重寫(xiě)父控件中的方法：(兩個(gè)方法任選其一：)

    - (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event;
    - (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event;

具體實(shí)現(xiàn)：

1. 方法一：
   //返回需要響應(yīng)事件的view位置
   - (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
   UIView *view = [super hitTest:point withEvent:event];
   if (view == nil) {
   //轉(zhuǎn)換坐標(biāo)系
   CGPoint newPoint = [self.thirdBtn convertPoint:point fromView:self];
   //判斷觸摸點(diǎn)是否在button上
   if (CGRectContainsPoint(self.thirdBtn.bounds, newPoint)) {
   view = self.thirdBtn;
   }
   //NSLog(@"point:%@ : newPoint:%@",NSStringFromCGPoint(point),NSStringFromCGPoint(newPoint));
   }
   return view;
   }
2. 方法二：
   //當(dāng)point在父控件和子控件包含的區(qū)域時(shí)，應(yīng)該返回YES，否則為NO；
   - (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event {
   NSLog(@"point:%@",NSStringFromCGPoint(point));
   if (!CGRectContainsPoint(self.bounds, point)) {
   //轉(zhuǎn)換坐標(biāo)系
   CGPoint newPoint = [self convertPoint:point toView:self.secondBtn];
   //NSLog(@"newPoit:%@",NSStringFromCGPoint(newPoint));
   //判斷觸摸點(diǎn)是否在secondBtn上
   if (CGRectContainsPoint(self.secondBtn.bounds, newPoint)) {
   return YES;
   }
   return NO;
   }
   return YES;
   }

難點(diǎn)：

1. 判斷一個(gè)點(diǎn)是否在某個(gè)范圍內(nèi)

• CGRectContainsPoint(Rect, Point); //判斷Rect中是否包含Point

• CGRectContainsRect(Rect1,Rect2);//判斷Rect1中是否包含Rect2

2. 實(shí)現(xiàn)對(duì)控制點(diǎn)坐標(biāo)系的轉(zhuǎn)換

    `view1:視圖一` `view2:視圖二` 
    `point:view1坐標(biāo)系中的點(diǎn)` `newPoint：新得到view2坐標(biāo)系中的點(diǎn)`
    //將point從view1的坐標(biāo)系中轉(zhuǎn)換到view2的坐標(biāo)系中得到newPoint
    CGPoint newPoint = [view2 convertPoint:point fromView:view1];
    CGPoint newPoint = [view1 convertPoint:point toView:view2];
    類(lèi)似方法：
    - (CGRect)convertRect:(CGRect)rect toView:(nullable UIView *)view;
    - (CGRect)convertRect:(CGRect)rect fromView:(nullable UIView *)view;