下面是每 5 秒在不同图像之间自动转换的代码。我想为过渡添加动画,即淡入淡出、从左侧滚动等。我将如何在 Swift 中执行此操作?谢谢。
class ViewController: UIViewController {
@IBOutlet weak var imageView: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
imageView.animationImages = [
UIImage(named: "brooklyn-bridge.jpg")!,
UIImage(named: "grand-central-terminal.jpg")!,
UIImage(named: "new-york-city.jpg")!,
UIImage(named: "one-world-trade-center.jpg")!,
UIImage(named: "rain.jpg")!,
UIImage(named: "wall-street.jpg")!]
imageView.animationDuration = 25.0
imageView.startAnimating()
}
最佳答案
class ViewController: UIViewController {
@IBOutlet weak var imageView: UIImageView!
let images = [
UIImage(named: "brooklyn-bridge.jpg")!,
UIImage(named: "grand-central-terminal.jpg")!,
UIImage(named: "new-york-city.jpg"),
UIImage(named: "one-world-trade-center.jpg")!,
UIImage(named: "rain.jpg")!,
UIImage(named: "wall-street.jpg")!]
var index = 0
let animationDuration: NSTimeInterval = 0.25
let switchingInterval: NSTimeInterval = 3
override func viewDidLoad() {
super.viewDidLoad()
imageView.image = images[index++]
animateImageView()
}
func animateImageView() {
CATransaction.begin()
CATransaction.setAnimationDuration(animationDuration)
CATransaction.setCompletionBlock {
let delay = dispatch_time(DISPATCH_TIME_NOW, Int64(self.switchingInterval * NSTimeInterval(NSEC_PER_SEC)))
dispatch_after(delay, dispatch_get_main_queue()) {
self.animateImageView()
}
}
let transition = CATransition()
transition.type = kCATransitionFade
/*
transition.type = kCATransitionPush
transition.subtype = kCATransitionFromRight
*/
imageView.layer.addAnimation(transition, forKey: kCATransition)
imageView.image = images[index]
CATransaction.commit()
index = index < images.count - 1 ? index + 1 : 0
}
}
将其实现为自定义 ImageView 会更好。
关于ios - 在 Swift 中添加图像过渡动画,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/26898955/