UISegmentedControl文本有多行

Question

是否有可能在iOs 9+中使用多行文本制作UISegmentedControl？

到目前为止我已经尝试过：

1. 来自SO主题的变体：This, this and this one
2. 进行扩展：

   extension UISegmentedControl
   {
       func makeMultiline(numberOfLines: Int)
       {
           for segment in self.subviews
           {
               let labels = segment.subviews.filter { $0 is UILabel }  // [AnyObject]
               labels.map { ($0 as UILabel).numberOfLines = numberOfLines }    
           }
       }
   }

3. 继承自UISegmentedControl并在Identity Inspector中将新类设置为SegmentedControl

   class MultilineSegmentedControl: UISegmentedControl
   {
       override func didMoveToSuperview()
       {
           for segment in subviews
           {
               for subview in segment.subviews
               {
                   if let segmentLabel = subview as? UILabel
                   {
                       segmentLabel.numberOfLines = 2
                   }
               }
           }
       }
   }

4. 使用文本而不是标题设置图像并更改UISegmentedControl的框架 viewDidLayoutSubviews() 方法。它使UISegmentedControl高度更大，但是图像保持高度，就好像UISegmentedControl没有放大，并且在第一次交互时UISegmentedControl缩小到它的默认高度。

Answer 1

也许它有点晚了但是这是我的子类来解决swift 3中的这个问题：

@IBDesignable class MySegmentedControl: UISegmentedControl {

    @IBInspectable var height: CGFloat = 29 {
        didSet {
            let centerSave = center
            frame = CGRect(x: frame.minX, y: frame.minY, width: frame.width, height: height)
            center = centerSave
        }
    }

    @IBInspectable var multilinesMode: Bool = false

    override func layoutSubviews() {
        super.layoutSubviews()
        for segment in self.subviews {
            for subview in segment.subviews {
                if let segmentLabel = subview as? UILabel {
                    segmentLabel.frame = CGRect(x: 0, y: 0, width: segmentLabel.frame.size.width, height: segmentLabel.frame.size.height * 1.6)
                    if (multilinesMode == true)
                    {
                        segmentLabel.numberOfLines = 0
                    }
                    else
                    {
                        segmentLabel.numberOfLines = 1
                    }
                }
            }
        }
    }

}

Answer 2

尝试下面的代码，找出所有segmentedControl sub UILabel并设置numberOfLines。

for segmentViews in segmentedControl.subviews {
    for segmentLabel in segmentViews.subviews {
        if segmentLabel is UILabel {
            (segmentLabel as! UILabel).numberOfLines = 0
        }
    }
}