如何使用UIPanGestureRecognizer移动对象？ iPhone / iPad版
有几个UIPanGestureRecognizer类的例子。 例如，我读过这个 ，我仍然无法使用它…
在我正在处理的笔尖文件上，我有一个UIView （图像上的白色矩形），我想用该类拖动：
并在我的.m文件中，我已经放置：
- (void)setTranslation:(CGPoint)translation inView:(UIView *)view { NSLog(@"Test to see if this method gets executed"); }
当我拖动鼠标穿过UIView时，该方法不会执行。 我也尝试过放置：
- (void)pan:(UIPanGestureRecognizer *)gesture { NSLog(@"testing"); }
而且该方法也不会被执行。 也许我错了，但我认为这个方法应该像- (void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event方法，我只需要放置该方法，每当有触摸时它将被调用。
我究竟做错了什么？ 也许我必须绘制一个连接到该方法？ 如果是这样，我该怎么做？
我find了使用UIGestureRecognizers的教程，我想这就是我正在寻找的。 它帮助我拿出以下解决scheme：
-(IBAction) someMethod { UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(move:)]; [panRecognizer setMinimumNumberOfTouches:1]; [panRecognizer setMaximumNumberOfTouches:1]; [ViewMain addGestureRecognizer:panRecognizer]; [panRecognizer release]; } -(void)move:(UIPanGestureRecognizer*)sender { [self.view bringSubviewToFront:sender.view]; CGPoint translatedPoint = [sender translationInView:sender.view.superview]; if (sender.state == UIGestureRecognizerStateBegan) { firstX = sender.view.center.x; firstY = sender.view.center.y; } translatedPoint = CGPointMake(sender.view.center.x+translatedPoint.x, sender.view.center.y+translatedPoint.y); [sender.view setCenter:translatedPoint]; [sender setTranslation:CGPointZero inView:sender.view]; if (sender.state == UIGestureRecognizerStateEnded) { CGFloat velocityX = (0.2*[sender velocityInView:self.view].x); CGFloat velocityY = (0.2*[sender velocityInView:self.view].y); CGFloat finalX = translatedPoint.x + velocityX; CGFloat finalY = translatedPoint.y + velocityY;// translatedPoint.y + (.35*[(UIPanGestureRecognizer*)sender velocityInView:self.view].y); if (finalX < 0) { finalX = 0; } else if (finalX > self.view.frame.size.width) { finalX = self.view.frame.size.width; } if (finalY < 50) { // to avoid status bar finalY = 50; } else if (finalY > self.view.frame.size.height) { finalY = self.view.frame.size.height; } CGFloat animationDuration = (ABS(velocityX)*.0002)+.2; NSLog(@"the duration is: %f", animationDuration); [UIView beginAnimations:nil context:NULL]; [UIView setAnimationDuration:animationDuration]; [UIView setAnimationCurve:UIViewAnimationCurveEaseOut]; [UIView setAnimationDelegate:self]; [UIView setAnimationDidStopSelector:@selector(animationDidFinish)]; [[sender view] setCenter:CGPointMake(finalX, finalY)]; [UIView commitAnimations]; } }
UIPanGestureRecognizer * pan1 = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(moveObject:)]; pan1.minimumNumberOfTouches = 1; [image1 addGestureRecognizer:pan1]; -(void)moveObject:(UIPanGestureRecognizer *)pan; { image1.center = [pan locationInView:image1.superview]; }
-(IBAction)Method { UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePan:)]; [panRecognizer setMinimumNumberOfTouches:1]; [panRecognizer setMaximumNumberOfTouches:1]; [ViewMain addGestureRecognizer:panRecognizer]; [panRecognizer release]; } - (Void)handlePan:(UIPanGestureRecognizer *)recognizer { CGPoint translation = [recognizer translationInView:self.view]; recognizer.view.center = CGPointMake(recognizer.view.center.x + translation.x, recognizer.view.center.y + translation.y); [recognizer setTranslation:CGPointMake(0, 0) inView:self.view]; if (recognizer.state == UIGestureRecognizerStateEnded) { CGPoint velocity = [recognizer velocityInView:self.view]; CGFloat magnitude = sqrtf((velocity.x * velocity.x) + (velocity.y * velocity.y)); CGFloat slideMult = magnitude / 200; NSLog(@"magnitude: %f, slideMult: %f", magnitude, slideMult); float slideFactor = 0.1 * slideMult; // Increase for more of a slide CGPoint finalPoint = CGPointMake(recognizer.view.center.x + (velocity.x * slideFactor), recognizer.view.center.y + (velocity.y * slideFactor)); finalPoint.x = MIN(MAX(finalPoint.x, 0), self.view.bounds.size.width); finalPoint.y = MIN(MAX(finalPoint.y, 0), self.view.bounds.size.height); [UIView animateWithDuration:slideFactor*2 delay:0 options:UIViewAnimationOptionCurveEaseOut animations:^{ recognizer.view.center = finalPoint; } completion:nil]; } }
if ([recognizer state] == UIGestureRecognizerStateChanged) { CGPoint translation1 = [recognizer translationInView:main_view]; img12.center=CGPointMake(img12.center.x+translation1.x, img12.center.y+ translation1.y); [recognizer setTranslation:CGPointMake(0, 0) inView:main_view]; recognizer.view.center=CGPointMake(recognizer.view.center.x+translation1.x, recognizer.view.center.y+ translation1.y); } -(void)move:(UIPanGestureRecognizer*)recognizer { if ([recognizer state] == UIGestureRecognizerStateChanged) { CGPoint translation = [recognizer translationInView:self.view]; recognizer.view.center=CGPointMake(recognizer.view.center.x+translation.x, recognizer.view.center.y+ translation.y); [recognizer setTranslation:CGPointMake(0, 0) inView:self.view]; } }
@MS AppTech答案的swift 2版本
func handlePan(panGest : UIPanGestureRecognizer) { let velocity : CGPoint = panGest.velocityInView(self.view); let magnitude : CGFloat = CGFloat(sqrtf((Float(velocity.x) * Float(velocity.x)) + (Float(velocity.y) * Float(velocity.y)))); let slideMult :CGFloat = magnitude / 200; //NSLog(@"magnitude: %f, slideMult: %f", magnitude, slideMult); let slideFactor : CGFloat = 0.1 * slideMult; // Increase for more of a slide var finalPoint : CGPoint = CGPointMake(panGest.view!.center.x + (velocity.x * slideFactor), panGest.view!.center.y + (velocity.y * slideFactor)); finalPoint.x = min(max(finalPoint.x, 0), self.view.bounds.size.width); finalPoint.y = min(max(finalPoint.y, 0), self.view.bounds.size.height); UIView.animateWithDuration(Double(slideFactor*2), delay: 0, options: UIViewAnimationOptions.CurveEaseOut, animations: { panGest.view!.center = finalPoint; }, completion: nil) }
Swift 2版本：
// start detecting pan gesture let panGestureRecognizer = UIPanGestureRecognizer(target: self, action: #selector(TTAltimeterDetailViewController.panGestureDetected(_:))) panGestureRecognizer.minimumNumberOfTouches = 1 self.chartOverlayView.addGestureRecognizer(panGestureRecognizer) func panGestureDetected(panGestureRecognizer: UIPanGestureRecognizer) { print("pan gesture recognized") }
