此篇文章將要介紹Swift_ScrollView _ API詳解的相關介紹，具體實例請看下文

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class ViewController: UIViewController,UIScrollViewDelegate {
    
    var scrollView = UIScrollView()
    var imageView = UIImageView()
    var image = UIImage()
    
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        self.image = UIImage.init(named: "test")!
        self.imageView.image = self.image
        
        self.view.backgroundColor = UIColor.green
        self.view.addSubview(self.scrollView)// 將ScrollView添加到視圖上
        
        let width = self.view.bounds.size.width * 2
        let height = self.view.bounds.size.height * 2
        
        self.scrollView.frame = self.view.bounds // 設置scrollView的 frame
        self.scrollView.contentSize = CGSize(width:width, height:height) //設置scrollView的 contentSize
        self.scrollView.delegate = self // 設置scrollView的 代理
        
        
        print(self.scrollView.contentOffset) // scrollView左頂點的位置 可設置
        print(self.scrollView.contentInset) // scrollView 添加額外的滾動附近區域的內容 可設置
        self.scrollView.isDirectionalLockEnabled = true
        print(self.scrollView.isDirectionalLockEnabled) // 鎖定垂直或水平滾動 可設置
        print(self.scrollView.bounces) // scrollView 回彈效果 可設置
        print(self.scrollView.alwaysBounceVertical) // 垂直回彈 可設置
        print(self.scrollView.alwaysBounceHorizontal) // 水平回彈 可設置
        print(self.scrollView.isPagingEnabled) // 分頁 可設置
        print(self.scrollView.isScrollEnabled) // 滾動 可設置
        print(self.scrollView.showsHorizontalScrollIndicator) // 顯示水平滾動條
        print(self.scrollView.showsVerticalScrollIndicator) // 顯示垂直滾動條
        print(self.scrollView.scrollIndicatorInsets) // 調整指標insets的內部
        print(self.scrollView.indicatorStyle) // black with white border. good against any background
        print(self.scrollView.decelerationRate) // 減速速度
        
        //open func setContentOffset(_ contentOffset: CGPoint, animated: Bool) 設置 contentOffset
        //open func scrollRectToVisible(_ rect: CGRect, animated: Bool) 這個方法需要傳入一個Rect 這個rect可以理解成在scrollview.contentView中frame 調用這個方法就會滾到rect所在的那個區域去
        //open func FlashScrollIndicators() 短暫地顯示滾動指示器 你應該在把滾動視圖放在最前端時調用此方法。
        
        
        /*
         
         open var isTracking: Bool { get } // returns YES if user has touched. may not yet have started dragging
         
         open var isDragging: Bool { get } // returns YES if user has started scrolling. this may require some time and or distance to move to initiate dragging
         
         open var isDecelerating: Bool { get } // returns YES if user isn't dragging (touch up) but scroll view is still moving
         
         
         open var delaysContentTouches: Bool // default is YES. if NO, we immediately call -touchesShouldBegin:withEvent:inContentView:. this has no effect on presses
         
         open var canCancelContentTouches: Bool // default is YES. if NO, then once we start tracking, we don't try to drag if the touch moves. this has no effect on presses
         */
        
        //父視圖是否可以將消息傳遞給子視圖 yes是將事件傳遞給子視圖 則不滾動 no是不傳遞則繼續滾動
        //open func touchesShouldBegin(_ touches: Set<UITouch>, with event: UIEvent?, in view: UIView) -> Bool
        
        //父視圖是否可以將消息傳遞給子視圖 yes是將事件傳遞給子視圖 則不滾動 no是不傳遞則繼續滾動
        //open func touchesShouldCancel(in view: UIView) -> Bool
        
        print(self.scrollView.minimumZoomScale) // 最小的變焦比例 可設置
        print(self.scrollView.maximumZoomScale) // 最大的變焦比例 可設置
        print(self.scrollView.zoomScale) // 當前的變焦比例
        
        //open func setZoomScale(_ scale: CGFloat, animated: Bool) 設置變焦比例
        //open func zoom(to rect: CGRect, animated: Bool)
        
        print(self.scrollView.bouncesZoom)
        print(self.scrollView.isZooming)
        print(self.scrollView.isZoomBouncing)
        print(self.scrollView.scrollsToTop) //當用戶點擊狀態欄時 是否滾動到頂部
        
        //panGestureRecognizer 拖動手勢
        //pinchGestureRecognizer 變焦手勢
        
        //keyboardDismissMode 鍵盤消失形式
        //refreshControl
        
        self.imageView.frame = CGRect(origin:CGPoint(x:0, y:0),size:CGSize(width:width, height:height))
        self.scrollView.addSubview(self.imageView)
        
    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
    
    /// MARK: UIScrollViewDelegate 代理
    func scrollViewDidScroll(_ scrollView: UIScrollView) {
        print("scrollViewDidScroll:scrollView 在滾動")
    }
    func scrollViewDidZoom(_ scrollView: UIScrollView) {
        print("scrollViewDidZoom:scrollView 在改變變焦比例")
    }
    func scrollViewWillBeginDragging(_ scrollView: UIScrollView) {
        print("scrollViewWillBeginDragging:scrollView 即將被拖拽")
    }
    func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {
        print("scrollViewWillEndDragging:scrollView 即將結束拖拽")
    }
    func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool) {
        print("scrollViewDidEndDragging:scrollView 已經結束拖拽")
    }
    func scrollViewWillBeginDecelerating(_ scrollView: UIScrollView) {
        print("scrollViewWillBeginDecelerating:scrollView 即將開始減速")
    }
    func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
        print("scrollViewDidEndDecelerating:scrollView 已經開始減速")
    }
    func scrollViewDidEndScrollingAnimation(_ scrollView: UIScrollView) {
        print("scrollViewDidEndScrollingAnimation:scrollView 已經結束動畫")
    }
    func viewForZooming(in scrollView: UIScrollView) -> UIView? {
        print("viewForZooming:scrollView 返回視圖(viewForZooming)")
        return nil
    }
    func scrollViewWillBeginZooming(_ scrollView: UIScrollView, with view: UIView?) {
        print("scrollViewWillBeginZooming:scrollView 即將開始變焦")
    }
    func scrollViewDidEndZooming(_ scrollView: UIScrollView, with view: UIView?, atScale scale: CGFloat) {
        print("scrollViewDidEndZooming:scrollView 已經結束變焦")
    }
    func scrollViewShouldScrollToTop(_ scrollView: UIScrollView) -> Bool {
        print("scrollViewShouldScrollToTop:scrollView 即將回滾到頂部")
        return true
    }
    func scrollViewDidScrollToTop(_ scrollView: UIScrollView) {
        print("scrollViewShouldScrollToTop:scrollView 已經回滾到頂部")
    }
}

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