如何扩大 UIGestureRecognizer 的命中区域? [英] How to enlarge hit area of UIGestureRecognizer?

问题描述

我在某些视图上使用的手势识别器很少，但有时视图太小而且很难点击.使用识别器是必须的，如何扩大命中区域?

I'm using few gesture recognizers on some views, but sometimes views are too small and it's hard to hit it. Using recognizers is necessary, so how can I enlarge hit area?

推荐答案

如果您是为自定义 UIView 执行此操作，则应该能够覆盖 hitTest:withEvent:方法:

If you are doing this for a custom UIView, you should be able to override the hitTest:withEvent: method:

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
    CGRect frame = CGRectInset(self.bounds, -20, -20);

    return CGRectContainsPoint(frame, point) ? self : nil;
}

上面的代码将在视图周围添加一个 20 磅的边框.点击该区域中的任意位置(或视图本身)将表示命中.

The above code will add a 20 point border around the view. Tapping anywhere in that area (or on the view itself) will indicate a hit.

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