在我的界面上有一个加在keyWindow上的按钮。想在侧滑返回的时候像导航栏渐变消失。效果如下
2017-03-09 17_23_30.gif
核心代码
navigationController?.interactivePopGestureRecognizer?.addTarget(self, action: #selector(action))
func action(sender: UIScreenEdgePanGestureRecognizer) {
switch sender.state {
case .changed:
let x = sender.translation(in: view).x
let progress = 1 - x / view.frame.width
postButton.alpha = progress
default:
UIView.animate(withDuration: 0.4) {
self.postButton.alpha = 1
}
}
}
