Question

我正在尝试实现viewForRow委托，因此每行可以有两个标签。我目前只使用每行一个标签。任何帮助都非常感谢。

func pickerView(pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusingView view: UIView?) -> UIView {
    var returnLabel = view as UIView!

    if view == nil {
        returnLabel = UIView()
    }

    var pickerLabel = view as! UILabel!
    if view == nil {
        pickerLabel = UILabel()
    }

    let titleData = List

    let myTitle = NSAttributedString(string: titleData[row], attributes: [NSFontAttributeName:UIFont(name: "Helvetica Neue", size: 17.0)!,NSForegroundColorAttributeName:UIColor.whiteColor()])
    pickerLabel.attributedText = myTitle
    pickerLabel.textAlignment = .Center

     var pickerLabel2 = view as! UILabel!
     if view == nil {
         pickerLabel2 = UILabel()
     }

     let subtitleData = subtitleList

     let mySubtitleTitle = NSAttributedString(string: subtitleData[row], attributes: [NSFontAttributeName:UIFont(name: "Helvetica Neue", size: 12.0)!,NSForegroundColorAttributeName:UIColor.whiteColor()])
     pickerLabel2.attributedText = mySubtitleTitle
     pickerLabel2.textAlignment = .Left

    returnLabel.addSubview(pickerLabel)
    returnLabel.addSubview(pickerLabel2)

    return returnLabel
}

func pickerView(pickerView: UIPickerView, rowHeightForComponent component: Int) -> CGFloat {
    return 60
}

Answer 1

您没有为标签指定框架。请参阅完整代码段：

class ViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {

    let rowHeight:CGFloat = 60.0
    let List = ["data1_1", "data1_2", "data1_3"]
    let subtitleList = ["data2_1", "data2_2", "data2_3"]

    override func viewDidLoad() {
        super.viewDidLoad()

    }

    func pickerView(pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusingView view: UIView?) -> UIView {

        var returnLabel: UIView!
        var pickerLabel: UILabel!
        var pickerLabel2: UILabel!

        if view == nil {
            returnLabel = UIView(frame: CGRectMake(0, 0, pickerView.frame.size.width, rowHeight))
            pickerLabel = UILabel(frame: CGRectMake(0, 0, returnLabel.frame.size.width, rowHeight / 2))
            pickerLabel2 = UILabel(frame: CGRectMake(0, rowHeight / 2, returnLabel.frame.size.width, rowHeight / 2))
            returnLabel.addSubview(pickerLabel)
            returnLabel.addSubview(pickerLabel2)
        }

        // title

        let titleData = List

        let myTitle = NSAttributedString(string: titleData[row], attributes: [NSFontAttributeName:UIFont(name: "Helvetica Neue", size: 17.0)!,NSForegroundColorAttributeName:UIColor.whiteColor()])
        pickerLabel.attributedText = myTitle
        pickerLabel.textAlignment = .Center

        // subtitle

        let subtitleData = subtitleList

        let mySubtitleTitle = NSAttributedString(string: subtitleData[row], attributes: [NSFontAttributeName:UIFont(name: "Helvetica Neue", size: 12.0)!,NSForegroundColorAttributeName:UIColor.whiteColor()])
        pickerLabel2.attributedText = mySubtitleTitle

        return returnLabel
    }

    func pickerView(pickerView: UIPickerView, rowHeightForComponent component: Int) -> CGFloat {
        return rowHeight
    }

    func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
        return 1
    }

    func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return List.count
    }

}

每行有两个标签，带有pickerView

1 个答案: