AnyTransition/过渡动画, MatchedGeometryEffect/匹配几何动画效果 的使用

1. AnyTransition 过渡动画效果

  1.1 创建过度动画案例 AnyTransitionBootcamp.swift

import SwiftUI/// 旋转修饰 View
struct RotateViewModifier :ViewModifier{let rotation: Doublefunc body(content: Content) -> some View {content.rotationEffect(Angle(degrees: rotation)).offset(x: rotation != 0 ? UIScreen.main.bounds.width : 0,y: rotation != 0 ? UIScreen.main.bounds.height : 0)}
}// 扩展
extension AnyTransition{/// 旋转static var rotation: AnyTransition{modifier(active: RotateViewModifier(rotation: 180),identity: RotateViewModifier(rotation: 0))}/// 旋转自定义角度static func rotation(rotation: Double) -> AnyTransition{modifier(active: RotateViewModifier(rotation: rotation),identity: RotateViewModifier(rotation: 0))}/// 旋转 不对称方式static var rotateOn: AnyTransition{asymmetric(insertion: .rotation,removal: .move(edge: .leading))}
}/// 过渡动画
struct AnyTransitionBootcamp: View {@State private var showRectangle: Bool = falsevar body: some View {VStack {Spacer()if showRectangle {RoundedRectangle(cornerRadius: 25).fill(Color.black).frame(width: 250, height: 350).frame(maxWidth: .infinity, maxHeight: .infinity)//.transition(.move(edge: .leading))//.transition(AnyTransition.scale.animation(.easeInOut))//.transition(AnyTransition.rotation.animation(.easeInOut))// 旋转//.transition(.rotation)// 旋转自定义角度//.transition(.rotation(rotation: 1080))// 不对称旋转.transition(.rotateOn)}Spacer()Text("Click Me!").withDefaultButtonFormatting().padding(.horizontal, 40).onTapGesture {//duration: 5.0withAnimation(.easeInOut) {showRectangle.toggle()}}}}
}struct AnyTransitionBootcamp_Previews: PreviewProvider {static var previews: some View {AnyTransitionBootcamp()}
}

  1.2 效果图:

2. MatchedGeometryEffect 匹配几何动画效果

  2.1 创建匹配几何效果案例，MatchedGeometryEffectBootcamp.swift

import SwiftUI/// 匹配几何效果
struct MatchedGeometryEffectBootcamp: View {/// 是否单击@State private var isClicked: Bool = false@Namespace private var namespacevar body: some View {VStack {if !isClicked {Circle().matchedGeometryEffect(id: "rectangle", in: namespace).frame(width: 100, height: 100)}Spacer()if isClicked {Circle().matchedGeometryEffect(id: "rectangle", in: namespace).frame(width: 300, height: 200)}}.frame(maxWidth: .infinity, maxHeight: .infinity).background(Color.orange).onTapGesture {withAnimation(.easeIn(duration: 0.5)) {isClicked.toggle()}}}
}/// 匹配几何效果二
struct MatchedGeometryEffectBootcamp2: View{let categories: [String] = ["Home", "Popular", "Saved"]@State private var selected: String = "Home"@Namespace private var namespace2var body: some View{HStack {ForEach(categories, id: \.self) { category inZStack(alignment: .bottom) {if selected == category{RoundedRectangle(cornerRadius: 10).fill(Color.red.opacity(0.5)).matchedGeometryEffect(id: "category_background", in: namespace2).frame(width: 35, height: 2).offset(y: 10)}Text(category).foregroundColor(selected == category ? .red : .black)}.frame(maxWidth: .infinity).frame(height: 55).onTapGesture {withAnimation(.spring()) {selected = category}}}}.padding()}
}struct MatchedGeometryEffectBootcamp_Previews: PreviewProvider {static var previews: some View {MatchedGeometryEffectBootcamp()//MatchedGeometryEffectBootcamp2()}
}

  2.2 效果图: