Swift：以編程方式設置VC幀來自另一個VC

Question

我有兩個ViewControllers - Slider & Foo。 我加入Slider作爲Foosubview並設置它的內部Foo VC框架，但Slider的框架不會改變 - >我可以看到，只有x & y應用。我應該如何更改我的代碼以便能夠用Slider(initWithFrame: CGFrame)初始化Slider？或者從Foo VC設置大小Slider的首選方式是什麼？

// slider.swift

import UIKit 

class Slider: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout { 
    var collectionView: UICollectionView? 


    override func viewDidLoad() { 
     super.viewDidLoad() 

     let layout: UICollectionViewFlowLayout = UICollectionViewFlowLayout() 
     layout.minimumLineSpacing = 0 
     layout.sectionInset = UIEdgeInsets.zero 
     layout.itemSize = self.view.frame.size 
     layout.scrollDirection = UICollectionViewScrollDirection.horizontal 

     collectionView = UICollectionView(frame: self.view.frame, collectionViewLayout: layout) 
     collectionView?.dataSource = self 
     collectionView?.delegate = self 
     collectionView?.register(UICollectionViewCell.self, forCellWithReuseIdentifier: "Cell") 
     collectionView?.backgroundColor = UIColor.white 
     collectionView?.isPagingEnabled = true 

     self.view.addSubview(collectionView!) 
    } 

    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int { 
     return 14 
    } 

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell { 
     let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath) 
     cell.backgroundColor = UIColor.red 
     return cell 
    } 
} 

// foo.swift

import UIKit 

class Foo: UIViewController { 

    override func viewDidLoad() { 
     super.viewDidLoad() 

     slider = Slider(); 
     slider!.view.frame = CGRect(x: 50, y: 50, width: 20, height: 20) 
     self.view.addSubview(slider!.view) 
     self.addChildViewController(slider!) 
    } 

} 

Answer 1

它看起來像你有你的執行的幾個問題。雖然它看起來像框架沒有改變它實際上是，但你的觀點不剪裁到界限，所以看起來框架保持不變。

一些事情要注意。首先，如果您要設置代碼並進行佈局，則需要在func'viewDidLayoutSubviews'中更新幀/佈局。 （看起來像dfd在評論中也提到了這一點）

還要確保你正確地實現了視圖控制器遏制。無論何時您嘗試將一個視圖控制器的視圖添加到另一視圖控制器的視圖中，都應該使用視圖控制器包含。下面是該文檔的鏈接爲：View Controller Containment Docs Here

據蘋果公司應該實施遏制最低如下：（你得到它基本上是正確的，但你的電話是亂序）

func displayContentController(content: UIViewController) { 
    addChildViewController(content) 
    content.view.frame = frameForContentController() 
    view.addSubview(content.view) 
    content.didMoveToParentViewController(self) 
} 

我在下面的示例中包含了一個UIViewController擴展示例。

嘗試下面的代碼，它是爲我工作在一個測試項目：

，在跳出我

import UIKit 


class Slider: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout { 

var collectionView: UICollectionView? 
var layout : UICollectionViewFlowLayout? 

override func viewDidLoad() { 
    super.viewDidLoad() 

    layout = UICollectionViewFlowLayout() 
    layout?.minimumLineSpacing = 0 
    layout?.sectionInset = UIEdgeInsets.zero 
    layout?.itemSize = view.bounds.size 
    layout?.scrollDirection = UICollectionViewScrollDirection.horizontal 

    collectionView = UICollectionView(frame: view.bounds, collectionViewLayout: layout!) 
    collectionView?.dataSource = self 
    collectionView?.delegate = self 
    collectionView?.register(UICollectionViewCell.self, forCellWithReuseIdentifier: "Cell") 
    collectionView?.backgroundColor = UIColor.blue 
    collectionView?.isPagingEnabled = true 

    self.view.addSubview(collectionView!) 
} 

override func viewDidLayoutSubviews() { 

    // update layout item size here to your new view size 
    layout?.itemSize = view.bounds.size 
    // update collection view frame to new view size here 
    collectionView?.frame = view.bounds 

    super.viewDidLayoutSubviews() 
} 

func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int { 
    return 14 
} 

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell { 
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath) 
    cell.backgroundColor = UIColor.red 
    return cell 
} 
} 


class ViewController: UIViewController { 

override func viewDidLoad() { 
    super.viewDidLoad() 

    let slider = Slider() 

    // note clips to bounds here, avoids confusion as to where the frame is 
    slider.view.clipsToBounds = true 
    addChild(child: slider, frame: CGRect(x: 50, y: 50, width: 30, height: 30)) 
} 


} 


extension UIViewController { 

// MARK: View Controller Containment convenience functions 

func addChild(child:UIViewController, frame:CGRect) { 
    // notify child of containment 
    child.willMove(toParentViewController: self) 

    // add content as child 
    self.addChildViewController(child) 

    // set frame of child content 
    child.view.frame = frame 

    // add childs view to hierarchy 
    self.view.addSubview(child.view) 

    // call containment delegate 
    child.didMove(toParentViewController: self) 
} 

/* 
* Call this function on a child view controller to remove it from it's parent controller and dismiss it. 
*/ 
func remove(fromParentWithAnimationDuration animationDuration:TimeInterval) 
{ 
    // notify child it's being removed 
    self.willMove(toParentViewController: nil) 

    // remove the view 
    self.view.removeFromSuperview() 

    // remove child controller from container 
    self.removeFromParentViewController() 
} 

}