上下左右手势

-(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");
//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
}
}