[英]Cocoa NSTextField change placeholder color
我嘗試更改占位符文本顏色。 此代碼不起作用:
let color = NSColor.redColor()
let attrs = [NSForegroundColorAttributeName: color]
let placeHolderStr = NSAttributedString(string: "My placeholder", attributes: attrs)
myTextField.placeholderAttributedString = placeHolderStr
我收到錯誤-[NSTextField setPlaceholderAttributedString:]: unrecognized selector sent to instance
。 任何想法,我怎么能改變占位符的顏色?
更新:這有效:
(myTextField.cell() as NSTextFieldCell).placeholderAttributedString = placeHolderStr
更新2:嗯,它改變顏色,但如果文本字段獲得焦點,占位符字體大小變得更小,非常奇怪。
通過顯式定義NSAttributedString的字體,原始問題中引用的占位符字體大小調整是固定的。
以下是Swift 3.0中的一個工作示例。
let color = NSColor.red
let font = NSFont.systemFont(ofSize: 14)
let attrs = [NSForegroundColorAttributeName: color, NSFontAttributeName: font]
let placeholderString = NSAttributedString(string: "My placeholder", attributes: attrs)
(textField.cell as? NSTextFieldCell)?.placeholderAttributedString = placeholderString
以下是Swift 4.2中的一個工作示例。
let attrs = [NSAttributedString.Key.foregroundColor: NSColor.lightGray,
NSAttributedString.Key.font: NSFont.systemFont(ofSize: 14)]
let placeholderString = NSAttributedString(string: "My placeholder", attributes: attrs)
(taskTextField.cell as? NSTextFieldCell)?.placeholderAttributedString = placeholderString
您應該在NSTextFieldCell
而不是NSTextField
設置占位符文本。
myTextField.cell.placeholderAttributedString = placeHolderStr
你應該保留IB的當前字體和當前值
extension NSTextField {
func setHintTextColor (color: NSColor) {
let currentHint = placeholderString ?? ""
let placeholderAttributes: [NSAttributedString.Key: Any] = [
NSAttributedString.Key.foregroundColor: color,
NSAttributedString.Key.font: font!
]
let placeholderAttributedString = NSMutableAttributedString(string: currentHint, attributes: placeholderAttributes)
let paragraphStyle = NSMutableParagraphStyle()
placeholderAttributedString.addAttribute(NSAttributedString.Key.paragraphStyle, value: paragraphStyle, range: NSRange(location: 0,length: placeholderAttributedString.length))
self.placeholderAttributedString = placeholderAttributedString
}
}
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