iOS－响应上下左右滑动手势

-(void)viewDidLoad{
UISwipeGestureRecognizer *recognizer; 
recognizer = [[UISwipeGestureRecognizeralloc]initWithTarget:selfaction:@selector(handleSwipeFrom:)];
    [recognizer
setDirection:(UISwipeGestureRecognizerDirectionRight)];
   [[selfview]
addGestureRecognizer:recognizer];
[recognizerrelease];

    recognizer = [[UISwipeGestureRecognizer
alloc]initWithTarget:selfaction:@selector(handleSwipeFrom:)];
    [recognizer
setDirection:(UISwipeGestureRecognizerDirectionLeft)];
   [[selfview]
addGestureRecognizer:recognizer];
[recognizerrelease];
 recognizer = [[UISwipeGestureRecognizeralloc]initWithTarget:selfaction:@selector(handleSwipeFrom:)];
    [recognizer
setDirection:(UISwipeGestureRecognizerDirectionUp)];
   [[selfview]
addGestureRecognizer:recognizer];
[recognizerrelease];
 
 UISwipeGestureRecognizer
*recognizer;
    recognizer = [[UISwipeGestureRecognizeralloc]initWithTarget:selfaction:@selector(handleSwipeFrom:)];
    [recognizer
setDirection:(UISwipeGestureRecognizerDirectionDown)];
   [[selfview]
addGestureRecognizer:recognizer];
[recognizerrelease];

}
-(void)handleSwipeFrom:(UISwipeGestureRecognizer *)recognizer{
if(recognizer.direction==UISwipeGestureRecognizerDirectionDown)
{
      NSLog(@"swipe down");
//执行程序
}
if(recognizer.direction==UISwipeGestureRecognizerDirectionUp)
{
      NSLog(@"swipe up");
//执行程序
}

if(recognizer.direction==UISwipeGestureRecognizerDirectionLeft)
{
      NSLog(@"swipe left");
//执行程序
}

if(recognizer.direction==UISwipeGestureRecognizerDirectionRight)
{
      NSLog(@"swipe right");
//执行程序
}

}