[英]How to change UIButton attributed text colour programatically?
我有UIButton的子類(KeyButton),在其中為按鈕應用某些樣式。 以下代碼在ViewController中添加按鈕的屬性文本。
func superScriptText(text: String, button: KeyButton, fontSize: Int) {
let font:UIFont? = UIFont.systemFont(ofSize: 22, weight: UIFont.Weight.light)
let fontSuper:UIFont? = UIFont(name: "Helvetica", size:CGFloat(fontSize))
let attString:NSMutableAttributedString = NSMutableAttributedString(string: text, attributes: [.font:font!])
attString.setAttributes([.font:fontSuper!,.baselineOffset:15], range: NSRange(location:1,length:1))
button.setAttributedTitle(attString, for: .normal)
}
如何更改類中按鈕的屬性文本的顏色?
只是改變:
let attString:NSMutableAttributedString =
NSMutableAttributedString(string: text, attributes: [.font:font!])
至:
let attString:NSMutableAttributedString =
NSMutableAttributedString(string: text, attributes: [.font:font!, .foregroundColor: UIColor.red])
NSAttributedStringKey.foregroundColor
用於文本顏色,請參閱docs中的更多選項。
您必須將帶有UIColor
對象的.foregroundColor
鍵添加為NSAttributedString
的attributes
字典的值。
示例(假設您已在情節提要中添加了自定義按鈕):
class CustomButton: UIButton {
override func awakeFromNib() {
super.awakeFromNib()
let text = "CustomButton"
let font = UIFont.systemFont(ofSize: UIFont.buttonFontSize)
let textColor = UIColor.orange
let attributes: [NSAttributedStringKey: Any] = [
.font: font,
.foregroundColor: textColor
]
let attributedText = NSAttributedString(string: text, attributes: attributes)
self.setAttributedTitle(attributedText, for: .normal)
}
}
我無法通過UIButton
子類執行此操作。 我創建了NSAttributtedText
的子類,並添加了以下方法:
var textColor: UIColor?
func setSuperScript(text: String, button: KeyButton, fontSize: Int) {
let font:UIFont? = UIFont.systemFont(ofSize: 22, weight: UIFont.Weight.light)
let fontSuper:UIFont? = UIFont(name: "Helvetica", size:CGFloat(fontSize))
let attString:NSMutableAttributedString = NSMutableAttributedString(string: text, attributes: [.font:font!, .foregroundColor: textColor!])
attString.setAttributes([.font:fontSuper!,.baselineOffset:15, .foregroundColor: textColor!,], range: NSRange(location:1,length:1))
button.setAttributedTitle(attString, for: .normal)
}
我根據已有的邏輯設置顏色,然后相應地設置屬性字符串的顏色。
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