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?
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
CABasicAnimation* fadeAnim = [CABasicAnimation animationWithKeyPath:@"contents"];
fadeAnim.fromValue = (__bridge id)imageView.image.CGImage;
fadeAnim.toValue = (__bridge id)[UIImage imageNamed:@"newImage.png"].CGImage;
fadeAnim.duration = 2.0;
[imageView.layer addAnimation:fadeAnim forKey:@"contents"];
imageView.layer.contents = (__bridge id)[UIImage imageNamed:@"newImage.png"].CGImage;
其他回答
为什么不试试这个呢?
NSArray *animationFrames = [NSArray arrayWithObjects:
[UIImage imageWithName:@"image1.png"],
[UIImage imageWithName:@"image2.png"],
nil];
UIImageView *animatedImageView = [[UIImageView alloc] init];
animatedImageView.animationImages = animationsFrame;
[animatedImageView setAnimationRepeatCount:1];
[animatedImageView startAnimating];
快速版本:
let animationsFrames = [UIImage(named: "image1.png"), UIImage(named: "image2.png")]
let animatedImageView = UIImageView()
animatedImageView.animationImages = animationsFrames
animatedImageView.animationRepeatCount = 1
animatedImageView.startAnimating()
这里有一些不同的方法:UIAnimations,在我看来,这听起来像是你的挑战。
编辑:我太懒了:)
在这篇文章中,我提到了这个方法:
[newView setFrame:CGRectMake( 0.0f, 480.0f, 320.0f, 480.0f)]; //notice this is OFF screen!
[UIView beginAnimations:@"animateTableView" context:nil];
[UIView setAnimationDuration:0.4];
[newView setFrame:CGRectMake( 0.0f, 0.0f, 320.0f, 480.0f)]; //notice this is ON screen!
[UIView commitAnimations];
但是不是动画帧,而是动画alpha:
[newView setAlpha:0.0]; // set it to zero so it is all gone.
[UIView beginAnimations:@"animateTableView" context:nil];
[UIView setAnimationDuration:0.4];
[newView setAlpha:0.5]; //this will change the newView alpha from its previous zero value to 0.5f
[UIView commitAnimations];
[UIView transitionWithView:textFieldimageView
duration:0.2f
options:UIViewAnimationOptionTransitionCrossDissolve
animations:^{
imageView.image = newImage;
} completion:nil];
是另一种可能性
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
}
代码:
var fadeAnim:CABasicAnimation = CABasicAnimation(keyPath: "contents");
fadeAnim.fromValue = firstImage;
fadeAnim.toValue = secondImage;
fadeAnim.duration = 0.8; //smoothest value
imageView.layer.addAnimation(fadeAnim, forKey: "contents");
imageView.image = secondImage;
例子:
有趣,更详细的解决方案:(切换水龙头)
let fadeAnim:CABasicAnimation = CABasicAnimation(keyPath: "contents");
switch imageView.image {
case firstImage?:
fadeAnim.fromValue = firstImage;
fadeAnim.toValue = secondImage;
imageView.image = secondImage;
default:
fadeAnim.fromValue = secondImage;
fadeAnim.toValue = firstImage;
imageView.image = firstImage;
}
fadeAnim.duration = 0.8;
imageView.layer.addAnimation(fadeAnim, forKey: "contents");