在swift中使用属性字符串使文本加粗 [英] Making text bold using attributed string in swift

问题描述

我有一个这样的字符串

var str = "@text1 this is good @text1"

现在用另一个字符串替换text1，比如t 1.我可以替换文本，但无法将其加粗.我想将新字符串 t 1 加粗，以便最终输出:

Now replace text1 with another string, say t 1. I am able to replace the text, but i am not able to bold it. I want to bold the new string t 1, so that the final output will be:

@t 1这很好@t 1

我该怎么做?

我看到的所有例子都是用 Objective-C 写的，但我想用 Swift 来做.

All the examples I am seeing are in Objective-C, but I want to do it in Swift.

提前致谢.

推荐答案

用法:

let label = UILabel()
label.attributedText =
    NSMutableAttributedString()
        .bold("Address: ")
        .normal(" Kathmandu, Nepal

")
        .orangeHighlight(" Email: ")
        .blackHighlight(" [e-mail] ")
        .bold("

Copyright: ")
        .underlined(" All rights reserved. 2020.")

结果:

这是在单个标签中组合粗体和普通文本以及一些其他奖励方法的巧妙方法.

Here is a neat way to make a combination of bold and normal texts in a single label plus some other bonus methods.

扩展:Swift 5.*

extension NSMutableAttributedString {
    var fontSize:CGFloat { return 14 }
    var boldFont:UIFont { return UIFont(name: "AvenirNext-Bold", size: fontSize) ?? UIFont.boldSystemFont(ofSize: fontSize) }
    var normalFont:UIFont { return UIFont(name: "AvenirNext-Regular", size: fontSize) ?? UIFont.systemFont(ofSize: fontSize)}
    
    func bold(_ value:String) -> NSMutableAttributedString {
        
        let attributes:[NSAttributedString.Key : Any] = [
            .font : boldFont
        ]
        
        self.append(NSAttributedString(string: value, attributes:attributes))
        return self
    }
    
    func normal(_ value:String) -> NSMutableAttributedString {
        
        let attributes:[NSAttributedString.Key : Any] = [
            .font : normalFont,
        ]
        
        self.append(NSAttributedString(string: value, attributes:attributes))
        return self
    }
    /* Other styling methods */
    func orangeHighlight(_ value:String) -> NSMutableAttributedString {
        
        let attributes:[NSAttributedString.Key : Any] = [
            .font :  normalFont,
            .foregroundColor : UIColor.white,
            .backgroundColor : UIColor.orange
        ]
        
        self.append(NSAttributedString(string: value, attributes:attributes))
        return self
    }
    
    func blackHighlight(_ value:String) -> NSMutableAttributedString {
        
        let attributes:[NSAttributedString.Key : Any] = [
            .font :  normalFont,
            .foregroundColor : UIColor.white,
            .backgroundColor : UIColor.black
            
        ]
        
        self.append(NSAttributedString(string: value, attributes:attributes))
        return self
    }
    
    func underlined(_ value:String) -> NSMutableAttributedString {
        
        let attributes:[NSAttributedString.Key : Any] = [
            .font :  normalFont,
            .underlineStyle : NSUnderlineStyle.single.rawValue
            
        ]
        
        self.append(NSAttributedString(string: value, attributes:attributes))
        return self
    }
}

注意:如果编译器缺少 UIFont/UIColor，请将它们替换为 NSFont/NSColor.

Note: If compiler is missing UIFont/UIColor, replace them with NSFont/NSColor.

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