第七篇、hitTest UITabbar中间突出按钮

简介：　　以前UITabbar使用中间有一个凸起按钮时，常常就需要用到hitTest来处理可点击的范围。

示例代码：

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event
{
     UIView *hitView = nil;
     //NSLog(@"point:%@", NSStringFromCGPoint(point));
     UIButton *roundBtn = (UIButton *)[self viewWithTag:10086];
     UIButton *leftBtn = (UIButton *)[self viewWithTag:10087];
     UIButton *rightBtn = (UIButton *)[self viewWithTag:10088];
     BOOL pointInRound = [self touchPointInsideCircle:roundBtn.center radius:30 targetPoint:point];
     if (pointInRound) {
         hitView = roundBtn;
     } else if(CGRectContainsPoint(leftBtn.frame, point)) {
         hitView  = leftBtn;
     } else if(CGRectContainsPoint(rightBtn.frame, point)) {
         hitView = rightBtn;
     } else {
         hitView = self;
     }
     return hitView;
 }