ios - UIScrollView 需要根据 UILabel 大小进行扩展，但保持底部标签栏

Question

所以我的 ViewController 底部有一个自制的菜单栏，我需要将其限制在屏幕底部。在导航栏和底部栏之间，我想要一个 ScrollView ，因此我插入了一个 UIScrollView，并在该 ScrollView 中放置了一个 UIView。我这样做是因为我遇到了一个错误，该错误已通过此线程解决:

UIScrollView Scrollable Content Size Ambiguity

所以我有一些标签，可以根据标签使用的文本调整大小。我希望 UIScrollView 以及关联的 UIView 根据 UILabels 的长度进行调整。现在我的标签位于底部栏下方，但 View 没有滚动。这是我的代码:

//
//  ItemViewController.swift
//

import UIKit
import Parse

class ItemViewController: UIViewController {


    @IBOutlet weak var menuButton: UIButton!

    @IBOutlet weak var mainImage: UIImageView!

    @IBOutlet weak var innerView: UIView!

    @IBOutlet weak var scrollView: UIScrollView!


    @IBOutlet weak var heading1: UILabel!

    @IBOutlet weak var body1: UILabel!

    @IBOutlet weak var heading2: UILabel!

    @IBOutlet weak var body2: UILabel!




    override func viewDidLoad() {
            super.viewDidLoad()


            for var y = 0; y < detailsHeadings.count; y++ {

                    switch y {
                    case 0:
                            heading1.text = detailsHeadings[y]
                            body1.text = details[heading1.text!]
                            let numLines = calcLines(body1.text!)
                            body1.numberOfLines = numLines!
                            break;
                    case 1:
                            heading2.text = detailsHeadings[y]
                            body2.text = details[heading2.text!]
                            let numLines = calcLines(body2.text!)
                            body2.numberOfLines = numLines!
                            break;
                    default:

                            break;
                    }

            }

            //none of the below worked
            scrollView.sizeToFit()
            scrollView.sizeThatFits(CGSize(width: 310, height: 700))
            innerView.sizeThatFits(CGSize(width: 310, height: 700))

            innerView.frame = CGRect(x: 0, y: 0, width: 320, height: 700)


    }

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



    func calcLines(textString: String) -> Int?  {

            let text = textString
            // cast text to NSString so we can use sizeWithAttributes
            var myText = text as NSString

            //Set attributes
            var attributes = [NSFontAttributeName : UIFont.systemFontOfSize(12)]

            //Calculate the size of your UILabel by using the systemfont and the paragraph we created before. Edit the font and replace it with yours if you use another
            var labelSize = myText.boundingRectWithSize(CGSizeMake(body1.bounds.width, CGFloat.max), options: NSStringDrawingOptions.UsesLineFragmentOrigin, attributes: attributes, context: nil)

            //Now we return the amount of lines using the ceil method
            var lines = ceil(CGFloat(labelSize.height) / body1.font.lineHeight)
            println(lines)

            let linesInt: Int = Int(lines)

            return linesInt

    }

}

有人知道如何实现这一目标吗？任何帮助将不胜感激。

Answer 1

尝试以下步骤:

• 设置标签的所有前导、尾随、顶部和底部约束 到其 superview 以及 superview 到 scrollView
• 将标签的行数设置为0(无限制)

<小时/>

假设您正在使用自动布局，因为您指的是 UIScrollView content size ambiguity