用途:
在UILable展示时,在任意地方添加一个标记(比如:*),作为特殊标题的记号(如:必填项等)
代码
extension UILabel {
// 放置符号
enum EmphasisText: String {
case star = "*"
}
// 放置位置
enum EmphasisPosition {
case start
case index(Int)
case end
}
func setupAttr(_ emphasis: EmphasisText, color: UIColor? = UIColor.red, position: EmphasisPosition? = .start) {
if let str = self.text, str.count > 0 {
var string = ""
switch position! {
case .start:
string = emphasis.rawValue + str
case .index(let i):
string = str
string.insert(contentsOf: emphasis.rawValue, at: str.index(str.startIndex, offsetBy: i))
case .end:
string = str + emphasis.rawValue
}
let ranStr = emphasis.rawValue
let attrStr: NSMutableAttributedString = NSMutableAttributedString(string:string)
let strN = NSString(string: string)
let range = strN.range(of: ranStr)
attrStr.addAttribute(NSAttributedString.Key.foregroundColor, value: color!, range: range)
self.text = ""
self.attributedText = attrStr
}
}
}
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