用变量追加字符串 [英] Append string with variable

问题描述

我是一个来自Objective-C的java人。在java中，要向字符串添加变量，您必须执行以下操作：

I'm a java guy coming over to Objective-C. In java, to add a variable to a string you'd have to do something along the lines of:

someString = "This string is equal to " + someNumber + ".";

我无法弄清楚如何在Objective-C中做到这一点。我有一个 NSMutableString ，我想添加到字符串的中间。我该怎么做呢？

I can't figure out how to do it in Objective-C though. I have an NSMutableString that I'd like to add to the middle of a string. How do I go about doing this?

我试过：

NSString *someText = @"Lorem ipsum " + someMutableString;
NSString *someText = @"Lorem ipsum " + [someMutableString stringForm];

以及其他一些东西，其中任何一个似乎都不起作用。还用， s互换 + 。

and a few other things, none of which seem to work. Also interchanged the +s with ,s.

推荐答案

你可以使用 appendString：，但一般来说，我更喜欢：

You can use appendString:, but in general, I prefer:

NSString *someText = [NSString stringWithFormat: @"Lorem ipsum %@", someMutableString];
NSString *someString = [NSString stringWithFormat: @"This is string is equal to %d.", someInt];
NSString *someOtherString = [NSString stringWithFormat: @"This is string is equal to %@.", someNSNumber];

或者：

NSString *someOtherString = [NSString stringWithFormat: @"This is string is equal to %d.", [someNSNumber intValue]];

等...

这些字符串是自动释放的，所以要注意不要失去它们的价值。如有必要，请保留或复制它们并稍后自行释放。

These strings are autoreleased, so take care not to lose their value. If necessary, retain or copy them and release them yourself later.

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