用另一个NSAttributedString替换NSAttributedString的子字符串

我想用另一个

NSAttributedString

替换

NSAttributedString

的子字符串（例如

@“替换”

）

我正在为

NSAttributedString

寻找与

NSString

等效的方法

将属性化字符串转换为

NSMutableAttributedString

的实例

可变属性字符串具有

mutableString

属性。根据文件：

“接收方跟踪对此字符串的更改，并使其属性映射保持最新。”

因此，您可以使用生成的可变字符串执行替换，替换为

replaceConcurrencesofString:with字符串：选项：范围：

---

以下是如何更改NSMutableAttributedString的字符串，同时保留其属性：

Swift:

// first we create a mutable copy of attributed text 
let originalAttributedText = nameLabel.attributedText?.mutableCopy() as! NSMutableAttributedString

// then we replace text so easily
let newAttributedText = originalAttributedText.mutableString.setString("new text to replace")

NSMutableAttributedString *newAttrStr = [attribtedTxt.mutableString setString:@"new string"];

目标-C:

// first we create a mutable copy of attributed text 
let originalAttributedText = nameLabel.attributedText?.mutableCopy() as! NSMutableAttributedString

// then we replace text so easily
let newAttributedText = originalAttributedText.mutableString.setString("new text to replace")

NSMutableAttributedString *newAttrStr = [attribtedTxt.mutableString setString:@"new string"];

---

我必须在

标记中使用粗体文本，以下是我所做的：

- (NSAttributedString *)boldString:(NSString *)string {
    UIFont *boldFont = [UIFont boldSystemFontOfSize:14];
    NSMutableAttributedString *attributedDescription = [[NSMutableAttributedString alloc] initWithString:string];

    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@".*?<b>(.*?)<\\/b>.*?" options:NSRegularExpressionCaseInsensitive error:NULL];
    NSArray *myArray = [regex matchesInString:string options:0 range:NSMakeRange(0, string.length)] ;
    for (NSTextCheckingResult *match in myArray) {
        NSRange matchRange = [match rangeAtIndex:1];
        [attributedDescription addAttribute:NSFontAttributeName value:boldFont range:matchRange];
    }
    while ([attributedDescription.string containsString:@"<b>"] || [attributedDescription.string containsString:@"</b>"]) {
        NSRange rangeOfTag = [attributedDescription.string rangeOfString:@"<b>"];
        [attributedDescription replaceCharactersInRange:rangeOfTag withString:@""];
        rangeOfTag = [attributedDescription.string rangeOfString:@"</b>"];
        [attributedDescription replaceCharactersInRange:rangeOfTag withString:@""];
    }
    return attributedDescription;
}

-（NSAttributedString*）boldString:（NSString*）字符串{
UIFont*boldFont=[UIFont boldSystemFontOfSize:14]；
NSMutableAttributedString*attributedDescription=[[NSMutableAttributedString alloc]initWithString:string]；
NSRegularExpression*regex=[NSRegularExpression regularExpressionWithPattern:@.*？（.*？.*？。？*？？？。？”选项：NSRegularExpression不区分大小写错误：NULL]；
NSArray*myArray=[regex-matchesisnstring:string-options:0-range:NSMakeRange（0，string.length）]；
for（NSTextCheckingResult*匹配myArray）{
NSRange matchRange=[匹配范围索引：1]；
[attributedDescription addAttribute:NSFontAttributeName值：粗体字体范围：匹配范围]；
}
而（[attributedDescription.string包含字符串：@”“]| |[attributedDescription.string包含字符串：@”“）{
NSRange rangeOfTag=[attributedDescription.string rangeOfString:@”“；
[attributedDescription ReplaceCharactersRange:带字符串的标记范围：@”“；
rangeOfTag=[attributedDescription.string rangeOfString:@”“；
[attributedDescription ReplaceCharactersRange:带字符串的标记范围：@”“；
}
返回属性描述；
}

