替换NSAttributedString中的整个文本字符串而不修改其他属性 [英] replace entire text string in NSAttributedString without modifying other attributes

问题描述

我引用了 NSAttributedString ，我想更改属性字符串的文本。

I have a reference to NSAttributedString and i want to change the text of the attributed string.

I我必须创建一个新的 NSAttributedString 并使用这个新字符串更新引用。但是，当我这样做时，我失去了之前字符串的归属。

I guess i have to created a new NSAttributedString and update the reference with this new string. However when i do this i lose the attributed of previous string.

NSAttributedString *newString = [[NSAttributedString alloc] initWithString:text];
[self setAttributedText:newString];

我在中引用了旧的属性字符串self.attributedText 。如何保留新字符串中的先前属性？

I have reference to old attributed string in self.attributedText. How can i retain the previous attributed in the new string?

推荐答案

您可以使用NSMutableAttributedString并只更新字符串，获取属性不要改变。
示例：

You can use NSMutableAttributedString and just update the string, the attributes won't change. Example:

NSMutableAttributedString *mutableAttributedString = [[NSMutableAttributedString alloc] initWithString:@"my string" attributes:@{NSForegroundColorAttributeName: [UIColor blueColor], NSFontAttributeName: [UIFont systemFontOfSize:20]}];

//update the string
[mutableAttributedString.mutableString setString:@"my new string"];

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