这款应用目前以黑色背景开始。我想要一个在黑色背景上写着“警告可能会导致癫痫发作”的标签，一旦屏幕被按下，标签就会消失。这真的很简单，但我是新手
import UIKit
class ViewController: UIViewController {
let colors: [UIColor] = [
.systemYellow,
.systemGreen,
.systemPurple,
.systemPink,
.systemRed,
.systemBlue,
.systemOrange,
.magenta, .darkGray, .gray, .lightGray, .brown, .cyan
]
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .clear
}
@IBAction func didTapButton() {
let color1 = self.colors.randomElement()
let color2 = self.colors.randomElement()
self.view.layer.removeAllAnimations()
self.view.backgroundColor = color1 /// set to color1
UIView.animate(withDuration: 1/25, delay: 0, options: [.repeat, .autoreverse, .allowUserInteraction]) {
self.view.backgroundColor = .black
self.view.backgroundColor = color2// now animate to color2, reverse, then repeat
}
}
}
这是假设你按下的按钮有你描述的标签（从你过去的问题看像是案例）。
@IBAction func didTapButton(_ sender: UIButton) { //<-- Here
sender.isHidden = true //<-- Here
let color1 = self.colors.randomElement()
let color2 = self.colors.randomElement()
self.view.layer.removeAllAnimations()
self.view.backgroundColor = color1 /// set to color1
UIView.animate(withDuration: 1/25, delay: 0, options: [.repeat, .autoreverse, .allowUserInteraction]) {
self.view.backgroundColor = .black
self.view.backgroundColor = color2// now animate to color2, reverse, then repeat
}
}
}
如果它是一个不同的按钮/标签，您可以在@IBOutlet处与Interface Builder中的UIButton/UILabel挂钩，并使用.ishidden=true的相同技术来隐藏它。
