扩大按钮的点击范围

// UIView的方法

• (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event
  {
  CGRect rect = [self enlargedRect];
  if (CGRectEqualToRect(rect, self.bounds)) {
  return [super hitTest:point withEvent:event];
  }
  // CGRectContainsPoint(rect, point) 点在矩形之内
  return CGRectContainsPoint(rect, point) ? self : nil;
  }

1.实际上就是通过UIView的- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event（判断点击的点是否在本view之中）这个方法。重写这个方法可以增大CGRect的范围来是的点击的点在设置的CGRect之中