这款应用目前以黑屏开始，当按下中间的按钮时，它会在每次按下按钮时改变背景颜色。但我希望应用程序闪烁或闪烁2种不同的颜色：而不是只显示一种不闪烁的颜色。
import UIKit
class ViewController: UIViewController {
let colors: [UIColor] = [
.systemYellow,
.systemGreen,
.systemPurple,
.systemPink,
.systemRed,
.systemBlue,
.systemOrange,
.black,.gray
]
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .clear
}
@IBAction func didTapButton() {
UIView.animate(withDuration: 1/12, delay:0, options:[ ], animations: {
self.view.backgroundColor = self.colors.randomElement()
self.view.backgroundColor = self.colors.randomElement()
}, completion: nil)
}
}
请在下面尝试
UIView.animate(withDuration: 1.0, delay: 0, options: .curveEaseOut, animations: {
self.view.backgroundColor = self.colors.randomElement()
}, completion: { finished in
print("another animation! - 1")
UIView.animate(withDuration: 1.0, delay: 0, options: .curveEaseOut, animations: {
self.view.backgroundColor = self.colors.randomElement()
}, completion: { finished in
print("another animation! - 2")
})
})
永远用在下面。
func showColor() {
UIView.animate(withDuration: 1.0, delay: 0, options: .curveEaseOut, animations: {
self.view.backgroundColor = self.colors.randomElement()
}, completion: { finished in
print("another animation! - 1")
Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(showColorAgain), userInfo: nil, repeats: false)
})
}
@objc func showColorAgain() {
showColor()
}
现在，要使您的逻辑直到下一次单击，您可以在zShowColorAgain`函数中处理它。
