滾動的UITableView向上滑動至屏幕的頂部斯威夫特

Question

我想創建一個非常簡單的佈局，類似條紋的iOS應用程序有哪些，你可以在這裏看到：https://stripe.com/img/dashboard_iphone/screencast.mp4

在圍繞0：06S表視圖刷卡它會移動到窗口的頂部。

是否有任何雨燕簡單的指令，顯示這種設計模式我看到它無處不在，但不知道如何創建它

Answer 1

1. 添加一個UIView
2. 子類的UIView與自定義類

在您自定義的UIView，你需要幾個變量和幾個覆蓋。確保用戶交互在你的故事板的UIView的啓用，然後在您的自定義類加載：

var startPosition: CGPoint? 
var originalHeight: CGFloat? 

之後，添加以下內容：

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) { 
    let touch = touches.first 
    startPosition = touch?.locationInView(self) 
    originalHeight = self.frame.height 
} 

override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) { 
    let touch = touches.first 
    let endPosition = touch?.locationInView(self) 
    let difference = endPosition!.y - startPosition!.y 
    let newFrame = CGRectMake(self.frame.origin.x, self.frame.origin.y + difference, self.frame.width, self.frame.height - difference) 
    self.frame = newFrame 
} 

override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) { 

} 

Answer 2

在UIScrollView.h：

// When the user taps the status bar, the scroll view beneath the touch which is closest to the status bar will be scrolled to top, but only if its `scrollsToTop` property is YES, its delegate does not return NO from `shouldScrollViewScrollToTop`, and it is not already at the top. 
// On iPhone, we execute this gesture only if there's one on-screen scroll view with `scrollsToTop` == YES. If more than one is found, none will be scrolled. 
var scrollsToTop: Bool // default is YES. 

初始化滾動視圖的委託（除非你已經有了，可能在你的viewDidLoad中），然後將其設置爲true。

像這樣：

myScrollView.scrollsToTop = true 

如果你想確保你的滾動視圖委託允許這一點，從UIScrollViewDelegate的協議檢查這個方法：

optional func scrollViewShouldScrollToTop(scrollView: UIScrollView) -> Bool // return a yes if you want to scroll to the top. if not defined, assumes YES 

請評論的任何問題。