滚动视图不工作 ios

Question

我的 ScrollView 包含一个容器视图，它又具有一个 textView，其高度取决于内容并且是动态的。我已经为 textview 启用了滚动，但它似乎不起作用。我试图设置内容大小即使在 viewDidLayouts 中也可以滚动视图，但这也不起作用。 代码如下：

import UIKit

class DiaryViewViewController: UIViewController, UITextViewDelegate, UIScrollViewDelegate, TagListViewDelegate {

var scrollView: UIScrollView!
var containerView = UIView()
let diaryDate = UITextView()
var tagListView: TagListView!
var assets: [DKAsset]?
var diaryEntryText = UITextView()

override func viewDidLoad() {
    super.viewDidLoad()

    self.scrollView = UIScrollView()
    self.scrollView.delegate = self
    containerView = UIView()
    self.scrollView.delegate = self
    scrollView.isDirectionalLockEnabled = true
    containerView.translatesAutoresizingMaskIntoConstraints = false

    //to fetch height of screen
    let screenSize = UIScreen.main.bounds
    let width = screenSize.width
    let height = screenSize.height


    //Top Bar
    let topBar = UIView(frame:CGRect(x: 0,y: 0, width: width, height: 60))
    topBar.backgroundColor = UIColor.white
    topBar.layer.shadowColor = UIColor.gray.cgColor
    topBar.layer.shadowOffset = CGSize(width: 0, height: 3)
    topBar.layer.shadowOpacity = 1
    topBar.layer.masksToBounds = false
    topBar.layer.shadowRadius = 8.0;
    topBar.translatesAutoresizingMaskIntoConstraints = false

    //Label - Title
    let titleLabel = UILabel(frame:CGRect(x: width * 0.3, y: 13, width: width * 0.55, height: 40))
    titleLabel.text = "23 December 2018"
    titleLabel.contentMode = UIViewContentMode.center
    //include all in view
    topBar.addSubview(titleLabel)

    containerView.addSubview(topBar)

    let contentSize = diaryEntryText.sizeThatFits(diaryEntryText.bounds.size)
    diaryEntryText.text = "------Lorem ipsum dolor sit er elit lamet, consectetaur cillium adipisicing pecu, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum. Nam liber te conscient to factor tum poen legum odioque civiuda.Lorem ipsum dolor sit er elit lamet, consectetaur cillium adipisicing pecu, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum. Nam liber te conscient to factor tum poen legum odioque civiuda.Lorem ipsum dolor sit er elit lamet, consectetaur cillium adipisicing pecu, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur  magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum. Nam liber te conscient to factor tum poen legum odioque civiudaLorem ipsum dolor sit er elit lamet, consectetaur cillium adipisicing pecu, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. erunt mollit anim id est laborum. Nam liber te conscient to factor tum poen legum odioque civiudaLorem ipsum dolor sit er elit lamet, consectetaur cillium adipisicing pecu, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum. Nam liber te conscient to factor tum poen legum odioque civiuda.Lorem ipsum dolor sit er elit lamet, consectetaur cillium adipisicing pecu, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum. Nam liber te conscient to factor tum poen legum odioque civiuda.Lorem ipsum dolor sit er elit lamet, consectetaur cillium adipisicing pecu, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua., uda.-----------------"
    diaryEntryText.frame.size.width = self.view.frame.width - 40
    diaryEntryText.frame.size.height = contentSize.height
    diaryEntryText.frame = CGRect(x:20, y:80, width:self.view.frame.width - 2, height:contentSize.height)
    diaryEntryText.isScrollEnabled = true
    diaryEntryText.textAlignment = .justified

    containerView.addSubview(diaryEntryText)

    let fixedWidthText = self.view.frame.width - 40
    diaryEntryText.sizeThatFits(CGSize(width: fixedWidthText, height: CGFloat.greatestFiniteMagnitude))
    let newSizeText = diaryEntryText.sizeThatFits(CGSize(width: fixedWidthText, height: CGFloat.greatestFiniteMagnitude))
    var newFrameText = diaryEntryText.frame
    newFrameText.size = CGSize(width: max(newSizeText.width, fixedWidthText), height: newSizeText.height)
    diaryEntryText.frame = newFrameText

    self.tagListView = TagListView()
    tagListView.delegate = self
    let contentSizeTag = tagListView.frame.size.height
    let yTag = newSizeText.height + 10 + 80

    var tagFrame = self.tagListView.frame
    tagFrame.size.width = self.view.frame.width-2
    tagFrame.size.height = contentSizeTag
    tagFrame.origin.x = 20
    tagFrame.origin.y = yTag
    tagListView.frame = tagFrame
    let tagArrayList = ["happy","enjoy","try"]
    for element in tagArrayList {
        tagListView.addTag(element)
    }
    containerView.addSubview(tagListView)

    let fixedWidthTag = self.view.frame.width - 40
    tagListView.sizeThatFits(CGSize(width: fixedWidthTag, height: CGFloat.greatestFiniteMagnitude))
    let newSizeTag = diaryEntryText.sizeThatFits(CGSize(width: fixedWidthTag, height: CGFloat.greatestFiniteMagnitude))
    var newFrameTag = tagListView.frame
    newFrameTag.size = CGSize(width: max(newSizeTag.width, fixedWidthTag), height: newSizeTag.height)
    tagListView.frame = newFrameTag

    let contentSizeDate = diaryDate.frame.size.height
    let yDate = yTag + 20
    diaryDate.text = "HSR Layout, Bangalore"
    diaryDate.frame = CGRect(x: 20, y: yDate, width: self.view.frame.width - 2, height:contentSizeTag+20)
    diaryDate.textColor = UIColor.cyan

    containerView.addSubview(diaryDate)

     scrollView.addSubview(containerView)
    self.view.addSubview(scrollView)


    if #available(iOS 11.0, *) {

        let top = NSLayoutConstraint.init(item: containerView, attribute: .top, relatedBy: .equal, toItem: self.view.safeAreaLayoutGuide, attribute: .top, multiplier: 1.0, constant: 0.0)
        let leading = NSLayoutConstraint.init(item: containerView, attribute: .leading, relatedBy: .equal, toItem: self.view, attribute: .leading, multiplier: 1.0, constant: 0.0)
        let trailing = NSLayoutConstraint.init(item: containerView, attribute: .trailing, relatedBy: .equal, toItem: self.view, attribute: .trailing, multiplier: 1.0, constant: 0.0)
        let height = NSLayoutConstraint.init(item: containerView, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1.0, constant: 60.0)

        NSLayoutConstraint.activate([top, leading, trailing, height])

    } else {
        // Fallback on earlier versions
    }

    self.scrollView.contentSize = CGSize(width: self.view.frame.size.width, height: yDate + contentSizeDate)

}


override func viewDidLayoutSubviews() {

    super.viewDidLayoutSubviews()
    scrollView.frame = view.bounds
    containerView.frame = CGRect(x:0, y:0, width:scrollView.contentSize.width, height:scrollView.contentSize.height)

 /* I tried using this, but doesn't seem to work 

 let newSizeText = diaryEntryText.sizeThatFits(CGSize(width: self.view.frame.width - 40, height: CGFloat.greatestFiniteMagnitude))
    let yTag = newSizeText.height + 10 + 80
    let yDate = yTag + 20
    let contentSizeDate = diaryDate.frame.size.height

    self.scrollView.contentSize = CGSize(width: self.view.frame.size.width, height: yDate + contentSizeDate)
   */

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}
}

Answer 1

您缺少以下属性：

Swift 4.0

diaryDate.showsVerticalScrollIndicator = true
diaryDate.isScrollEnabled = true
diaryDate.scrollRangeToVisible(NSMakeRange(0, 0))
diaryDate.setContentOffset(CGPoint(x: 0, y: 0), animated: false)

您可能还需要将 UserInteractionEnabled 设置为 YES。

来源： https://stackoverflow.com/posts/46882570/revisions