Swift 使自定义标识符之间的 UILabel 文本加粗

Question

我有一个文本为

的 UILabel

This is not bold, -bold- this is bold, -/bold- and this is another not bold, -bold- this is another bold -/bold-.

现在，我想将文本中每个 -bold- 和 -/bold- 之间的文本字体更改为粗体，这样它就会变成这样

This is not bold, this is bold, and this is another not bold, this is another bold.

我该怎么做？

Answer 1

您可以使用 NSMutableAttributedString 并将其设置为 UILabel 的 attributedText 属性.

let label = UILabel()
//Choose your bold font
let boldAttributes = [NSFontAttributeName : UIFont.boldSystemFont(ofSize: 15)]
let mutableAttributedString = NSMutableAttributedString()
mutableAttributedString.append(NSAttributedString(string: "Non-bold text #1", attributes: nil))
mutableAttributedString.append(NSAttributedString(string: "Bold text #1", attributes: boldAttributes))
mutableAttributedString.append(NSAttributedString(string: "Non-bold text #2", attributes: nil))
mutableAttributedString.append(NSAttributedString(string: "Bold text #2", attributes: boldAttributes))
label.attributedText = mutableAttributedString

Answer 2

首先，获取分隔符内的字符串。

let query = "This is not bold, -bold- this is bold, -/bold- and this is another not bold, -bold- this is another bold -/bold-"
let regex = try! NSRegularExpression(pattern: "-bold- (.*?) -/bold-", options: [])
var results = [String]()
regex.enumerateMatches(in: query, options: [], range: NSMakeRange(0, query.utf16.count)) { result, flags, stop in

    if let r = result?.range(at: 1),
        let range = Range(r, in: query) {
        results.append(String(query[range]))
    }
}

print(results)

接下来，创建如下所示的字符串扩展方法。

extension String {

    func attributedString(with style: [NSAttributedString.Key: Any]? = nil,
                          and highlightedTextArray: [String],
                          with highlightedTextStyleArray: [[NSAttributedString.Key: Any]?]) -> NSAttributedString {

        let formattedString = NSMutableAttributedString(string: self, attributes: style)
        if highlightedTextArray.count != highlightedTextStyleArray.count {
            return formattedString
        }

        for (highlightedText, highlightedTextStyle) in zip(highlightedTextArray, highlightedTextStyleArray) {
            let highlightedTextRange: NSRange = (self as NSString).range(of: highlightedText as String)
            formattedString.setAttributes(highlightedTextStyle, range: highlightedTextRange)
        }

        return formattedString
    }
}

方法详情：

第一个参数：需要申请的字体样式等属性完整的字符串。
第二个参数：要应用新样式的字符串数组。
第三个参数：要应用的新样式（在本例中为粗体）。
returns 结果属性字符串。

最后调用如下方法

let attributedText = query.attributedString(with: [.font: UIFont.systemFont(ofSize: 12.0, weight: .regular)],
                       and: results,
                       with: [[.font: UIFont.systemFont(ofSize: 12.0, weight: .bold)]])

希望对您有所帮助。

Answer 3

实施：

为 NSMutableAttributedString 编写扩展并实现粗体和普通字符串属性的方法。

 extension NSMutableAttributedString {


    func bold(_ value:String) -> NSMutableAttributedString {

        let attributes:[NSAttributedString.Key : Any] = [.font : UIFont.boldSystemFont(ofSize: 15)]

        self.append(NSAttributedString(string: value, attributes:attributes))
        return self
    }

    func normal(_ value:String) -> NSMutableAttributedString {

        let attributes:[NSAttributedString.Key : Any] = [.font : UIFont.systemFont(ofSize: 15)]

        self.append(NSAttributedString(string: value, attributes:attributes))
        return self
    }
}

用法：

textLabel.attributedText = NSMutableAttributedString().normal("This is not bold, ").bold("this is bold, ").normal("and this is another not bold, ").bold("this is another bold.")

结果：

Swift 使自定义标识符之间的 UILabel 文本加粗

Swift make UILabel text bold in between custom identifier

swift

string

fonts

uilabel

bold