突出显示时如何更改 UIButton 的背景颜色?

问题描述

在我的应用程序中的某个时刻，我有一个突出显示的 UIButton(例如，当用户将手指放在按钮上时)并且我需要在按钮突出显示时更改背景颜色(所以当用户的手指仍在按钮上).

At some point in my app I have a highlighted UIButton (for example when a user has his finger on the button) and I need to change the background color while the button is highlighted (so while the finger of the user is still on the button).

我尝试了以下方法:

_button.backgroundColor = [UIColor redColor];

但它不起作用.颜色保持不变.当按钮未突出显示并且工作正常时，我尝试了相同的代码.我也试过在改变颜色后调用-setNeedsDisplay，没有任何效果.

But it is not working. The color remains the same. I tried the same piece of code when the button is not highlighted and it works fine. I also tried calling -setNeedsDisplay after changing the color, it didn't have any effect.

如何强制按钮改变背景颜色?

How to force the button to change the background color?

推荐答案

你可以重写UIButton的setHighlighted方法.

Objective-C

- (void)setHighlighted:(BOOL)highlighted {
    [super setHighlighted:highlighted];

    if (highlighted) {
        self.backgroundColor = UIColorFromRGB(0x387038);
    } else {
        self.backgroundColor = UIColorFromRGB(0x5bb75b);
    }
}

Swift 3.0 和 Swift 4.1

override open var isHighlighted: Bool {
    didSet {
        backgroundColor = isHighlighted ? UIColor.black : UIColor.white
    }
}

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