CODEWITHSUNDEEP
iosobjective-cuialertview
user4441082
user4441082

Reputation: 371

Tableview display alert error

I am writing a simple tableview app, when tapping the row, a alert shows up. 

(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
    NSString *rowValue =self.greekLetters[indexPath.row];
   // NSString *message=[[NSString alloc] initWithFormat:@"You selected%@!",rowValue];

   if (indexPath.row==0) {
        NSString *message=[[NSString alloc] initWithFormat:@"This is course aaaaa",rowValue];
    }

    if (indexPath.row==1) {
        NSString *message=[[NSString alloc] initWithFormat:@"This is course aaaaa"];
    }


    UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"Course introduction" message:message delegate:nil cancelButtonTitle:@"Return to courses list" otherButtonTitles:nil, nil];

    [alert show];
    [tableView deselectRowAtIndexPath:indexPath animated:YES];

However, Xcode doesn't like my if statement here, while the following statement works.

NSString *message=[[NSString alloc] initWithFormat:@"You selected%@!",rowValue];

Could anyone give me an example of how to use the message here please?

Upvotes: 0

Views: 263

Answers (2)

Josh Gafni
Josh Gafni

Reputation: 2881

This is a problem with scope. You need to declare message before the if statement:

NSString *message;

if (indexPath.row==0) {
    message=[[NSString alloc] initWithFormat:@"This is course aaaaa",rowValue];
}

else if (indexPath.row==1) {
    message=[[NSString alloc] initWithFormat:@"This is course aaaaa"];
}

UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"Course introduction" message:message delegate:nil cancelButtonTitle:@"Return to courses list" otherButtonTitles:nil];

[alert show];
[tableView deselectRowAtIndexPath:indexPath animated:YES];

However, if the course number is determined by the row number do:

NSString *rowValue =self.greekLetters[indexPath.row];

NSString *message = [[NSString alloc] initWithFormat:@"This is course %@",rowValue];

UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"Course introduction" message:message delegate:nil cancelButtonTitle:@"Return to courses list" otherButtonTitles:nil];

[alert show];
[tableView deselectRowAtIndexPath:indexPath animated:YES];

Upvotes: 1

Emil
Emil

Reputation: 7256

You've forgotten to include %@ in the first if-statement.

NSString *message= [[NSString alloc] initWithFormat:@"This is course aaaaa %@",rowValue];

By the way, there's no need to do [[NSString alloc] init] at all, just use [NSString stringWithFormat:...]

Upvotes: 0

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