-(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");

//執行程序

}

if(recognizer.direction==UISwipeGestureRecognizerDirectionUp) {

NSLog(@"swipe up");

//執行程序

}

if(recognizer.direction==UISwipeGestureRecognizerDirectionLeft) {

NSLog(@"swipe left");

//執行程序

}

if(recognizer.direction==UISwipeGestureRecognizerDirectionRight) {

NSLog(@"swipe right");

//執行程序

}

}