字符串比较失败 [英] String comparaison fail

问题描述

我是Ios开发的初学者，我正在尝试比较两个正常相等的字符串，但每次比较失败并转到其他地方：

I am a beginner in Ios developement and I'm trying to compare two string who are normaly equal but comparaison fail everytime and go to the else:

NSString *response = [session.channel execute:@"gpio read 0" error:&error];//execute SSH command and write this one in log

NSLog(response);
if ([response isEqualToString:(@"1")]) {
    [session.channel execute:@"gpio write 0 0" error:&error];
} else {
    [session.channel execute:@"gpio write 0 1" error:&error];
}

这是我的输出，响应等于1但不使用if ：

here are my output, response is equal to 1 but the if is not used:

2014-04-08 20：01：38.065 domotiqueRPI [36948：1303] NMSSH：执行命令gpio read 0

2014-04-08 20:01:38.065 domotiqueRPI[36948:1303] NMSSH: Exec command gpio read 0

2014-04-08 20：01：38.108 domotiqueRPI [36948：60b] 1

2014-04-08 20:01:38.108 domotiqueRPI[36948:60b] 1

2014-04-08 20： 01：38.109 domotiqueRPI [36948：1303] NMSSH：执行命令gpio写0 1

2014-04-08 20:01:38.109 domotiqueRPI[36948:1303] NMSSH: Exec command gpio write 0 1

当然我在stackOverFlow上搜索但它告诉了它对我来说：是使用isEqualToString方法

Of course i search on stackOverFlow but all it tell to me : is to use isEqualToString method

推荐答案

您在回复结束时有换行符。试试这个：

You have a newline at the end of the response. Try this:

NSString *response = [session.channel execute:@"gpio read 0" error:&error];
response = [response stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];

这将从响应字符串中删除尾随和前导空格/换行符。

This will remove trailing and leading whitespaces/newlines from the response string.

顺便说一句 - 不需要围绕 @1的括号。

BTW - no need for the parentheses around @"1".

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