Cocoa UIPickerView不允许通过代理的“AttributedTitleFrrow”更改字体名称和大小`

我使用以下func更改字体颜色和字体大小，颜色可以工作，但字体名称和字体大小不能工作

func pickerView(pickerView: UIPickerView, attributedTitleForRow row: Int, forComponent component: Int) -> NSAttributedString? 

var myTitle = NSAttributedString(string: titleData, attributes: [NSFontAttributeName:UIFont(name: "Arial-BoldMT", size: 45)!, NSForegroundColorAttributeName:UIColor.whiteColor()])

有什么帮助吗

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Thx.

我还有一个选择，可能对你有帮助

完成正常选取器视图所需的所有工作：获取更多帮助

现在按照这个步骤：-您可以像这样使用viewForRow方法

func pickerView(pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusingView view: UIView!) -> UIView
{
    var pickerLabel = UILabel()
    pickerLabel.textColor = UIColor.blackColor()
    pickerLabel.text = "PickerView Cell Title"
   // pickerLabel.font = UIFont(name: pickerLabel.font.fontName, size: 15)
    pickerLabel.font = UIFont(name: "Arial-BoldMT", size: 15) // In this use your custom font
    pickerLabel.textAlignment = NSTextAlignment.Center
    return pickerLabel
}

更新的Swift 3

更新的Swift 5

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也许它对您完全有帮助，我在我的项目中也使用了它。

您可以为pickerview声明数据源

let arrDataSource:[String] = ["row 1","row 2","row 3"]

然后使用这个字符串数组作为下面函数中行的标题

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

{
    let pickerLabel = UILabel()
    pickerLabel.textColor = UIColor.blackColor()
    pickerLabel.text = arrDataSource[row]
     pickerLabel.font = UIFont(name: pickerLabel.font.fontName, size: 15)
    //pickerLabel.font = UIFont(name: "Arial-BoldMT", size: 15) // In this use your custom font
    pickerLabel.textAlignment = NSTextAlignment.Center
    return pickerLabel
 }

斯威夫特3

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

    var string = ""

    let pickerLabel = UILabel()
    pickerLabel.textColor = UIColor.white
    pickerLabel.text = string
    pickerLabel.font = UIFont(name: "Rubik-Regular", size: 22) // In this use your custom font
    pickerLabel.textAlignment = .center

    return pickerLabel

}

为了进一步详细说明UILabel的答案，我将使用一种更具内存优化功能的解决方案，它可以重用标签：

func pickerView(_ pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusing view: UIView?) -> UIView {
    let pickerLabel: UILabel
    if let label = view as? UILabel {
        pickerLabel = label
    } else {
        pickerLabel = UILabel()
        pickerLabel.font = UIFont(name: "Rubik-Regular", size: 22)
        pickerLabel.textAlignment = .center
    }
    pickerLabel.text = pickerData[row] //This is your string
    return pickerLabel
}

Swift 4.1/Xcode 9.4.1

显然，您可以选择自己的字体，但这里我使用的是System Bold 13

func pickerView(_ pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusing view: UIView?) -> UIView {
    let pickerLabel = UILabel()
    pickerLabel.font = UIFont.boldSystemFont(ofSize: 13)
    pickerLabel.textColor = UIColor.black
    pickerLabel.textAlignment = .center
    pickerLabel.text = "PickerView Cell Title"

    return pickerLabel
}

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是的，你的代码有效。但是我需要从PickerViewEwPickerView、titleForRow:row、forComponent:component获取重新计算的标题数据。顺便问一下，我如何在评论中发布代码呢？pickerView:titleForRow:forComponent:pickerView\UU2AttributedTitleFrow:forComponent:pickerView\U2ViewForRow:forComponent:reusingView：上面三个也可以显示pickerView内容，但不应该同时使用它们，我不知何故使用了其中的两个。现在只使用最后一个，问题就解决了。谢谢大家。这不仅仅是在Swift中…同样的问题在iOS 9 beta 5上仍然无法在iOS 11.4中使用Swift 4.1和Xcode 9.4.1。也许是时候提交一个bug了。iOS 12也不起作用。

func pickerView(_ pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusing view: UIView?) -> UIView {
    let pickerLabel: UILabel
    if let label = view as? UILabel {
        pickerLabel = label
    } else {
        pickerLabel = UILabel()
        pickerLabel.font = UIFont(name: "Rubik-Regular", size: 22)
        pickerLabel.textAlignment = .center
    }
    pickerLabel.text = pickerData[row] //This is your string
    return pickerLabel
}

func pickerView(_ pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusing view: UIView?) -> UIView {
    let pickerLabel = UILabel()
    pickerLabel.font = UIFont.boldSystemFont(ofSize: 13)
    pickerLabel.textColor = UIColor.black
    pickerLabel.textAlignment = .center
    pickerLabel.text = "PickerView Cell Title"

    return pickerLabel
}