Question

我有两个TToolButton - ViewControllers＆amp; Slider。我将Foo添加为Slider Foo并在subview VC中设置其框架，但Foo的框架不会更改 - ＆gt;我只能看到Slider＆amp; x已应用。我应该如何更改代码才能使用y初始化Slider？或者，从Slider(initWithFrame: CGFrame) VC设置Slider的大小的首选方法是什么？

// slider.swift

Foo

// foo.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
    }
}

Answer 1

您的实施看起来有些问题。虽然看起来框架实际上并没有改变，但是你的视图不是剪切边界，所以看起来框架保持不变。

有几点需要注意。

首先，如果您要在代码中进行设置和布局，则需要在func'viewDidLayoutSubviews'中更新帧/位置。（看起来dfd也在评论中提到了这一点）

还要确保正确实现视图控制器包含。每当您尝试将一个视图控制器的视图添加到另一个视图控制器的视图时，您应该使用视图控制器包含。以下是该文档的链接：View Controller Containment Docs Here

根据Apple的说法，您应该实施最低限度的遏制措施如下:(您大部分时间都是正确的，但您的通话无序）

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个UIViewController扩展示例。

尝试以下代码，它在测试项目中为我工作：

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()
}

}

Swift：以编程方式从另一个VC设置VC帧

1 个答案: