写一个分类，重写UIButton的- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event方法，对响应热区进行放大
上代码
#import "UIButton+EX.h"
@implementation UIButton (EX)
- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event {
CGRect bounds = self.bounds;
//若原热区小于44x44，则放大热区，否则保持原大小不变
CGFloat widthDelta = MAX(44.0 - bounds.size.width, 0);
CGFloat heightDelta = MAX(44.0 - bounds.size.height, 0);
bounds = CGRectInset(bounds, -0.5 * widthDelta, -0.5 * heightDelta);
return CGRectContainsPoint(bounds, point);
}
@end
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