objective-c - iOS Cross Dissolve 没有较暗的中间

Question

我们正在尝试在两个几乎完全相同的图像(几乎是动画帧)之间进行渐隐，但到目前为止，我们无法消除渐隐中途发生的变暗。客户非常坚定不让这种深色溶解，有什么想法吗？

 UIImageView *newImageView = [[UIImageView alloc] initWithFrame:imageViewSmileDesign.frame];
newImageView.image = imageViewSmileDesign.image;
[self.view addSubview:newImageView];

imageViewSmileDesign.image = [UIImage imageNamed:[NSString stringWithFormat:@"%@.jpg", result]];
imageViewSmileDesign.alpha = 0;

[UIView animateWithDuration:0.5 animations:^{
    imageViewSmileDesign.alpha = 1;
    newImageView.alpha = 0;
} completion:^(BOOL finished) {
    [newImageView removeFromSuperview];
} ];

感谢您的关注。

Answer 1

您可以使用 UIView 中内置的交叉溶解动画:

+ (void)transitionFromView:(UIView *)fromView toView:(UIView *)toView duration:(NSTimeInterval)duration options:(UIViewAnimationOptions)options completion:(void (^)(BOOL finished))completion

将选项设置为 UIViewAnimationOptionTransitionCrossDissolve。