如何扩展UIButton的hitTest区域而不扩展其背景图像? [英] How to expand the hitTest area of a UIButton without extruding it's background image?

问题描述

我已经设置了UIButton的背景图像并在其上放了一个标题(我使用的是setBackgroundImage方法而不是setImage).现在，我想扩展UIButton的hitTest区域而不扩展它的背景图像.

I have set the UIButton's background image and put a title on it(I used setBackgroundImage method not setImage). Now I want to expand the hitTest area of a UIButton without extrude it's background image.

我该怎么做?

推荐答案

好吧，您可以扩展UIButton并覆盖UIView的hitTest方法:

Well, you could extend UIButton and override UIView's hitTest method:

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
    int expandMargin = 20;
    CGRect extendedFrame = CGRectMake(0 - expandMargin , 0 - expandMargin , self.bounds.size.width + (expandMargin * 2) , self.bounds.size.height + (expandMargin * 2));
    return (CGRectContainsPoint(extendedFrame , point) == 1) ? self : nil;
}

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