iPhone：设置所需的滑动手势长度
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我想知道是否有一种简单的方法来设置最小滑动长度，即用户需要滑动以将手势识别为滑动的像素长度。
我注意到普通的滑动操作可能没有反应（例如，与在照片库中滑动照片相比）。
这是正常的方式，但是我想减少所需的滑动长度：
- (void)viewDidLoad
{
// SWIPING GESTURES:
UISwipeGestureRecognizer *swipeLeftRecognizer;
swipeLeftRecognizer=[[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(foundLeftSwipe:)];
swipeLeftRecognizer.direction=UISwipeGestureRecognizerDirectionLeft;
//swipeRecognizer.numberOfTouchesRequired=1;
[self.view addGestureRecognizer:swipeLeftRecognizer];
[swipeLeftRecognizer release];
UISwipeGestureRecognizer *swipeRightRecognizer;
swipeRightRecognizer=[[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(foundRightSwipe:)];
swipeRightRecognizer.direction=UISwipeGestureRecognizerDirectionRight;
//swipeRecognizer.numberOfTouchesRequired=1;
[self.view addGestureRecognizer:swipeRightRecognizer];
[swipeRightRecognizer release];
[super viewDidLoad];
}
#pragma mark -
#pragma mark Swipes
- (void)foundLeftSwipe:(UISwipeGestureRecognizer *)recognizer {
// do something
}
- (void)foundRightSwipe:(UISwipeGestureRecognizer *)recognizer {
// do something
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
gestureStartPoint = [touch locationInView:self.view];
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
CGPoint currentPosition = [touch locationInView:self.view];
CGFloat deltaXX = (gestureStartPoint.x - currentPosition.x); // positive = left, negative = right
CGFloat deltaYY = (gestureStartPoint.y - currentPosition.y); // positive = up, negative = down
CGFloat deltaX = fabsf(gestureStartPoint.x - currentPosition.x); // will always be positive
CGFloat deltaY = fabsf(gestureStartPoint.y - currentPosition.y); // will always be positive
if (deltaX >= kMinimumGestureLength && deltaY <= kMaximumVariance) {
if (deltaXX > 0) {
label.text = @\"Horizontal Left swipe detected\";
[self performSelector:@selector(eraseText) withObject:nil afterDelay:2];
}
else {
label.text = @\"Horizontal Right swipe detected\";
[self performSelector:@selector(eraseText) withObject:nil afterDelay:2];
}
}
if (deltaY >= kMinimumGestureLength && deltaX <= kMaximumVariance) {
if (deltaYY > 0) {
label.text = @\"Vertical up swipe detected\";
[self performSelector:@selector(eraseText) withObject:nil afterDelay:2];
}
else {
label.text = @\"Vertical down swipe detected\";
[self performSelector:@selector(eraseText) withObject:nil afterDelay:2];
}
}
}
没有找到相关结果
已邀请:
4 个回复
缮淳彼誊
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event UITouch *touch = [touches anyObject]; gestureStartPoint = [touch locationInView:self.view]; } - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = [touches anyObject]; CGPoint gestureEndPoint = [touch locationInView:self.view]; // compare gestureStartPoint and gestureEndPoint to determine swipe length }催备南菠亨
中没有所需的距离，但这并不是您可以使用的全部。我最终用了！它看起来像是手势手势识别器的超类，并且肯定会公开更多有用的数据。 此类中有一个名为的方法，该方法返回CGPoint，其中x＆y是整个平移手势的总距离！对于我们的要求来说，有些有用的东西！并且它以正负值表示方向，即：y = + 100->向下滑动100点，x = + 100左右滑动100点，依此类推... 我正在做的是检查用户是否已平移给定的点数（我正在寻找向下滑动的内容，所以对我来说是y> 150），然后执行我的操作... 这是一些代码摘录：-(void)viewDidLoad { UIPanGestureRecoginzer *panDown=[[UIPanGestureRecoginzer alloc] initWithTarget:self action:@selector(swipedDown:)]; [self.view addGestureRecognizer:panDown]; } . . . -(void)swipedDown:(UIPanGestureRecoginzer *)recognizer { CGPoint panned=[recognizer translationInView:self.view]; if(panned.y>150){ //swiped down for 150 points doSomething(); } }注意：如果要获得整体平移效果，则应使用超级视图（大多数情况下为self.view）。 希望对您有所帮助：UIPanGestureRecognize类参考玩翁文醚碱
悸翠疮武昏
var gestureStartPoint: CGPoint = .zero override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) { let touch = touches.first gestureStartPoint = touch!.location(in: self.view) } override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) { let touch = touches.first let gestureEndPoint = touch!.location(in: self.view) let dist = distance(gestureStartPoint, gestureEndPoint) print(dist) } func distance(_ a: CGPoint, _ b: CGPoint) -> CGFloat { let xDist = a.x - b.x let yDist = a.y - b.y return CGFloat(sqrt((xDist * xDist) + (yDist * yDist))) }