Question

我试图交叉淡入新图像。这是一个添加了UIVisualEffectView的UIImageView：

self.bgBlurEffect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleDark];
self.visualEffectView = [[UIVisualEffectView alloc] initWithEffect:self.bgBlurEffect];

self.visualEffectView.frame = self.bgImageView.bounds;
[self.bgImageView addSubview:self.visualEffectView];

以下是我尝试淡入新图片的方式：

UIImage *toImage = [UIImage imageNamed:imgName];

CABasicAnimation *crossFade = [CABasicAnimation animationWithKeyPath:@"contents"];
crossFade.duration = 2.5;
crossFade.delegate = self;
crossFade.fromValue = (id)self.bgImageView.image.CGImage;
crossFade.toValue = (id)toImage.CGImage;
[self.bgImageView.layer addAnimation:crossFade forKey:@"animateContents"];
self.bgImageView.image = toImage;

这实际上可以在模拟器中使用，但在设备（iPhone 6）上，图像完全变为灰色2.5秒，然后新图像立即出现。关于如何解决这个问题的任何想法？

编辑：这不起作用：

[UIView transitionWithView:self.bgImageView
                  duration:2.5
                   options:UIViewAnimationOptionTransitionCrossDissolve
                animations:^{
                    self.bgImageView.image = toImage;
                } completion:nil];

Answer 1

也许这种方法适用于淡入淡出动画：

self.bgImageView.image = toImage;

CATransition *fadeTransition = [CATransition animation];
fadeTransition.duration = 2.5;
fadeTransition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];
fadeTransition.type = kCATransitionFade;

[self.bgImageView.layer addAnimation:fadeTransition forKey:nil];

如何应用模糊交叉淡化UIImageView的图像

1 个答案: