[英]Loading UIViewController inside an UIScrollView Swift3
我有2個UIViewController
。 一個UIViewController
的視圖包含許多按鈕,高度為+2000點。 另一個UIViewController
具有UIScrollView
。
這是我的代碼:
import UIKit
class ViewController: UIViewController {
@IBOutlet weak var scrollView: UIScrollView!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
scrollView.contentSize = CGSize(width: 375, height: 2884)
DispatchQueue.main.async {
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let thumb_vc = storyboard.instantiateViewController(withIdentifier: "thumb") as! ThumbsViewController
//self.present(vc, animated: true, completion: nil)
self.addChildViewController(thumb_vc)
self.scrollView.addSubview(thumb_vc.view)
}
}
並且盡管UIViewController
拇指已加載到UIScrollView
,但是大小錯誤並且無法滾動。
任何幫助表示贊賞
在運行時加載視圖時,調整視圖的大小會遇到問題。 情侶選擇...
// NOT USING constraints / auto-layout
func setupA() -> Void {
scrollView.contentSize = CGSize(width: 375, height: 2884)
let storyboard = UIStoryboard(name: "Main", bundle: nil)
if let vc = storyboard.instantiateViewController(withIdentifier: "thumb") as? ThumbsViewController {
// add the child VC
self.addChildViewController(vc)
// don't let "thumbs" view auto-resize
vc.view.autoresizingMask = []
// set "thumbs" view frame size to scroll view content size
vc.view.frame = CGRect(origin: CGPoint.zero, size: scrollView.contentSize)
// add "thumbs" view to the scroll view
self.scrollView.addSubview(vc.view)
// finish child VC process
vc.didMove(toParentViewController: self)
}
}
// USING constraints / auto-layout, with hard-coded sizing
func setupB() -> Void {
let storyboard = UIStoryboard(name: "Main", bundle: nil)
if let vc = storyboard.instantiateViewController(withIdentifier: "thumb") as? ThumbsViewController {
// add the child VC
self.addChildViewController(vc)
// add "thumbs" view to the scroll view
self.scrollView.addSubview(vc.view)
// disable auto-resizing mask
vc.view.translatesAutoresizingMaskIntoConstraints = false
// set constraints to both control the size of the "thumbs" view
// as well as the contentSize of the scroll view
// set width and height constraints for the "thumbs" view
vc.view.widthAnchor.constraint(equalToConstant: 375).isActive = true
vc.view.heightAnchor.constraint(equalToConstant: 2884).isActive = true
// set leading, top, trailing, and bottom constraints to the scroll view
vc.view.leadingAnchor.constraint(equalTo: scrollView.leadingAnchor).isActive = true
vc.view.topAnchor.constraint(equalTo: scrollView.topAnchor).isActive = true
vc.view.trailingAnchor.constraint(equalTo: scrollView.trailingAnchor).isActive = true
vc.view.bottomAnchor.constraint(equalTo: scrollView.bottomAnchor).isActive = true
// finish child VC process
vc.didMove(toParentViewController: self)
}
}
// USING constraints / auto-layout, with sizing controlled by constraints set in IB for the "thumbs" view
func setupC() -> Void {
let storyboard = UIStoryboard(name: "Main", bundle: nil)
if let vc = storyboard.instantiateViewController(withIdentifier: "althumb") as? ALThumbsViewController {
// add the child VC
self.addChildViewController(vc)
// add "thumbs" view to the scroll view
self.scrollView.addSubview(vc.view)
// disable auto-resizing mask
vc.view.translatesAutoresizingMaskIntoConstraints = false
// the constraints set in Interface Builder for the elements in the "thumbs" view
// will control its size
// setting the "edge" constraints relative to the scroll view will control the contentSize
// set leading, top, trailing, and bottom constraints to the scroll view
vc.view.leadingAnchor.constraint(equalTo: scrollView.leadingAnchor).isActive = true
vc.view.topAnchor.constraint(equalTo: scrollView.topAnchor).isActive = true
vc.view.trailingAnchor.constraint(equalTo: scrollView.trailingAnchor).isActive = true
vc.view.bottomAnchor.constraint(equalTo: scrollView.bottomAnchor).isActive = true
// finish child VC process
vc.didMove(toParentViewController: self)
}
}
我建議在setupC()
使用該方法,該方法使用自動布局約束,並且沒有硬編碼的大小值。 使計划不同的設備尺寸(以及將來在其他視圖/應用/作業/等中使用)的規划變得更加容易。
當您可以使用Autolayout輕松將View嵌入滾動視圖時,為什么要給ScrollView賦予靜態高度。 您可以參考以下鏈接, https://www.natashatherobot.com/ios-autolayout-scrollview/
您還必須指定孩子的鏡框。 同樣,也無需在viewDidLoad
方法中將UI更改分派到主隊列。 並且,在將其視圖添加為子視圖之后,必須調用子視圖控制器的didMove(toParentViewController:)
方法。 您可以在此處閱讀有關容器視圖控制器及其子級的更多信息。
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