ios--響應上下左右滑動手勢

-(void)viewDidLoad{

UISwipeGestureRecognizer *recognizer; 

recognizer = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(handleSwipeFrom:)];

     [recognizer setDirection:(UISwipeGestureRecognizerDirectionRight)];

    [[self view] addGestureRecognizer:recognizer];

[recognizer release];

    recognizer = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(handleSwipeFrom:)];

     [recognizer setDirection:(UISwipeGestureRecognizerDirectionLeft)];

    [[self view] addGestureRecognizer:recognizer];

[recognizer release];

 recognizer = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(handleSwipeFrom:)];

     [recognizer setDirection:(UISwipeGestureRecognizerDirectionUp)];

    [[self view] addGestureRecognizer:recognizer];

[recognizer release];

 UISwipeGestureRecognizer *recognizer;

    recognizer = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(handleSwipeFrom:)];

     [recognizer setDirection:(UISwipeGestureRecognizerDirectionDown)];

    [[self view] addGestureRecognizer:recognizer];

[recognizer release];

}

-(void)handleSwipeFrom:(UISwipeGestureRecognizer *)recognizer{

if(recognizer.direction==UISwipeGestureRecognizerDirectionDown) {

       NSLog(@"swipe down");

//執行程式

}

if(recognizer.direction==UISwipeGestureRecognizerDirectionUp) {

       NSLog(@"swipe up");

//執行程式

}

if(recognizer.direction==UISwipeGestureRecognizerDirectionLeft) {

       NSLog(@"swipe left");

//執行程式

}

if(recognizer.direction==UISwipeGestureRecognizerDirectionRight) {

       NSLog(@"swipe right");

//執行程式

}

}

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