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

}

}