• 在SwiftUI中, 你可以將任意的改變過程封裝進(jìn)一個(gè)withAnimation塊中. 默認(rèn), SwiftUI會(huì)對(duì)這種改變采用fade in/out的方式進(jìn)行動(dòng)畫.

效果:

animation.gif

實(shí)例代碼:

import SwiftUI

struct AnimationView: View {
    
    @State private var showDetail = false
    
    var body: some View {
        Button(action: {
            withAnimation {
                self.showDetail = !self.showDetail
            }
        }) {
            Image(systemName: "chevron.right.circle")
                .imageScale(.large)
                .rotationEffect(.degrees(showDetail ? 90 : 0))
                .scaleEffect(showDetail ? 1.5 : 1)
                .padding()
        }
    }
}

struct AnimationView_Previews: PreviewProvider {
    static var previews: some View {
        AnimationView()
    }
}

替換SceneDelegate的根視圖

let contentView = AnimationView()