重寫uibutton的方法犬钢，擴(kuò)大點擊熱區(qū)
- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent*)event
{
CGRect bounds = self.bounds;
//若原熱區(qū)小于44x44，則放大熱區(qū)，否則保持原大小不變
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);
}
