我想将@"replace"的子字符串（例如NSAttributedString）替换为另一个NSAttributedString。
我正在为NSString寻找NSAttributedString stringByReplacingOccurrencesOfString:withString:的等效方法。
答案 0 :(得分：76)
将您的属性字符串转换为NSMutableAttributedString。
可变属性字符串具有mutableString属性。根据文件：
“接收者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来执行replaceOccurrencesOfString:withString:options:range:的替换。
答案 1 :(得分：19)
以下是如何更改NSMutableAttributedString的字符串，同时保留其属性：
<强>夫特：
// 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")
<强>目标-C：
NSMutableAttributedString *newAttrStr = [attribtedTxt.mutableString setString:@"new string"];
答案 2 :(得分：18)
在我的情况下，以下方式是唯一的（在iOS9上测试）：
NSAttributedString *attributedString = ...;
NSAttributedString *anotherAttributedString = ...; //the string which will replace
while ([attributedString.mutableString containsString:@"replace"]) {
NSRange range = [attributedString.mutableString rangeOfString:@"replace"];
[attributedString replaceCharactersInRange:range withAttributedString:anotherAttributedString];
}
当然，找到另一种更好的方法会很好。
答案 3 :(得分：9)
使用Swift 4和iOS 11，您可以使用以下两种方式之一来解决您的问题。
NSMutableAttributedString replaceCharacters(in:with:)方法 NSMutableAttributedString有一个名为replaceCharacters(in:with:)的方法。 replaceCharacters(in:with:)有以下声明：
使用给定属性字符串的字符和属性替换给定范围内的字符和属性。
func replaceCharacters(in range: NSRange, with attrString: NSAttributedString)
下面的Playground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)
NSMutableString replaceOccurrences(of:with:options:range:)方法 NSMutableString有一个名为replaceOccurrences(of:with:options:range:)的方法。 replaceOccurrences(of:with:options:range:)有以下声明：
用给定的另一个字符串替换给定范围内给定字符串的所有匹配项，返回替换次数。
func replaceOccurrences(of target: String, with replacement: String, options: NSString.CompareOptions = [], range searchRange: NSRange) -> Int
下面的Playground代码显示了如何使用replaceOccurrences(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 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)
答案 4 :(得分：6)
我必须在<b>标签中加粗文字，这就是我所做的：
- (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;
}
答案 5 :(得分：4)
NSMutableAttributedString *result = [[NSMutableAttributedString alloc] initWithString:@"I am a boy."];
[result addAttribute:NSForegroundColorAttributeName value:[UIColor blackColor] range:NSMakeRange(0, [result length])];
NSMutableAttributedString *replace = [[NSMutableAttributedString alloc] initWithString:@"a"];
[replace addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(0, [replace length])];
[result replaceCharactersInRange:NSMakeRange(5, [replace length]) withAttributedString:replace];
答案 6 :(得分：3)
快捷键4： 将sunkas更新为Swift 4的出色解决方案，并包含在“扩展名”中。只需将其裁剪到您的ViewController中（在类外部）并使用它即可。
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
}
}
答案 7 :(得分：2)
我发现所有其他答案都不起作用。以下是我如何替换类别扩展中的NSAttributed字符串的内容：
<div class="container">
<div id="left">
blah blah balah blah blah.......
</div>
<div id="right">
<fieldset class="form">
<legend class="fit-title-blackgrad">Defaulter List Selection</legend>
<div>
<label class="form-label">Select Semester</label>
<select class="form-input selecttodiv" name="dsem" id="dsem" tabindex="1" required=""><option value="">------</option><option value="I">I</option><option value="II">II</option><option value="III">III</option><option value="IV">IV</option><option value="V">V</option><option value="VI">VI</option><option value="VII">VII</option><option value="VIII">VIII</option> </select>
</div>
<div>
<label class="form-label">From (Month)</label>
<select class="form-input" name="dfmonth" id="dfmonth" tabindex="2" required=""><option value="">------</option><option value="7">July</option> </select>
</div>
<div>
<label class="form-label">Cut-Off Percentage........................</label>
<input class="form-input" type="number" min="50" max="75" name="dcutoff" id="dcutoff" tabindex="4" value="75" required="">
</div>
<div>
<input type="submit" class="button form-button" value="Load">
</div>
</fieldset>
</div>
</div>答案 8 :(得分：2)
我有一个具体要求，并按如下所示进行修复。这可能会对某人有所帮助。
要求：在情节提要中，富文本直接添加到UITextView的属性中，其中包含单词“ App Version：1.0”。现在，我必须通过从信息plist读取版本号来对其进行动态化。
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/修改了attributedText。