苹果官方Toast Demo关键代码，Swift实现

显示部分

func showToast(_ text: String) {

label.text = text

guard toast.alpha == 0 else {

return

}

toast.layer.masksToBounds = true

toast.layer.cornerRadius = 7.5

UIView.animate(withDuration: 0.25, animations: {

self.toast.alpha = 1

self.toast.frame = self.toast.frame.insetBy(dx: -5, dy: -5)

})

}

隐藏部分

func hideToast() {

UIView.animate(withDuration: 0.25, animations: {

self.toast.alpha = 0

self.toast.frame = self.toast.frame.insetBy(dx: 5, dy: 5)

})

}