Checking String is Null or not in iOS

       Following Method is Useful to check whether String is Empty OR not

#pragma mark String is empty or not

+(BOOL)isEmpty:(NSString *)str

{

    if(str.length==0 || [str isKindOfClass:[NSNull class]] || [str isEqualToString:@""]||[str isEqualToString:NULL]||[str isEqualToString:@"(null)"]||str==nil || [str isEqualToString:@"<null>"]){

        return YES;

    }

    return NO;

}

+(NSString *)getValidStringFrom:(NSString *)string{

    

    if (string == (id)[NSNull null] || string.length == 0 )

        string=@"";

    

    return  string;

}