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

+ (BOOL)isEmptyArray:(NSArray *)array{
    if(array == nil || [array isKindOfClass:[NSNull class]] || array.count == 0){
        return YES;
    }
    return NO;
}