在我的例子中，以下方法是唯一的（在iOS9上测试）：

---

当然，找到另一个更好的方法会很好。

我发现所有其他答案都不起作用。下面是我如何替换类别扩展中NSAttributed字符串的内容：

func stringWithString(stringToReplace:String, replacedWithString newStringPart:String) -> NSMutableAttributedString
{
    let mutableAttributedString = mutableCopy() as! NSMutableAttributedString
    let mutableString = mutableAttributedString.mutableString

    while mutableString.containsString(stringToReplace) {
        let rangeOfStringToBeReplaced = mutableString.rangeOfString(stringToReplace)
        mutableAttributedString.replaceCharactersInRange(rangeOfStringToBeReplaced, withString: newStringPart)
    }
    return mutableAttributedString
}

---

使用Swift 4和iOS 11，您可以使用以下两种方法之一来解决问题

---

#1.使用

nsmutableAttributeString

replaceCharacters（in:with:）

方法

nsmutableAttributeString

有一个名为的方法

replaceCharacters（in:with:）

具有以下声明：

将给定范围内的字符和属性替换为给定属性字符串的字符和属性

下面的代码显示了如何使用

replaceCharacters（in:with:）

将

NSMutableAttributedString

实例的子字符串替换为新的

NSMutableAttributedString

实例：

import UIKit

// Set initial attributed string
let initialString = "This is the initial string"
let attributes = [NSAttributedStringKey.foregroundColor : UIColor.red]
let mutableAttributedString = NSMutableAttributedString(string: initialString, attributes: attributes)

// Set new attributed string
let newString = "new"
let newAttributes = [NSAttributedStringKey.underlineStyle : NSUnderlineStyle.styleSingle.rawValue]
let newAttributedString = NSMutableAttributedString(string: newString, attributes: newAttributes)

// Get range of text to replace
guard let range = mutableAttributedString.string.range(of: "initial") else { exit(0) }
let nsRange = NSRange(range, in: mutableAttributedString.string)

// Replace content in range with the new content
mutableAttributedString.replaceCharacters(in: nsRange, with: newAttributedString)

import UIKit

// Set initial attributed string
let initialString = "This is the initial string"
let attributes = [NSAttributedStringKey.foregroundColor : UIColor.red]
let mutableAttributedString = NSMutableAttributedString(string: initialString, attributes: attributes)

// Set new string
let newString = "new"

// Replace replaceable content in mutableAttributedString with new content
let totalRange = NSRange(location: 0, length: mutableAttributedString.string.count)
_ = mutableAttributedString.mutableString.replaceOccurrences(of: "initial", with: newString, options: [], range: totalRange)

// Get range of text that requires new attributes
guard let range = mutableAttributedString.string.range(of: newString) else { exit(0) }
let nsRange = NSRange(range, in: mutableAttributedString.string)

// Apply new attributes to the text matching the range
let newAttributes = [NSAttributedStringKey.underlineStyle : NSUnderlineStyle.styleSingle.rawValue]
mutableAttributedString.setAttributes(newAttributes, range: nsRange)

---

#2.使用

NSMutableString

replaceAccurrencess（of:with:options:range:）

方法

NSMutableString

有一个名为的方法

replaceAccurrencess（of:with:options:range:）

具有以下声明：

将给定范围内给定字符串的所有匹配项替换为另一个给定字符串，并返回替换次数

下面的代码显示了如何使用

replaceAccurrencess（of:with:options:range:）

将

NSMutableAttributedString

实例的子字符串替换为新的

NSMutableAttributedString

实例：

import UIKit

// Set initial attributed string
let initialString = "This is the initial string"
let attributes = [NSAttributedStringKey.foregroundColor : UIColor.red]
let mutableAttributedString = NSMutableAttributedString(string: initialString, attributes: attributes)

// Set new attributed string
let newString = "new"
let newAttributes = [NSAttributedStringKey.underlineStyle : NSUnderlineStyle.styleSingle.rawValue]
let newAttributedString = NSMutableAttributedString(string: newString, attributes: newAttributes)

// Get range of text to replace
guard let range = mutableAttributedString.string.range(of: "initial") else { exit(0) }
let nsRange = NSRange(range, in: mutableAttributedString.string)

