ios 将 NSMutableAttributedString 转换为 NSString
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Convert NSMutableAttributedString to NSString
提问by tech_human
Can we not convert NSMutableAttributedStringto NSString?
我们不能转换NSMutableAttributedString为NSString?
I have two NSMutableAttributedStringsand I am appending the 2nd string onto 1st as below:
我有两个NSMutableAttributedStrings，我将第二个字符串附加到第一个字符串，如下所示：
[string1 appendAttributedString:string2];
[string1 appendAttributedString:string2];
Since I have to display string1 on a label I do:
因为我必须在标签上显示 string1，所以我这样做：
self.label1.text = (NSString *)string1;
I am getting "unrecognized selector sent to instance"error.
我收到"unrecognized selector sent to instance"错误。
Am I doing anything wrong here? Isn't this the correct way to assign a NSMutableAttributedStringto text property of a label?
我在这里做错了什么吗？这不是NSMutableAttributedString为标签的文本属性分配 a 的正确方法吗？
回答by rmaddy
You can't use a cast to convert an object from one type to another. Use the provided method:
您不能使用强制转换将对象从一种类型转换为另一种类型。使用提供的方法：
label1.text = [string1 string];
Better yet, use the attributed string:
更好的是，使用属性字符串：
label1.attributedText = string1
回答by Juraj Antas
NSAttributtedStringincludes a .stringproperty. From there, you can take NSStringwithout attributes.
NSAttributtedString包括.string财产。从那里，你可以NSString不带属性。
So:
所以：
NSAttributtedString* someString;
NSString* string = someString.string;
回答by Mohammad Parvez
NSAttributtedString have a property string and it is read only property you can not change it.
NSAttributtedString 有一个属性字符串，它是只读属性，您不能更改它。
NSAttributtedString* attributtedString;
NSString* plainString = attributtedString.string;
回答by Kampai
Apart from @rmaddy's answer, mine case is different here.
除了@rmaddy 的回答，我的情况在这里有所不同。
Actually I used NSMutableAttributedStringin JSON parsing to send details on server.
实际上我NSMutableAttributedString在 JSON 解析中用于在服务器上发送详细信息。
At parsing time I got exception because NSMutableAttributedStringcontains information about other attributes too, like color space. Because of that it wont parse.
在解析时，我遇到了异常，因为也NSMutableAttributedString包含有关其他属性的信息，例如color space. 因此它不会解析。
I tried many other ways but finally got solution to get string using below code:
我尝试了很多其他方法，但最终得到了使用以下代码获取字符串的解决方案：
// "amountString" is NSMutableAttributedString string object
NSMutableAttributedString *mutableString = (NSMutableAttributedString *)amountString;
amountValueString = [mutableString string];
amountValueString = [NSString stringWithFormat:@"%@", amountString];
NSRange fullRange = NSMakeRange(0, amountString.length);
NSAttributedString *attStr = [mutableString attributedSubstringFromRange:fullRange];
NSDictionary *documentAttributes = @{NSDocumentTypeDocumentAttribute:NSPlainTextDocumentType};
NSData *textData = [attStr dataFromRange:fullRange documentAttributes:documentAttributes error:NULL];
NSString *amountValueString = [[NSString alloc] initWithData:textData encoding:NSUTF8StringEncoding];
