image - UIButton 在突出显示时忽略 contentMode(adjustsImageWhenHighlighted)

Question

我使用 [myButton setImage:forState:]; 为我的 UIButton 设置了一个 UIImage我使用 [[myButton imageView] setContentMode:UIViewContentModeScaleAspectFit]; 将其设置为 contentMode但是当你点击按钮时，它会返回到 UIViewContentModeScaleToFill 并拉伸(stretch)我的图像。

使用 adjustsImageWhenHighlighted 解决了这个问题，但后来我失去了变暗效果，我想保留它。

关于如何处理这个问题有什么建议吗？

Answer 1

UIButton *imageBtn = [UIButton ...
imageBtn.adjustsImageWhenHighlighted = NO;

[imageBtn addTarget:self action:@selector(doSomething:) forControlEvents:UIControlEventTouchUpInside];

[imageBtn addTarget:self action:@selector(doHighlighted:) forControlEvents:UIControlEventTouchDown];
[imageBtn addTarget:self action:@selector(doHighlighted:) forControlEvents:UIControlEventTouchDragEnter];
    [imageBtn addTarget:self action:@selector(doCancelHighlighted:) forControlEvents:UIControlEventTouchDragExit];

-(void)doSomething:(UIButton *)button{
    ...
    [self performSelector:@selector(doCancelHighlighted:) withObject:button afterDelay:0.2f];
}

-(void)doHighlighted:(UIButton *)button{
    UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(5, 5, 300, 300)];
    imageView.backgroundColor = [UIColor blackColor];
    imageView.alpha = 0.7;
    imageView.tag = 1000;
    [button addSubview:imageView];
}

-(void)doCancelHighlighted:(UIButton *)button{
    UIView *view = [button subviewWithTag:1000];
    [UIView animateWithDuration:0.2f animations:^{
        view.alpha = 0;
    } completion:^(BOOL finished) {
        [view removeFromSuperview];        
    }];
}