// Replace content in range with the new content
mutableAttributedString.replaceCharacters(in: nsRange, with: newAttributedString)

import UIKit

// Set initial attributed string
let initialString = "This is the initial string"
let attributes = [NSAttributedStringKey.foregroundColor : UIColor.red]
let mutableAttributedString = NSMutableAttributedString(string: initialString, attributes: attributes)

// Set new string
let newString = "new"

// Replace replaceable content in mutableAttributedString with new content
let totalRange = NSRange(location: 0, length: mutableAttributedString.string.count)
_ = mutableAttributedString.mutableString.replaceOccurrences(of: "initial", with: newString, options: [], range: totalRange)

// Get range of text that requires new attributes
guard let range = mutableAttributedString.string.range(of: newString) else { exit(0) }
let nsRange = NSRange(range, in: mutableAttributedString.string)

// Apply new attributes to the text matching the range
let newAttributes = [NSAttributedStringKey.underlineStyle : NSUnderlineStyle.styleSingle.rawValue]
mutableAttributedString.setAttributes(newAttributes, range: nsRange)

---

我有一个具体的要求和固定如下。这可能对某人有所帮助

要求：在故事板中，富文本直接添加到UITextView的属性中，该属性包含一个单词“应用程序版本：1.0”。现在，我必须通过从info plist读取版本号来动态显示版本号

解决方案： 从情节提要中删除了版本号1.0，只是保留了“应用程序版本：”并添加了以下代码

NSAttributedString *attribute = self.firsttextView.attributedText;
NSMutableAttributedString *mutableAttri = [[NSMutableAttributedString alloc] initWithAttributedString:attribute];
NSString *appVersionText = @"App Version:";
if ([[mutableAttri mutableString] containsString:appVersionText]) {
    NSDictionary* infoDict = [[NSBundle mainBundle] infoDictionary];
    NSString* version = [infoDict objectForKey:@"CFBundleShortVersionString"];
    NSString *newappversion = [NSString stringWithFormat:@"%@ %@",appVersionText,version] ;
    [[mutableAttri mutableString] replaceOccurrencesOfString:appVersionText withString:newappversion options:NSCaseInsensitiveSearch range:NSMakeRange(0, mutableAttri.length)];
    self.firsttextView.attributedText = mutableAttri;
}

完成！！更新/修改属性文本。

Swift 4:

---

更新了Swift 4的优秀解决方案，并以“扩展”包装。只需将其剪辑到ViewController（类外）并使用它

extension NSAttributedString {
    func stringWithString(stringToReplace: String, replacedWithString newStringPart: String) -> NSMutableAttributedString
    {
        let mutableAttributedString = mutableCopy() as! NSMutableAttributedString
        let mutableString = mutableAttributedString.mutableString
        while mutableString.contains(stringToReplace) {
            let rangeOfStringToBeReplaced = mutableString.range(of: stringToReplace)
            mutableAttributedString.replaceCharacters(in: rangeOfStringToBeReplaced, with: newStringPart)
        }
        return mutableAttributedString
    }
}

---

这不是私有API吗？因为可变字符串属性是只读的？@MichalShatz否。只读属性意味着您不能为其分配其他对象（即，您不能调用

setMutableString:

）。但在适当的位置修改可变字符串对象是完全正确的。这就是这个属性存在的全部原因。这真的是一个答案吗？第二个参数（withString）是AttributedStrings，我遇到了一个强制转换问题方法“ReplaceCurrencesOfString:withString:options:range:”应用于NSMutableString，而不是NSAttributedString或NSMutableAttributedString。如果转换为NSMutableString并在此处进行替换，则转换后将丢失其属性。问题是如何获得NSAttributedString作为结果，而不仅仅是字符串，因此答案完全不相关，但它得到了如此多的支持票。这很好，例如替换新行字符：

[[result mutableString]replaceCurrencesofString:@“\n”with string:@”“选项：NSCaseInsensitiveSearch范围：NSMakeRange（0，result.length）];您的示例甚至可能无法编译。存储在NSMutableAttributeString中的C字符串？替换无效，因为您在未引用的情况下对副本（
mutableString
）进行了替换？这更适合替换给定范围内的字符串，而不是引用，因为字符串可能包含重复的子字符串。用于替换给定范围内的文本(