以下是每5秒自动转换不同图像的代码.我想添加动画到转换,即淡入淡出,从左滚动等等.我将如何在
Swift中做这个？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()
}
解决方法
class ViewController: UIViewController {
@IBOutlet weak var imageView: UIImageView!
let images = [
UIImage(named: "brooklyn-bridge.jpg")!,UIImage(named: "new-york-city.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
}
}
将其实现为自定义图像视图会更好.
