如何使用UIPangestureRecognitor移动对象？iPhone/iPad

有几个

UIPangestureRecognitor

类的示例。例如，我已经阅读，但我仍然无法使用它

在我正在处理的nib文件上，我有一个

UIView

（图像上的白色矩形），我希望与该类一起拖动：

在我的.m文件中，我放置了：

- (void)setTranslation:(CGPoint)translation inView:(UIView *)view
{
    NSLog(@"Test to see if this method gets executed");
}

当我在

UIView

上拖动鼠标时，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*）toucheevent:（UIEvent*）event

方法一样工作，我只需要放置那个方法，只要有触碰就会调用它

我做错了什么？也许我必须和那个方法有联系？如果是这样，我该怎么做

我找到了教程，我想这就是我想要的。它帮助我想出了以下解决方案：

-(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];
    }
}

-（iAction）方法{
UIPangestureRecognitzer*PanRecognitzer=[[UIPangestureRecognitzer alloc]initWithTarget:自操作：@selector（move:）]；
[装甲识别器设置最小接触次数：1]；
[装甲识别器设置最大接触次数：1]；
[ViewMain ADDGESTURE识别器：装甲识别器]；
[装甲识别器释放]；
}
-（无效）移动：（UIPangestureRecognitor*）发送方{
[self.view将subviewTofront:sender.view]；
CGPoint translatedPoint=[sender TranslationView:sender.view.superview]；
if（sender.state==UIgestureRecognitizerStateStart）{
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设置中心：translatedPoint]；
[sender setTranslation:CGPointZero-inView:sender.view]；
if（sender.state==UIGestureRecognitizerStateEnded）{
CGFloat-velocityX=（0.2*[sender-velocityview:self.view].x）；
CGFloat-velocityY=（0.2*[sender-velocityview:self.view].y）；
CGFloat finalX=平移点.x+速度x；
CGFloat finalY=translatedPoint.y+velocityY；//translatedPoint.y+（.35*[（UIPangestureRecognitizer*）发送方速度视图：self.view].y）；
如果（finalX<0）{
finalX=0；
}else if（finalX>self.view.frame.size.width）{
finalX=self.view.frame.size.width；
}
如果（最终<50）{//避免状态栏
最终=50；
}else if（最终>self.view.frame.size.height）{
finalY=self.view.frame.size.height；
}
CGFloat animationDuration=（绝对速度）*.0002）+.2；
NSLog（@“持续时间为：%f”，animationDuration）；
[UIView beginAnimations:nil上下文：NULL]；
[UIView setAnimationDuration:animationDuration]；
[UIView设置动画曲线：UIViewAnimationCurveEaseOut]；
[UIView setAnimationDelegate:self]；
[UIView setAnimationDidStopSelector:@selector（animationDidFinish）]；
[[sender view]设置中心：CGPointMake（finalX，finalY）]；
[UIView委员会]；
}
}

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")
}

---

@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)
}

---

几年后，我把帽子扔进了拳击场

需要保存图像视图的起始中心：

var panBegin: CGPoint.zero

然后使用变换更新新中心：

if recognizer.state == .began {
     panBegin = imageView!.center

} else if recognizer.state == .ended {
    panBegin = CGPoint.zero

} else if recognizer.state == .changed {
    let translation = recognizer.translation(in: view)
    let panOffsetTransform = CGAffineTransform( translationX: translation.x, y: translation.y)

    imageView!.center = panBegin.applying(panOffsetTransform)
}

---

太神了我喜欢计算动画持续时间，效果很好。如果您将move:（id）sender更改为move:（UIPangestureRecognitizer*）sender，则不必进行所有难看的打字。此解决方案不适用于UISwitch。我还尝试实现touchesbreated、touchesMoved方法，但无法移动UISwitch。您能告诉我如何通过拖动来移动UI开关吗？记住对于与手势识别器关联的视图，要让userInteractionEnabled=YES。firstX和firstY是什么？对于

CGPointMake（0，0）

你可以写

CGRectZero

@意思很重要，你不是说

CGRectZero

？@mylogon你完全正确。我会把你的一些回答作为我的感谢。完美无缺的胜利！这种简单性无可争议，但这种解决方案有一个问题：只要你放下手指开始做手势，

image1

就会跳起来，可能跳得很远，以至于它的中心在你的手指下。最好通过

pan

的翻译来调整

image1.center

，以获得更流畅、更标准的体验。

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)
}

var panBegin: CGPoint.zero

if recognizer.state == .began {
     panBegin = imageView!.center

} else if recognizer.state == .ended {
    panBegin = CGPoint.zero

} else if recognizer.state == .changed {
    let translation = recognizer.translation(in: view)
    let panOffsetTransform = CGAffineTransform( translationX: translation.x, y: translation.y)

    imageView!.center = panBegin.applying(panOffsetTransform)
}