總結(jié)：當(dāng)button的狀態(tài)為selected的時(shí)候馍迄，高亮?xí)r對(duì)應(yīng)的狀態(tài)應(yīng)該是selected|highlighted捅儒，這與normal下高亮的狀態(tài)highlighted不同灰蛙。
以下是stackover上的提問圣贸，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.
（uibutton選中狀態(tài)和高亮狀態(tài)的區(qū)別：選中可以常態(tài)，高亮狀態(tài)在Down才有效于宙，up時(shí)候狀態(tài)無(wú)效）－－－－按下未抬起時(shí)為高亮狀態(tài)
