kCATransitionPush应用于从UIImageview滑入/滑出图像，无褪色/透明效果

Question

我在屏幕上的某个位置有一个UIImageView：

self.imageView = [[UIImageView alloc] init];
self.imageView.clipsToBounds = YES;
self.imageView.image = [UIImage imageNamed:@"food"];
[self.imageView setFrame:CGRectMake(0, 0 , (self.view.frame.size.width/5), 60)];

然后，我必须在UIImageView中插入另一个图像，我使用了以下代码：

self.imageView.image = NULL;
CATransition *animation = [CATransition animation];
        [animation setDuration:0.75];
        [animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear]];
        [animation setType:kCATransitionPush];
        [animation setSubtype:kCATransitionFromLeft];
        animation.delegate = self;
        [[self.imageView layer] addAnimation:animation forKey:nil];

但当第一张图像滑出时，它会淡出（或者在imageView的边缘看起来是透明的）。我尝试了尽可能多的在线解决方案，比如在动画过程中设置图层属性以消除淡入度，或者将图层不透明度指定为1.0，但它们似乎都不起作用。任何帮助都将不胜感激。谢谢

Answer 1

您可以使用另一个图像视图和UIView动画尝试不同的方法：

UIImage *newImage = [UIImage imageNamed:@"newImage"];
UIImageView *imageView = [[UIImageView alloc] initWithImage:newImage];
imageView.frame = self.imageView.frame;
[self.view addSubview:imageView];

imageView.transform = CGAffineTransformMakeTranslation(-imageView.frame.size.width, 0);
[UIView animateWithDuration:0.75 delay:0 options:UIViewAnimationOptionCurveLinear animations:^()
{
    imageView.transform = CGAffineTransformIdentity;
}
                 completion:^(BOOL finished)
{
    self.imageView.image = newImage;
    [imageView removeFromSuperview];
}];