单击选定的 UIButton 时未显示 UIButton 突出显示状态 [英] UIButton Highlighted State not showing when clicking over a Selected UIButton

问题描述

我希望我的 UIButton 在我单击已选择的按钮时显示突出显示状态.

I want my UIButton to show up the highlighted state when I click over a button that is already selected.

基本上在突出显示的状态下，我将 *.png 图像应用为我的 UIButton backgroundImage 以提供按下效果.

Basically in the highlighted state I apply a *.png image as my UIButton backgroundImage to give a pressed down effect.

但是如果按钮已经处于选中状态，当我再次点击它时，我只是看不到突出显示的状态，但它会直接进入正常状态！

But if the button is already in the Selected State When I click over it again I just can't see the highlighted state but it goes straight to the normal state!

观看问题--> 问题视频！

请帮忙

//0    init UIButton
UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(x, y, aSide, aSide)];

//1    Give it a backgroundColor
[button setBackgroundColor:aColor];

[..]

//2    Set titleLabel and its style
[button setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
[button setTitleColor:[UIColor redColor] forState:UIControlStateSelected];
[button setTitleColor:[UIColor grayColor] forState:UIControlStateHighlighted];

UIImage *shadowImage = [UIImage imageNamed:kBtnShadow];
shadowImage = [shadowImage stretchableImageWithLeftCapWidth:floorf(shadowImage.size.width/2) topCapHeight:floorf(shadowImage.size.height/2)];

[button setBackgroundImage:shadowImage forState: UIControlStateHighlighted];

[button setTitle:aLabel forState:  UIControlStateNormal];

//3    Assign tag and Action
[button setTag:tag];
[button addTarget:target action:a forControlEvents:UIControlEventTouchUpInside];

推荐答案

各种状态:UIControlStateNormal、UIControlStateSelected 和 (UIControlStateSelected | UIControlStateHighlighted) 实际上都是不同的.如果您希望 shadowImage 同时应用于(仅)突出显示状态和突出显示+选择状态，您还必须设置:

The various states: UIControlStateNormal, UIControlStateSelected, and (UIControlStateSelected | UIControlStateHighlighted) are all actually distinct. If you want your shadowImage to apply both in the (only) highlighted state and in the highlighted+selected state, you must also set:

[button setBackgroundImage:shadowImage forState:(UIControlStateHighlighted | UIControlStateSelected)]

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