如何在UIImageView中动画图像的变化?

我有一个带有图像的UIImageView。现在我有一个全新的图像(图形文件)，并想要在这个UIImageView中显示它。如果我设置

myImageView.image = newImage;

新图像立即可见。不可以做成动画。

我想让它很好地淡出到新图像中。我想也许有比在上面创建一个新的UIImageView并与动画混合更好的解决方案?

当前回答

弗拉基米尔的答案是完美的，但任何像我这样正在寻找快速解决方案的人

该方案适用于swift 4.2版本

var i = 0
    func animation(){
        let name = (i % 2 == 0) ? "1.png" : "2.png"
        myImageView.image = UIImage.init(named: name)
        let transition: CATransition = CATransition.init()
        transition.duration = 1.0
        transition.timingFunction = CAMediaTimingFunction.init(name: .easeInEaseOut)
        transition.type = .fade
        myImageView.layer.add(transition, forKey: nil)
        i += 1
    }

您可以在任何地方调用此方法。它将改变图像到下一个(图像)与动画。

对于Swift 4.0版本使用波纹管解决方案

var i = 0
    func animationVersion4(){
        let name = (i % 2 == 0) ? "1.png" : "2.png"
        uiImage.image = UIImage.init(named: name)
        let transition: CATransition = CATransition.init()
        transition.duration = 1.0
        transition.timingFunction = CAMediaTimingFunction.init(name: kCAMediaTimingFunctionEaseInEaseOut)
        transition.type = kCATransitionFade
        uiImage.layer.add(transition, forKey: nil)
        i += 1
    }

2018-12-07 12:14:21

其他回答

在iOS 5中，这就简单多了:

[newView setAlpha:0.0];
[UIView animateWithDuration:0.4 animations:^{
    [newView setAlpha:0.5];
}];

2012-02-14 09:24:48

我不确定你是否可以用渐隐效果动画UIViews，因为似乎所有支持的视图转换都在UIViewAnimationTransition枚举中定义。渐变效果可以使用CoreAnimation实现。该方法的示例示例:

#import <QuartzCore/QuartzCore.h>
...
imageView.image = [UIImage imageNamed:(i % 2) ? @"3.jpg" : @"4.jpg"];

CATransition *transition = [CATransition animation];
transition.duration = 1.0f;
transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
transition.type = kCATransitionFade;

[imageView.layer addAnimation:transition forKey:nil];

2010-05-14 14:02:40

Swift 5扩展:

extension UIImageView{
    func setImage(_ image: UIImage?, animated: Bool = true) {
        let duration = animated ? 0.3 : 0.0
        UIView.transition(with: self, duration: duration, options: .transitionCrossDissolve, animations: {
            self.image = image
        }, completion: nil)
    }
}

2020-07-14 17:56:29

试试这个:

_imageView.image = image;
[_imageView.layer addAnimation:[CATransition animation] forKey:kCATransition];

2013-12-01 17:58:33