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iOS字符串不为空判断

iOS字符串不为空判断

作者: 烟雨酱南 | 来源:发表于2020-04-02 16:18 被阅读0次
- (BOOL)isEmptyStr:(NSString *)string{
    if ( ![string isKindOfClass:[NSString class]]) {
        return YES;
    }
    if (string == nil || string == NULL) {
        return YES;
    }
    if ([string isKindOfClass:[NSNull class]]) {
        return YES;
    }
    if ([[string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]] length]==0) {
        return YES;
    }
    if ([string isEqualToString:@"<null>"]) {
        return YES;
    }
    if ([string isEqualToString:@"(null)"]) {
        return YES;
    }
    if ([[string lowercaseString] isEqualToString:@"null"]) {
        return YES;
    }
    return NO;
}

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