IOS设备滑动事件

只要手指触摸屏幕，滑动，从屏幕离开，系统都会产生UIEvent对象类型的事件---当然包括UITouch事件 – touchesBegan:withEvent:   当用户触摸到屏幕时调用方法 – touchesMoved:withEvent:  当用户触摸到屏幕并移动时调用此方法 – touchesEnded:withEvent:  当触摸离开屏幕时调用此方法

– touchesCancelled:withEvent:  当触摸被取消时调用此方法

 例子如下：

//滑动开始事件- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event  {      UITouch *touch = [touches anyObject];      CGPoint pointone = [touch locationInView:self.view];//获得初始的接触点      self.startPoint  = pointone;  }//滑动移动事件- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event  {      UITouch *touch = [touches anyObject];  //imgViewTop是滑动后最后接触的View        CGPoint pointtwo = [touch locationInView:imgViewTop];  //获得滑动后最后接触屏幕的点                  if(fabs(pointtwo.x-startPoint.x)>100)        {  //判断两点间的距离              bMove = YES;        } }  //滑动结束处理事件-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{    UITouch *touch = [touches anyObject];        CGPoint pointtwo = [touch locationInView:self.view];  //获得滑动后最后接触屏幕的点         if((fabs(pointtwo.x-startPoint.x)>50)&&(bMove))        {            //判断点的位置关系 左滑动            if(pointtwo.x-startPoint.x>0)            {   //左滑动业务处理                if (clicks>0) {                    clicks--;                    if ([wyKPI.sortZbs count]>1) {                        [btnRight setEnabled:YES];                        if(clicks==0)                        {                            [btnLeft setEnabled:NO];                            [btnRight setEnabled:YES];                        }                        [labTitle setText:[wyKPI.sortZbs objectAtIndex:(NSUInteger)clicks]];                        [labTitle setFont:[UIFont systemFontOfSize:14.0f]];                        [tabWyKPI reloadData];                    }                }            }            //判断点的位置关系 右滑动            else            {  //右滑动业务处理                if (clicks<[wyKPI.sortZbs count]-1) {                    clicks++;                    if ([wyKPI.sortZbs count]>1) {                        [btnLeft setEnabled:YES];                        if(clicks==[wyKPI.sortZbs count]-1)                        {                            [btnLeft setEnabled:YES];                            [btnRight setEnabled:NO];                        }                        [labTitle setText:[wyKPI.sortZbs  objectAtIndex:clicks]];                        [labTitle setFont:[UIFont systemFontOfSize:14.0f]];                        [tabWyKPI reloadData];                    }                }            }          }}