Ios 在计时器中运行UIView.animate
我做了一个应用程序，从数字10开始每秒钟倒计时一次。倒计时已设置动画。代码如下：Ios 在计时器中运行UIView.animate,ios,animation,uiview,timer,Ios,Animation,Uiview,Timer,我做了一个应用程序，从数字10开始每秒钟倒计时一次。倒计时已设置动画。代码如下： import UIKit class ViewController: UIViewController { var startNumber = 10 lazy var numberLabel: UILabel = { let label = UILabel() label.translatesAutoresizingMaskIntoConstraints = f
import UIKit
class ViewController: UIViewController {
var startNumber = 10
lazy var numberLabel: UILabel = {
let label = UILabel()
label.translatesAutoresizingMaskIntoConstraints = false
label.font = label.font.withSize(160)
label.textColor = .lightGray
return label
}()
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .white
view.addSubview(numberLabel)
NSLayoutConstraint.activate([
numberLabel.centerXAnchor.constraint(equalTo: view.centerXAnchor),
numberLabel.centerYAnchor.constraint(equalTo: view.centerYAnchor)
])
_ = Timer.scheduledTimer(withTimeInterval: 1, repeats: true) { (time) in
self.numberLabel.text = String(self.startNumber)
self.startNumber -= 1
UIView.animate(withDuration: 0.99, animations: {
self.numberLabel.alpha = 0
}, completion: { (true) in
self.numberLabel.alpha = 1
})
}
}
}
2） 倒计时是每秒钟还是0.99秒倒计时 将代码更改为那样
_ = Timer.scheduledTimer(withTimeInterval: 1, repeats: true) { (time) in
self.startNumber -= 1
self.numberLabel.alpha = 1
UIView.setAnimationCurve(UIViewAnimationCurve.easeInOut)
UIView.animate(withDuration: 1, animations: {
self.numberLabel.text = String(self.startNumber)
self.numberLabel.alpha = 0
}, completion: { (true) in
})
}
将代码更改为那样
_ = Timer.scheduledTimer(withTimeInterval: 1, repeats: true) { (time) in
self.startNumber -= 1
self.numberLabel.alpha = 1
UIView.setAnimationCurve(UIViewAnimationCurve.easeInOut)
UIView.animate(withDuration: 1, animations: {
self.numberLabel.text = String(self.startNumber)
self.numberLabel.alpha = 0
}, completion: { (true) in
})
}