我要寻找的行为是长按一个小图像,它会变大,但是释放时,它应该又变小了。
我能够成功完成此行为;但是,我遇到的问题是,按住不放后,我将手指从图像上滑开,因此我可以放大查看它,但被检测为拖动手势,这取消了我的行为。
这是我的代码
import SwiftUI
struct ContentView: View {
@GestureState private var isPressingDown: Bool = false
@State private var width: CGFloat = 64
@State private var height: CGFloat = 64
var body: some View {
let longPress = LongPressGesture(minimumDuration: 0.2)
let infiniteLongPress = LongPressGesture(minimumDuration: .infinity)
let seq = longPress.sequenced(before: infiniteLongPress)
let upd = seq.updating($isPressingDown) { value, state, transaction in
switch value {
case .second(true, nil):
state = true
default:
break
}
}
return ZStack{
Color.black
.opacity(self.isPressingDown ? 0.5 : 0)
.edgesIgnoringSafeArea(.all)
.animation(.spring())
Image("icon")
.resizable()
.frame(width:self.isPressingDown ? self.width * 5 : self.width, height:self.isPressingDown ? self.height * 5 : self.height, alignment:.center)
.gesture(upd)
.cornerRadius(10)
.animation(.spring(dampingFraction: 0.65))
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
改为将拖动手势用作第二个手势。经过测试并可以在Xcode 11.2上使用]
...
let longPress = LongPressGesture(minimumDuration: 0.2)
let infiniteLongPress = DragGesture(minimumDistance: 0, coordinateSpace: .local) // here !
...