UIView.animateWithDuration 或 UIScrollView.animateWithDuration - 如何在当前状态暂停

Posted 2023-03-16

【中文标题】UIView.animateWithDuration 或 UIScrollView.animateWithDuration - 如何在当前状态暂停

【英文标题】：UIView.animateWithDuration or UIScrollView.animateWithDuration - how to pause at current status

【发布时间】：2015-01-22 10:18:55

【问题描述】：

我正在使用这些（代码块 1 和 2）将带有动画的 UIScrollView 从开始移动到我的结束点 （在本例中，x：0 到 1000）

代码块 1：

UIScrollView.animateWithDuration(Double(5), delay: 1, options: (UIViewAnimationOptions.AllowUserInteraction | UIViewAnimationOptions.CurveLinear | UIViewAnimationOptions.BeginFromCurrentState),
                            animations: 
self.myScrollView.contentOffset = CGPointMake(1000, 0)
                            ,
                            completion: 
                                finished in
                                if(finished)
                                

                                
                        )

代码块 2：

UIView.animateWithDuration ...

问题是不能在当前x点暂停。

我已经尝试过了，但对我不起作用。

导入 QuartzCore 框架 self.myScrollView.layer.beginTime = 0.0 完成

CATransaction.begin() 和 CATransaction.commit()

self.myScrollView.layer.removeAllAnimations()。这会完全停止动画，然后 UIScrollView 将到达 endPoint（到 x:1000）

另外animateWithDuration是取消scrollViewDidScroll，所以无法获取当前位置。另外，同样的原因，在暂停功能中无法获取当前位置。

func scrollViewDidScroll(scrollView: UIScrollView)

scrollView.bounds.origin.x
var pos:CGPoint = self.layer.presentationLayer().bounds.origin


func StopSlidingByBeginDragging()

CATransaction.begin() 
self.myScrollView.layer.removeAllAnimations()
CATransaction.commit()

基本上，当我手动触摸或滚动 UIScrollView 时，我需要暂停它应该暂停然后恢复。我发现这个动画是滑动动画，也许你可以提出一些不同的建议。

谢谢

【参考方案1】：

试试这个自定义的UIScrollView 类以及UIViewController 代码。

class TouchScrollView : UIScrollView

    var animatedScrollOffset = CGPointMake(0, 0)

    func startAnimation()
    
        UIScrollView.animateWithDuration(Double(5), delay: 1,
            options: (UIViewAnimationOptions.AllowUserInteraction
                | UIViewAnimationOptions.CurveLinear |
                UIViewAnimationOptions.BeginFromCurrentState),
            animations: 
                self.contentOffset = self.animatedScrollOffset
            ,
            completion: 
                finished in
                if !finished 

                
        )

    

    func stopAnimation()
    
        let offset = self.layer.presentationLayer().bounds.origin
        self.layer.removeAllAnimations()
        self.contentOffset = offset
    

    override init(frame: CGRect) 
        super.init(frame: frame)

       if let gestures = self.gestureRecognizers
        
            for gestureRecognizer in gestures
            
                if let swipeRecognizer = gestureRecognizer as? UIGestureRecognizer
                
                    swipeRecognizer.cancelsTouchesInView = false
                
            
        
    

    required init(coder aDecoder: NSCoder) 
        super.init(coder: aDecoder)
    
    override func touchesBegan(touches: NSSet, withEvent event: UIEvent) 
        self.stopAnimation()
    

    override func touchesEnded(touches: NSSet, withEvent event: UIEvent) 
        self.startAnimation()
    



class ViewController: UIViewController, UITextViewDelegate,UIScrollViewDelegate 

    @IBOutlet var scrollView : TouchScrollView!

    override func viewDidLoad() 

        scrollView.contentSize = CGSizeMake(scrollView.frame.width, 10000)
        scrollView.backgroundColor = UIColor.redColor()
        scrollView.showsVerticalScrollIndicator = true
        scrollView.showsHorizontalScrollIndicator = true
        scrollView.animatedScrollOffset = CGPointMake(0, 1000)
        scrollView.startAnimation()
        scrollView.delegate = self
    

    func scrollViewWillBeginDragging(_: UIScrollView) 
        println("begin dragging")
        scrollView.stopAnimation()
    

    func scrollViewDidEndDragging(_ : UIScrollView, willDecelerate decelerate: Bool) 
        println("end dragging")
        if !decelerate
        
            scrollView.startAnimation()
        
    

    func scrollViewDidEndDecelerating(_ : UIScrollView) 
        scrollView.startAnimation()