如何突出显示UIButton的背景颜色？ [英] How to change the background color of a UIButton while it's highlighted?

问题描述

在我的应用中的某个时刻，我有一个突出显示的 UIButton （例如当用户将手指放在按钮上时）我需要更改背景颜色按钮突出显示（因此，当用户的手指仍在按钮上时）。

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).

我尝试了以下内容：

_button.backgroundColor = [UIColor redColor];

但它不起作用。颜色保持不变。当按钮没有突出显示时我尝试了相同的代码，它工作正常。我也尝试在更改颜色后调用 -setNeedsDisplay ，它没有任何效果。

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.

如何强制用于更改背景颜色的按钮？

How to force the button to change the background color?

推荐答案

您可以覆盖 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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