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iOS 上下左右手势识别

醉东枫 2022-08-06 阅读 94


- (void)viewDidLoad
{
//建立滑动手势
UISwipeGestureRecognizer *recognizer;
recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)];
//设置滑动方向,下面以此类推
[recognizer setDirection:(UISwipeGestureRecognizerDirectionRight)];
[[self view] addGestureRecognizer:recognizer];

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

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

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

[super viewDidLoad];
}

//这个是协议回调,所以需要遵循 UIGestureRecognizerDelegate协议
-(void)handleSwipeFrom:(UISwipeGestureRecognizer *)recognizer {
NSLog(@"Swipe received.");
if (recognizer.direction==UISwipeGestureRecognizerDirectionDown) {
NSLog(@"向下滑动");
//执行程序
}
if (recognizer.direction==UISwipeGestureRecognizerDirectionUp) {

NSLog(@"向上滑动");
//执行程序
}
if (recognizer.direction==UISwipeGestureRecognizerDirectionLeft) {

NSLog(@"向左滑动");
//执行程序
}
if (recognizer.direction==UISwipeGestureRecognizerDirectionRight) {

NSLog(@"向右滑动");
//执行程序
}
}

 

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