iOS基础（十五）——判断字典的某个值是否为NSNULL

判断字典的某个值是否为NSNULL

+(BOOL)isJudgeDictionary:(NSString *)string{
    
    if (string==nil || string==NULL) {
        return NO;
    }
    if ([string isKindOfClass:[NSNull class]]) {
        return NO;
    }
    
    if (string.length==0) {
        return NO;
    }
    return YES;
}