只要手指觸摸屏幕，滑動，從屏幕離開，系統都會產生UIEvent對象類型的事件---當然包括UITouch事件 – touchesBegan:withEvent:   當用戶觸摸到屏幕時調用方法 – touchesMoved:withEvent:  當用戶觸摸到屏幕并移動時調用此方法 – touchesEnded:withEvent:  當觸摸離開屏幕時調用此方法

– touchesCancelled:withEvent:  當觸摸被取消時調用此方法

 例子如下：

//滑動開始事件- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event  {      UITouch *touch = [touches anyObject];      CGPoint pointone = [touch locationInView:self.view];//獲得初始的接觸點      self.startPoint  = pointone;  }//滑動移動事件- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event  {      UITouch *touch = [touches anyObject];  //imgViewTop是滑動后最后接觸的View        CGPoint pointtwo = [touch locationInView:imgViewTop];  //獲得滑動后最后接觸屏幕的點                  if(fabs(pointtwo.x-startPoint.x)>100)        {  //判斷兩點間的距離              bMove = YES;        } }  //滑動結束處理事件-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{    UITouch *touch = [touches anyObject];        CGPoint pointtwo = [touch locationInView:self.view];  //獲得滑動后最后接觸屏幕的點         if((fabs(pointtwo.x-startPoint.x)>50)&&(bMove))        {            //判斷點的位置關系 左滑動            if(pointtwo.x-startPoint.x>0)            {   //左滑動業務處理                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];                    }                }            }            //判斷點的位置關系 右滑動            else            {  //右滑動業務處理                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];                    }                }            }          }}