总结：
当button的状态为selected的时候，高亮时对应的状态应该是selected|highlighted，这与normal下高亮的状态highlighted不同。
以下是stackover上的提问，附上：
I've a
UIButton and I set it with:
UIButton *myButton = [UIButton buttonWithType:UIButtonTypeCustom];
UIImage *imageNormal = [UIImage imageNamed:@"normal.png"];
UIImage *imageNormalHover = [UIImage imageNamed:@"normalHover.png"];
UIImage *imageSelected = [UIImage imageNamed:@"selected.png"];
UIImage *imageSelectedHover = [UIImage imageNamed:@"selectedHover.png"];
[myButton setImage:imageNormal forState:UIControlStateNormal];
[myButton setImage:imageSelected forState:UIControlStateSelected];
if (boolVar) {
[myButton setSelected:YES];
[myButton setImage:imageSelectedHover forState:UIControlStateHighlighted];
} else {
[myButton setImage:imageNormalHover forState:UIControlStateHighlighted];
}
The issue is when the state is normal and I try to press the button I see correctly the image
normalHover.png but when the state is selected and I try to press the button I see still
normalHover.png and not the
selectedHover.png. It seems that with
UIButton I'm unable to change the highlighted image. Do you how to solve?
Answer：
You need to set the image for the
UIControlStateSelected | UIControlStateHighlighted combined state:
[myButton setImage:imageSelectedHover forState:(UIControlStateSelected | UIControlStateHighlighted)];
Because both states are on when the button is selected and you hignlight it by tapping on it.
posted on 2013-12-16 18:14
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