UIButton ignoring contentMode when highlighted (adjustsImageWhenHighlighted)

Question

I set a UIImage for my UIButton using [myButton setImage:forState:]; and I set it's contentMode using [[myButton imageView] setContentMode:UIViewContentModeScaleAspectFit]; But when you tap the button, it goes back to UIViewContentModeScaleToFill and stretches my image out.

using adjustsImageWhenHighlighted fixes this, but then I loose the darkening effect, which I would like to keep.

Any suggestions on how to cope with this?

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];        
    }];
}

Answer 2

my solution to this problem (maybe not efficient but it gives you an oportunity to customize the highlight effect, i think it looks better then standard one) is:

• subclass UIButton of course.
• add property @property (nonatomic, retain) UIView *highlightView;

• method for setting image (my method, you can use different mode important to set adjustsImageWhenHighlighted property)

  [self setImage:image forState:UIControlStateNormal];
  [self setAdjustsImageWhenHighlighted:NO];
  

• override setHighlighted: method like so:

  \- (void)setHighlighted:(BOOL)highlighted {
      if (!highlightView) {
          self.highlightView = [[[UIView alloc] initWithFrame:self.bounds] autorelease];
          self.highlightView.backgroundColor = [UIColor darkGrayColor];
          self.highlightView.alpha = 0.0;
          [self addSubview:self.highlightView];
      }
      if (highlighted) {
          [UIView beginAnimations:@"highlight" context:nil];
          [UIView setAnimationDuration:0.2];
          highlightView.alpha = 0.5;
          [UIView commitAnimations];
      }
      else {
          [UIView beginAnimations:@"highlight" context:nil];
          [UIView setAnimationDuration:0.2];
          highlightView.alpha = 0.0;
          [UIView commitAnimations];
      }
  }
  

This works for me, but if there is a better way, i'll be glad to get to know it.