使用 == 比较 iOS 中的对象时,比较的是对象的指针。例如有如下比较时:

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NSString *str = @"origin1";
NSString *strCopy = [str copy];
NSString *str1 = [NSString stringWithFormat:@"origin%@", @1];

BOOL equalA = (str == strCopy);
BOOL equalB = (str == str1);

BOOL equalC = [str isEqualToString:str1]; /**< equalC is YES */
BOOL equalD = [str isEqual:str1]; /**< equalD is YES */
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CaryaLiu

宅男一枚, 在前进的道路上.


iOS开发工程师


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