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

问题描述

我在一些视图上使用的手势识别器很少，但有时视图太小而且难以击中它。使用识别器是必要的，那么如何扩大命中区域呢？

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

如果你这样做是为了自定义 UIView ，你应该能够覆盖 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;
}

以上代码将在视图周围添加20点边框。点击该区域中的任何位置（或视图本身）将指示命中。

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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