如何确定目标C中的字符串是否相等？ [英] How to determine if strings are equal in Objective C?

问题描述

我从JSON结果中读取了一个字符串，如下所示：

I read a string from a JSON result as follows:

NSString *strResult = [[NSString alloc] initWithBytes:[data bytes] 
                                               length:[data length] 
                                             encoding:NSUTF8StringEncoding]; 

然后我尝试确定字符串是否等于值 N

I then try to determine if the string is equal to the value "N"

if ([strResult isEqualToString:@"N"])
{ 
  [lblImageOK setHidden:YES]; 
} 
else 
{ 
  [lblImageOk setHidden:NO]; 
}

if语句始终返回else部分，即使结果为 N 。它们都具有相同的值，但是语句始终返回false。

The if statement allways returns the else part, even though the result is "N". They both have the same value but the statement returns false always.

推荐答案

我找到了一种清除字符串然后检查是否有方法

I found a way to clean the string and then check if they are equal.

NSString *strResult = [[NSString alloc] initWithBytes:[data bytes] 
                                           length:[data length] 
                                         encoding:NSUTF8StringEncoding]; 

strResult = [strResult stringByReplacingOccurrencesOfString:@"\"" withString:@""];
strResult = [strResult stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];

if ([strResult isEqualToString:@"N"])
{ 
  [lblImageOK setHidden:YES]; 
} 
else 
{ 
  [lblImageOk setHidden:NO]; 
}

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