我需要检测我的滑动手势的方向,我有问题。手势正在工作,但我不知道如何检测方向。 ......
swipeGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(detectSwipe:)];
[swipeGesture setNumberOfTouchesRequired:1];
[swipeGesture setDirection:UISwipeGestureRecognizerDirectionDown | UISwipeGestureRecognizerDirectionUp];
[appView addGestureRecognizer:swipeGesture];
-(void)detectSwipe:(UISwipeGestureRecognizer *)recognizer {
switch (recognizer.direction) {
case UISwipeGestureRecognizerDirectionUp:
NSLog(@"smth1");
break;
case UISwipeGestureRecognizerDirectionDown:
NSLog(@"smth2");
default:
break;
}
}
它不起作用:/
答案 0 :(得分:49)
以下是我的一个项目的示例:
// ...
UISwipeGestureRecognizer *swipeLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(didSwipe:)];
swipeLeft.direction = UISwipeGestureRecognizerDirectionLeft;
[self.view addGestureRecognizer:swipeLeft];
UISwipeGestureRecognizer *swipeRight = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(didSwipe:)];
swipeRight.direction = UISwipeGestureRecognizerDirectionRight;
[self.view addGestureRecognizer:swipeRight];
UISwipeGestureRecognizer *swipeUp = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(didSwipe:)];
swipeUp.direction = UISwipeGestureRecognizerDirectionUp;
[self.view addGestureRecognizer:swipeUp];
UISwipeGestureRecognizer *swipeDown = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(didSwipe:)];
swipeDown.direction = UISwipeGestureRecognizerDirectionDown;
[self.view addGestureRecognizer:swipeDown];
// ...
- (void)didSwipe:(UISwipeGestureRecognizer*)swipe{
if (swipe.direction == UISwipeGestureRecognizerDirectionLeft) {
NSLog(@"Swipe Left");
} else if (swipe.direction == UISwipeGestureRecognizerDirectionRight) {
NSLog(@"Swipe Right");
} else if (swipe.direction == UISwipeGestureRecognizerDirectionUp) {
NSLog(@"Swipe Up");
} else if (swipe.direction == UISwipeGestureRecognizerDirectionDown) {
NSLog(@"Swipe Down");
}
}
答案 1 :(得分:20)
direction
属性仅定义被识别为滑动的允许的方向,而不是特定滑动的实际方向。
最简单的方法是使用两个独立的手势识别器。您还可以在手势开始时以及以locationInView:
方法结束时检查触摸的位置。
答案 2 :(得分:11)
扩展omz的解决方案:
self.myView
是我想要设置手势识别器的视图。下面的代码未经过测试,我想最好将识别器保持为property
并将其添加到viewDidLoad()
或xib
文件中。 self
是UIViewController
。
UISwipeGestureRecognizer *swipeLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipedLeft:)];
[swipeLeft setDirection:UISwipeGestureRecognizerDirectionLeft ];
[self.view addGestureRecognizer:swipeLeft];
UISwipeGestureRecognizer *swipeRight = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipedRight:)];
[swipeRight setDirection:UISwipeGestureRecognizerDirectionRight ];
[self.view addGestureRecognizer:swipeRight];
将这两种方法添加到UIViewController
并添加必要的操作:
- (IBAction)swipedRight:(UISwipeGestureRecognizer *)recognizer
{
NSLog(@"swiped right");
}
- (IBAction)swipedLeft:(UISwipeGestureRecognizer *)recognizer
{
NSLog(@"swiped left");
}
答案 3 :(得分:0)
使用Swift 5滑动手势方向检测
override func viewDidLoad() {
super.viewDidLoad()
let leftSwipe = UISwipeGestureRecognizer(target: self, action: #selector(handleSwipes(_:)))
let rightSwipe = UISwipeGestureRecognizer(target: self, action: #selector(handleSwipes(_:)))
leftSwipe.direction = .left
rightSwipe.direction = .right
view.addGestureRecognizer(leftSwipe)
view.addGestureRecognizer(rightSwipe)
}
@objc func handleSwipes(_ sender:UISwipeGestureRecognizer) {
if (sender.direction == .left) {
print("Swipe Left")
}
if (sender.direction == .right) {
print("Swipe Right")
}
}