├── LICENSE ├── Package.swift ├── README.md ├── Sources └── ConditionalSwiftUI │ └── ConditionalSwiftUI.swift ├── Tests └── ConditionalSwiftUITests │ └── ConditionalSwiftUITests.swift └── thumbnail.png /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. Definitions. 8 | 9 | "License" shall mean the terms and conditions for use, reproduction, 10 | and distribution as defined by Sections 1 through 9 of this document. 11 | 12 | "Licensor" shall mean the copyright owner or entity authorized by 13 | the copyright owner that is granting the License. 14 | 15 | "Legal Entity" shall mean the union of the acting entity and all 16 | other entities that control, are controlled by, or are under common 17 | control with that entity. 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We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright [yyyy] [name of copyright owner] 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | -------------------------------------------------------------------------------- /Package.swift: -------------------------------------------------------------------------------- 1 | // swift-tools-version: 5.7 2 | // The swift-tools-version declares the minimum version of Swift required to build this package. 3 | 4 | import PackageDescription 5 | 6 | let package = Package( 7 | name: "ConditionalSwiftUI", 8 | products: [ 9 | // Products define the executables and libraries a package produces, and make them visible to other packages. 10 | .library( 11 | name: "ConditionalSwiftUI", 12 | targets: ["ConditionalSwiftUI"]), 13 | ], 14 | dependencies: [ 15 | // Dependencies declare other packages that this package depends on. 16 | // .package(url: /* package url */, from: "1.0.0"), 17 | ], 18 | targets: [ 19 | // Targets are the basic building blocks of a package. A target can define a module or a test suite. 20 | // Targets can depend on other targets in this package, and on products in packages this package depends on. 21 | .target( 22 | name: "ConditionalSwiftUI", 23 | dependencies: []), 24 | .testTarget( 25 | name: "ConditionalSwiftUITests", 26 | dependencies: ["ConditionalSwiftUI"]), 27 | ] 28 | ) 29 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | ![Thumbnail](./thumbnail.png) 2 | # ConditionalSwiftUI 3 | A Library that makes SwiftUI conditional statements easy 4 | 5 | ## Usage 6 | 7 | ### .if 8 | This method applies the given transform if the given condition evaluates to true. 9 | ```swift 10 | Text("Hello, World!") 11 | .if(someCondition) { view in 12 | view 13 | .foregroundColor(.red) 14 | .background(Color.yellow) 15 | } 16 | ``` 17 | 18 | ### if with else 19 | same with `.if` but with `else` 20 | ```swift 21 | Text("Hello, World!") 22 | .if(someCondition) { view in 23 | view 24 | .foregroundColor(.red) 25 | .background(Color.yellow) 26 | }, else: { view in 27 | view 28 | .foregroundColor(.blue) 29 | } 30 | ``` 31 | 32 | ### ifLet 33 | same with if, but it takes an optional value instead of a boolean and unwraps it 34 | 35 | ```swift 36 | struct ContentView: View { 37 | @State private var color: Color? = nil 38 | 39 | var body: some View { 40 | Text("Hello World") 41 | .ifLet(color) { color, view in 42 | view 43 | .foregroundColor(color) 44 | } 45 | } 46 | } 47 | ``` 48 | 49 | ### ifLet with else 50 | same with `.ifLet` but with `else` 51 | 52 | ```swift 53 | struct ContentView: View { 54 | @State private var color: Color? = nil 55 | 56 | var body: some View { 57 | Text("Hello World") 58 | .ifLet(color) { color, view in 59 | view 60 | .foregroundColor(color) 61 | }, else: { view in 62 | view 63 | .foregroundColor(.red) 64 | } 65 | } 66 | } 67 | ``` 68 | ### extractView 69 | this method extracts the view like in the `.if` statement, especially useful when using `if #available()` statement 70 | 71 | ```swift 72 | Toggle("I'm a conditionally modified Toggle!", isOn: .constant(true)) 73 | .extractView { view in 74 | Group { 75 | if #available(iOS 15.0, *) { 76 | view 77 | .tint(.indigo) 78 | } 79 | else { 80 | view 81 | .toggleStyle(SwitchToggleStyle(tint: .init(.systemIndigo))) 82 | } 83 | } 84 | } 85 | ``` 86 | 87 | ### Implementation, and its drawbacks 88 | This implementaion is not new, and it's been used widely for the time being, but be aware that it could cause you some trouble with animations, as described in this [article](https://www.objc.io/blog/2021/08/24/conditional-view-modifiers/), so be cautious about it when using this library. 