval kAnimationDuration = .4f;
14 | 
15 | @implementation MiniToLargeViewAnimator
16 | 
17 | - (NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext
18 | {
19 |     return kAnimationDuration;
20 | }
21 | 
22 | - (void)animatePresentingInContext:(id<UIViewControllerContextTransitioning>)transitionContext toVC:(UIViewController *)toVC fromVC:(UIViewController *)fromVC
23 | {
24 |     CGRect fromVCRect = [transitionContext initialFrameForViewController:fromVC];
25 |     CGRect toVCRect = fromVCRect;
26 |     toVCRect.origin.y = toVCRect.size.height - self.initialY;
27 |     
28 |     toVC.view.frame = toVCRect;
29 |     UIView *container = [transitionContext containerView];
30 |     UIView *imageView = [self fakeMiniView];
31 |     [toVC.view addSubview:imageView];
32 |     [container addSubview:fromVC.view];
33 |     [container addSubview:toVC.view];
34 |     
35 |     [UIView animateWithDuration:kAnimationDuration animations:^{
36 |         toVC.view.frame = fromVCRect;
37 |         imageView.alpha = 0.f;
38 |     } completion:^(BOOL finished) {
39 |         [imageView removeFromSuperview];
40 |         if ([transitionContext transitionWasCancelled]) {
41 |             [transitionContext completeTransition:NO];
42 |         } else {
43 |             [transitionContext completeTransition:YES];
44 |         }
45 |     }];
46 | }
47 | 
48 | - (void)animateDismissingInContext:(id<UIViewControllerContextTransitioning>)transitionContext toVC:(UIViewController *)toVC fromVC:(UIViewController *)fromVC
49 | {
50 |     CGRect fromVCRect = [transitionContext initialFrameForViewController:fromVC];
51 |     fromVCRect.origin.y = fromVCRect.size.height - self.initialY;
52 |     
53 |     UIView *imageView = [self fakeMiniView];
54 |     [fromVC.view addSubview:imageView];
55 |     UIView *container = [transitionContext containerView];
56 |     [container addSubview:toVC.view];
57 |     [container addSubview:fromVC.view];
58 |     imageView.alpha = 0.f;
59 |     
60 |     [UIView animateWithDuration:kAnimationDuration animations:^{
61 |         fromVC.view.frame = fromVCRect;
62 |         imageView.alpha = 1.f;
63 |     } completion:^(BOOL finished) {
64 |         [imageView removeFromSuperview];
65 |         if ([transitionContext transitionWasCancelled]) {
66 |             [transitionContext completeTransition:NO];
67 |             [toVC.view removeFromSuperview];
68 |         } else {
69 |             [transitionContext completeTransition:YES];
70 |         }
71 |     }];
72 | }
73 | 
74 | - (UIView *)fakeMiniView
75 | {
76 |     // Fake a mini view, two ways:
77 |     // 1. create a new certain one
78 |     // 2. snapshot old one.
79 |     
80 |     DummyView *dummyView = [[DummyView alloc] initWithFrame:CGRectMake(0.f, 0.f, [[UIScreen mainScreen] bounds].size.width, 50.f)];
81 |     return dummyView;
82 | }
83 | 
84 | @end
85 | 


--------------------------------------------------------------------------------
/DraggableViewControllerDemo/MiniToLargeViewInteractive.h:
--------------------------------------------------------------------------------
 1 | //
 2 | //  MiniToLargeViewInteractive.h
 3 | //  DraggableViewControllerDemo
 4 | //
 5 | //  Created by saiday on 11/19/15.
 6 | //  Copyright © 2015 saiday. All rights reserved.
 7 | //
 8 | 
 9 | #import <UIKit/UIKit.h>
10 | 
11 | @interface MiniToLargeViewInteractive : UIPercentDrivenInteractiveTransition
12 | 
13 | @property (nonatomic) UIViewController *viewController;
14 | @property (nonatomic) UIViewController *presentViewController;
15 | @property (nonatomic) UIPanGestureRecognizer *pan;
16 | 
17 | - (void)attachToViewController:(UIViewController *)viewController withView:(UIView *)view presentViewController:(UIViewController *)presentViewController;
18 | 
19 | @end


