Objective-C中的字符串比较 [英] String comparison in Objective-C

问题描述

我目前已经建立了一个网络服务器，该服务器通过SOAP与iPhone应用程序进行通信.我返回的是一个包含GUID的字符串，当我尝试将其与另一个字符串进行比较时，会得到一些奇怪的结果.

I've currently got a webserver set up which I communicate over SOAP with my iPhone app. I am returning a string containing a GUID and when I attempt to compare this with another string I get some strange results.

为什么不触发?当然这两个字符串是匹配的吗?

Why would this not fire? Surely the two strings are a match?

NSString *myString = @"hello world";

if(myString == @"hello world")
    return;

推荐答案

使用-isEqualToString:方法比较两个字符串的值.使用C ==运算符将只比较对象的地址.

Use the -isEqualToString: method to compare the value of two strings. Using the C == operator will simply compare the addresses of the objects.

if ([category isEqualToString:@"Some String"])
{
    // Do stuff...
}

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