89 | -------------------------------------------------------------------------------- /Sources/ConditionalSwiftUI/ConditionalSwiftUI.swift: -------------------------------------------------------------------------------- 1 | // 2 | // ConditionalSwiftUI.swift 3 | // ConditionalViewModifiers 4 | // 5 | // Created by GrandSir on 19.04.2023. 6 | // 7 | 8 | import SwiftUI 9 | 10 | @available(iOS 13.0, *) 11 | public extension View { 12 | /// Applies the given transform if the given condition evaluates to `true`. 13 | /// - Parameters: 14 | /// - condition: The condition to evaluate. 15 | /// - transform: The transform to apply to the source `View`. 16 | /// - Returns: Either the original `View` or the modified `View` if the condition is `true`. 17 | @ViewBuilder 18 | func `if`(_ condition: Bool, transform: (Self) -> Content) -> some View { 19 | if condition { 20 | transform(self) 21 | } else { 22 | self 23 | } 24 | } 25 | 26 | /// Applies the given transform `transform` or `else`. 27 | /// - Parameters: 28 | /// - condition: The condition to evaluate. 29 | /// - transform: The transform to apply to the source `View`. 30 | /// - else: The transform that applies if `condition` is false 31 | /// - Returns: Either the original `View` or the modified `View` based on the condition`. 32 | @ViewBuilder 33 | func `if`(_ condition: Bool, transform: (Self) -> Content, @ViewBuilder else: (Self) -> Content) -> some View { 34 | if condition { 35 | transform(self) 36 | } else { 37 | `else`(self) 38 | } 39 | } 40 | 41 | /// Unwraps the given `value` and applies the given `transform`. 42 | /// - Parameters: 43 | /// - value: The value to unwrap. 44 | /// - transform: The transform to apply to the source `View`. 45 | /// - Returns: Either the original `View` or the modified `View` with unwrapped `value` if the `value` is not nil`. 46 | @ViewBuilder 47 | func ifLet(_ value: Value?, @ViewBuilder transform: (Value, Self) -> Content) -> some View { 48 | if let value = value { 49 | transform(value, self) 50 | } else { 51 | self 52 | } 53 | } 54 | 55 | /// Unwraps the given `value` and applies the given `transform`. 56 | /// - Parameters: 57 | /// - value: The value to unwrap. 58 | /// - transform: The transform to apply to the source `View`. 59 | /// - else:The transform that applies if `value` is nil 60 | /// - Returns: Either the `else` transform or the modified `View` with unwrapped `value` if the `value` is not nil`. 61 | @ViewBuilder 62 | func ifLet(_ value: Value?, @ViewBuilder transform: (Value, Self) -> Content, @ViewBuilder else: (Self) -> Content) -> some View { 63 | if let value = value { 64 | transform(value, self) 65 | } else { 66 | `else`(self) 67 | } 68 | } 69 | 70 | /// Applies given transform to the view. 71 | /// - Parameters: 72 | /// - transform: The transform to apply to the source `View`. 73 | /// - Returns: Original `View`. 74 | @ViewBuilder 75 | func extractView(transform: (Self) -> Content) -> some View { 76 | transform(self) 77 | } 78 | } 79 | -------------------------------------------------------------------------------- /Tests/ConditionalSwiftUITests/ConditionalSwiftUITests.swift: -------------------------------------------------------------------------------- 1 | import XCTest 2 | @testable import ConditionalSwiftUI 3 | 4 | final class ConditionalSwiftUITests: XCTestCase { 5 | func testExample() throws { 6 | // This is an example of a functional test case. 7 | // Use XCTAssert and related functions to verify your tests produce the correct 8 | // results. 9 | } 10 | } 11 | -------------------------------------------------------------------------------- /thumbnail.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/grandsir/ConditionalSwiftUI/5486c04662af39a490546b8938d5057ee2331ba0/thumbnail.png --------------------------------------------------------------------------------