--------------------------------------------------------------------------------
/DraggableViewControllerDemo/MiniToLargeViewInteractive.m:
--------------------------------------------------------------------------------
 1 | //
 2 | //  MiniToLargeViewInteractive.m
 3 | //  DraggableViewControllerDemo
 4 | //
 5 | //  Created by saiday on 11/19/15.
 6 | //  Copyright © 2015 saiday. All rights reserved.
 7 | //
 8 | 
 9 | #import "MiniToLargeViewInteractive.h"
10 | 
11 | @interface MiniToLargeViewInteractive ()
12 | 
13 | @property (nonatomic) BOOL shouldComplete;
14 | 
15 | @end
16 | 
17 | @implementation MiniToLargeViewInteractive
18 | 
19 | - (void)attachToViewController:(UIViewController *)viewController withView:(UIView *)view presentViewController:(UIViewController *)presentViewController
20 | {
21 |     self.viewController = viewController;
22 |     self.presentViewController = presentViewController;
23 |     self.pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(onPan:)];
24 |     [view addGestureRecognizer:self.pan];
25 | }
26 | 
27 | - (void)onPan:(UIPanGestureRecognizer *)pan
28 | {
29 |     CGPoint translation = [pan translationInView:pan.view.superview];
30 |     
31 |     switch (pan.state) {
32 |         case UIGestureRecognizerStateBegan:
33 |             if (!self.presentViewController) {
34 |                 [self.viewController dismissViewControllerAnimated:YES completion:nil];
35 |             } else {
36 |                 [self.viewController presentViewController:self.presentViewController animated:YES completion:nil];
37 |             }
38 |             break;
39 |             
40 |         case UIGestureRecognizerStateChanged:
41 |         {
42 |             const CGFloat screenHeight = [UIScreen mainScreen].bounds.size.height - 50.f;
43 |             const CGFloat DragAmount = !self.presentViewController ? screenHeight : - screenHeight;
44 |             const CGFloat Threshold = .3f;
45 |             CGFloat percent = translation.y / DragAmount;
46 |             
47 |             percent = fmaxf(percent, 0.f);
48 |             percent = fminf(percent, 1.f);
49 |             [self updateInteractiveTransition:percent];
50 |             
51 |             self.shouldComplete = percent > Threshold;
52 |         }
53 |             break;
54 |             
55 |         case UIGestureRecognizerStateEnded:
56 |         case UIGestureRecognizerStateCancelled:
57 |         {
58 |             if (pan.state == UIGestureRecognizerStateCancelled || !self.shouldComplete) {
59 |                 [self cancelInteractiveTransition];
60 |             } else {
61 |                 [self finishInteractiveTransition];
62 |             }
63 |         }
64 |             break;
65 |         default:
66 |             break;
67 |     }
68 | }
69 | 
70 | - (CGFloat)completionSpeed
71 | {
72 |     return 1.f - self.percentComplete;
73 | }
74 | 
75 | @end


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/DraggableViewControllerDemo/NextViewController.h:
--------------------------------------------------------------------------------
 1 | //
 2 | //  NewViewController.h
 3 | //  DraggableViewControllerDemo
 4 | //
 5 | //  Created by saiday on 11/19/15.
 6 | //  Copyright © 2015 saiday. All rights reserved.
 7 | //
 8 | 
 9 | #import <UIKit/UIKit.h>
10 | 
11 | #import "ViewController.h"
12 | 
13 | @interface NextViewController : UIViewController
14 | 
15 | @property (nonatomic, weak) ViewController *rootViewController;
16 | 
17 | @end
18 | 


--------------------------------------------------------------------------------
/DraggableViewControllerDemo/NextViewController.m:
--------------------------------------------------------------------------------
 1 | //
 2 | //  NewViewController.m
 3 | //  DraggableViewControllerDemo
 4 | //
 5 | //  Created by saiday on 11/19/15.
 6 | //  Copyright © 2015 saiday. All rights reserved.
 7 | //
 8 | 
 9 | #import "NextViewController.h"
10 | 
11 | @interface NextViewController ()
12 | 
13 | @property (nonatomic, weak) UIButton *bottomButton;
14 | 
15 | @end
16 | 
17 | @implementation NextViewController
18 | 
19 | - (void)viewDidLoad {
20 |     [super viewDidLoad];
21 |     
22 |     self.view.backgroundColor = [UIColor yellowColor];
23 |     
24 |     UIButton *dismissButton = [UIButton buttonWithType:UIButtonTypeCustom];
25 |     dismissButton.translatesAutoresizingMaskIntoConstraints = NO;
26 |     dismissButton.backgroundColor = [UIColor grayColor];
27 |     [dismissButton setTitle:@"Dismiss" forState:UIControlStateNormal];
28 |     [dismissButton addTarget:self action:@selector(bottomButtonTapped) forControlEvents:UIControlEventTouchUpInside];
29 |     [self.view addSubview:dismissButton];
30 |     [self.view addConstraint:[NSLayoutConstraint constraintWithItem:dismissButton attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeCenterX multiplier:1.0 constant:0.f]];
31 |     [self.view addConstraint:[NSLayoutConstraint constraintWithItem:dismissButton attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeCenterY multiplier:1.0 constant:0.f]];
32 | 
33 |     self.bottomButton = dismissButton;
34 | }
35 | 
36 | - (void)bottomButtonTapped
37 | {
38 |     self.rootViewController.disableInteractivePlayerTransitioning = YES;
39 |     __weak typeof(self) weakSelf = self;
40 |     [self dismissViewControllerAnimated:YES completion:^{
41 |         weakSelf.rootViewController.disableInteractivePlayerTransitioning = NO;
42 |     }];
43 | }
44 | 
45 | 
46 | @end
47 | 


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/DraggableViewControllerDemo/ViewController.h:
--------------------------------------------------------------------------------
 1 | //
 2 | //  ViewController.h
 3 | //  DraggableViewControllerDemo
 4 | //
 5 | //  Created by saiday on 11/19/15.
 6 | //  Copyright © 2015 saiday. All rights reserved.
 7 | //
 8 | 
 9 | #import <UIKit/UIKit.h>
10 | 
11 | @interface ViewController : UIViewController
12 | 
13 | @property (nonatomic) BOOL disableInteractivePlayerTransitioning;
14 | 
15 | @end
16 | 
17 | 


