ios - NSString stringByReplacingOccurrencesOfString 失败

Question

我正在尝试使用 stringByReplacingOccurrencesOfString 将一个字符串替换为另一个字符串，但由于某种原因，它给了我这个错误:

-[__NSCFNumber length]: unrecognized selector sent to instance 0x6e49ef0 2012-05-14 16:30:49.741 coop[78129:f803] * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFNumber length]: unrecognized selector sent to instance 0x6e49ef0'

NSString *_currentGroup;
NSString *location = [current objectForKey:@"location"];
if(_currentGroup != nil) 
{
    NSLog(@"_currentGroup: %@", _currentGroup);
    // OUTPUT: _currentGroup: 92

    location = [location stringByReplacingOccurrencesOfString:@"%group_id%" withString:_currentGroup];
}

当我尝试以下操作时，它就起作用了

location = [location stringByReplacingOccurrencesOfString:@"%group_id%" withString:@"anyOtherString"];

我还遗漏了什么吗？

Answer 1

您的“NSString”实际上是一个NSNumber。这就是错误告诉您的内容。