我正试图用下列方法从一个NSMuvatableAray天体中删除任何含有空间的元素:
[searchCriteria removeObject:[NSString stringWithString:@" "]];
我得到了一个例外," -[ NSArayI 移除目标::: 未知的选择器被发送到实例中。"我做错了什么?
EDIT: OK, so I tried the following
NSPredicate* predicate = [NSPredicate predicateWithFormat:@"SELF NOT CONTAINS "];
NSArray *nonEmptyElements = [searchCriteria filteredArrayUsingPredicate: predicate];
并获取错误, 无法解析格式字符串“ 自己不包含” 。
我该如何指定一个空字符串, 排在内装物之后?
你有一个普通的NSANRAR,而不是NSMMableArAR。也许在某个时候,你认为你曾经被复制或序列的NSNSMETRARAR, 导致一个不可改变的阵列。
顺便说一句,正如Lauteris所说, 这将过滤只包含一个空格的字符串。 要过滤任意一个空格的字符串, 您会希望按照他所说的方式进行。 如果您想要过滤出单空格字符串, 写< code\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
You should use an NSPredicate to filter out any items with space. See here how to do this: https://stackoverflow.com/a/1057202/312312
您应该使用自我包含的上游, 而不是以示例所用的自我开头 。
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