--------------------------------------------------------------------------------
/DraggableViewControllerDemo/ViewController.m:
--------------------------------------------------------------------------------
 1 | //
 2 | //  ViewController.m
 3 | //  DraggableViewControllerDemo
 4 | //
 5 | //  Created by saiday on 11/19/15.
 6 | //  Copyright © 2015 saiday. All rights reserved.
 7 | //
 8 | 
 9 | #import "ViewController.h"
10 | 
11 | #import "DummyView.h"
12 | #import "NextViewController.h"
13 | #import "MiniToLargeViewAnimator.h"
14 | #import "MiniToLargeViewInteractive.h"
15 | 
16 | static CGFloat kButtonHeight = 50.f;
17 | 
18 | @interface ViewController () <UIViewControllerTransitioningDelegate>
19 | 
20 | @property (nonatomic) NextViewController *nextViewController;
21 | @property (nonatomic) MiniToLargeViewInteractive *presentInteractor;
22 | @property (nonatomic) MiniToLargeViewInteractive *dismissInteractor;
23 | 
24 | @property (nonatomic, weak) UIView *dummyView;
25 | 
26 | @end
27 | 
28 | @implementation ViewController
29 | 
30 | - (void)viewDidLoad {
31 |     [super viewDidLoad];
32 |     
33 |     DummyView *dummyView = [[DummyView alloc] init];
34 |     dummyView.translatesAutoresizingMaskIntoConstraints = NO;
35 |     [dummyView.button addTarget:self action:@selector(bottomButtonTapped) forControlEvents:UIControlEventTouchUpInside];
36 |     [self.view addSubview:dummyView];
37 |     [dummyView addConstraint:[NSLayoutConstraint constraintWithItem:dummyView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.f constant:kButtonHeight]];
38 |     [self.view addConstraint:[NSLayoutConstraint constraintWithItem:dummyView attribute:NSLayoutAttributeRight relatedBy:NSLayoutRelationEqual toItem:dummyView.superview attribute:NSLayoutAttributeRight multiplier:1.0 constant:0]];
39 |     [self.view addConstraint:[NSLayoutConstraint constraintWithItem:dummyView attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:dummyView.superview attribute:NSLayoutAttributeBottom multiplier:1.0 constant:0]];
40 |     [self.view addConstraint:[NSLayoutConstraint constraintWithItem:dummyView attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationEqual toItem:dummyView.superview attribute:NSLayoutAttributeLeft multiplier:1.0 constant:0]];
41 |     self.dummyView = dummyView;
42 |     
43 |     self.nextViewController = [[NextViewController alloc] init];
44 |     self.nextViewController.rootViewController = self;
45 |     self.nextViewController.transitioningDelegate = self;
46 |     self.nextViewController.modalTransitionStyle = UIModalPresentationCustom;
47 |     self.nextViewController.modalPresentationStyle = UIModalPresentationFullScreen;
48 |     
49 |     self.presentInteractor = [[MiniToLargeViewInteractive alloc] init];
50 |     [self.presentInteractor attachToViewController:self withView:dummyView presentViewController:self.nextViewController];
51 |     self.dismissInteractor = [[MiniToLargeViewInteractive alloc] init];
52 |     [self.dismissInteractor attachToViewController:self.nextViewController withView:self.nextViewController.view presentViewController:nil];
53 | }
54 | 
55 | - (void)bottomButtonTapped
56 | {
57 |     self.disableInteractivePlayerTransitioning = YES;
58 |     [self presentViewController:self.nextViewController animated:YES completion:^{
59 |         self.disableInteractivePlayerTransitioning = NO;
60 |     }];
61 | }
62 | 
63 | - (id<UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed
64 | {
65 |     MiniToLargeViewAnimator *animator = [[MiniToLargeViewAnimator alloc] init];
66 |     animator.initialY = kButtonHeight;
67 |     animator.transitionType = ModalAnimatedTransitioningTypeDismiss;
68 |     return animator;
69 | }
70 | 
71 | - (id<UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source
72 | {
73 |     MiniToLargeViewAnimator *animator = [[MiniToLargeViewAnimator alloc] init];
74 |     animator.initialY = kButtonHeight;
75 |     animator.transitionType = ModalAnimatedTransitioningTypePresent;
76 |     return animator;
77 | }
78 | 
79 | - (id<UIViewControllerInteractiveTransitioning>)interactionControllerForPresentation:(id<UIViewControllerAnimatedTransitioning>)animator
80 | {
81 |     if (self.disableInteractivePlayerTransitioning) {
82 |         return nil;
83 |     }
84 |     return self.presentInteractor;
85 | }
86 | 
87 | - (id<UIViewControllerInteractiveTransitioning>)interactionControllerForDismissal:(id<UIViewControllerAnimatedTransitioning>)animator
88 | {
89 |     if (self.disableInteractivePlayerTransitioning) {
90 |         return nil;
91 |     }
92 |     return self.dismissInteractor;
93 | }
94 | 
95 | @end
96 | 


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/DraggableViewControllerDemo/main.m:
--------------------------------------------------------------------------------
 1 | //
 2 | //  main.m
 3 | //  DraggableViewControllerDemo
 4 | //
 5 | //  Created by saiday on 11/19/15.
 6 | //  Copyright © 2015 saiday. All rights reserved.
 7 | //
 8 | 
 9 | #import <UIKit/UIKit.h>
10 | #import "AppDelegate.h"
11 | 
12 | int main(int argc, char * argv[]) {
13 |     @autoreleasepool {
14 |         return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
15 |     }
16 | }
17 | 


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/README.md:
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1 | This is a demo project for my blog post [Draggable view controller? Interactive view controller!](http://imnotyourson.com/draggable-view-controller-interactive-view-controller/)
2 | 
3 | If you'd prefer Swift version, here you go: [Swift version](https://github.com/ostatnicky/DraggableViewController) made by [ostathnicky](https://github.com/ostatnicky/)
4 | 
5 | ![](draggable_view_controller-1.gif)
6 | 


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/draggable_view_controller-1.gif:
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https://raw.githubusercontent.com/saiday/DraggableViewControllerDemo/7a61b3b1a00816df123ac2133e2f254d8d738d8c/draggable_view_controller-1.gif


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