Question

我的要求是，当文本字段的占位符可见时，其颜色应为灰色且字体大小为10，但是当用户开始在文本字段中键入内容时，其颜色应为黑色且字体大小为14。我已经尝试过： / p>

textField.attributedPlaceholder = NSAttributedString(string: placeholderText,
                                                    attributes: [NSAttributedString.Key.foregroundColor: Color.iPhoneGrayColor, NSAttributedString.Key.font: UIFont(name: "SourceSansPro-Regular", size: 10)!])
    textField.textColor = UIColor.black
    textField.font = UIFont(name: "SourceSansPro-Regular", size: 14)!

但是，我的占位符字体大小被textfield.font覆盖，所以我无法获得大小为10的占位符。现在尝试了几个小时。任何帮助将不胜感激。

Answer 1

只需尝试以下代码，请执行UITextFieldEditingChanged操作插座，然后按以下方式使用。

@IBAction func nameTextFieldEditingChanged(_ sender: UITextField) {
        if sender.text?.isEmpty ?? true {
            //placeholder text size set here
            textField.font = UIFont(name: "SourceSansPro-Regular", size: 10)!
        } else {
            // When user starting typing
            textField.textColor = UIColor.black
            textField.font = UIFont(name: "SourceSansPro-Regular", size: 14)!
        }
    }

如有疑问，请发表评论。

Answer 2

在设置字体后简单地设置占位符，因为设置字体也适用于占位符（请参见https://developer.apple.com/documentation/uikit/uitextfield/1619604-font）：

textField.font = ...
textField.textColor = ...

textField.attributedPlaceholder = ...

Answer 3

只需尝试以下代码即可进一步帮助您

    var myMutableStringTitle = NSMutableAttributedString()
    let Name  = "Enter Title" // PlaceHolderText

    myMutableStringTitle = NSMutableAttributedString(string:Name, attributes: [NSFontAttributeName:UIFont(name: "Georgia", size: 20.0)!]) // Font
    myMutableStringTitle.addAttribute(NSForegroundColorAttributeName, value: UIColor.redColor(), range:NSRange(location:0,length:Name.characters.count))    // Color
    txtTitle.attributedPlaceholder = myMutableStringTitle

Answer 4

在您的 viewDidLoad() 方法中尝试以下代码：

textField.attributedPlaceholder = NSAttributedString(string: placeholderText, attributes: [NSAttributedString.Key.foregroundColor: Color.iPhoneGrayColor, NSAttributedString.Key.font: UIFont(name: "SourceSansPro-Regular", size: 10)!])
    textField.textColor = UIColor.black
    textField.font = UIFont(name: "SourceSansPro-Regular", size: 14)!

UITextField占位符和文本大小应分开-Swift

4 个答案: