Adding validation to UITextfields

Create the Function Named validate Input &Defined it as Given Below

-(BOOL)validateInput{

    

    BOOL retvalue=YES;

    NSString *throwmessage;

    

    if ([LocationName.text isEqualToString:@""] || LocationName.text==nil ) 

        

    {

        throwmessage=@"Please Enter Location Name";

        retvalue=NO;

    }

    

    else if ([City.text isEqualToString:@""] || City.text==nil ) 

        

    {

        throwmessage=@"Please Enter City ";

        retvalue=NO;

    }

    else if ([Area.text isEqualToString:@""] || Area.text==nil ) 

        

    {

        throwmessage=@"Please Enter Area ";

        retvalue=NO;

    }

    

    else if ([State.text isEqualToString:@""] || State.text==nil ) 

        

    {

        throwmessage=@"Please Enter State";

        retvalue=NO;

    }

    

    else if ([Country.text isEqualToString:@""] || Country.text==nil ) 

        

    {

        throwmessage=@"Please Enter Contact Number ";

        retvalue=NO;

    }

      

    if (retvalue==NO) 

    {

        UIAlertView *alert=[[UIAlertView alloc]initWithTitle:nil message:throwmessage delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];

        [alert show];

        [alert release];       

    }

    return  retvalue;

    

}   

Check 0r call this function When Required

Such AS

-(IBAction)Save{

if([self validateinput]){

}

else{

}