Appending strings within a loop objective-c

Question

I have a for-in loop running unknown num of times, when its finished running I want to have all names appending like so: name1, name2,name3 and so on.

How do I append the strings within the loop ?

I was thinking of something like this :

if (donePressed)
{
    NSString *allFriends;
    selectedFriends = friendPicker.selection;
    for (NSDictionary * friend in selectedFriends)
    {
        NSString * friendName = [friend objectForKey:@"name"];
        // some built-in method that appends friendName to allFriends with a ", " between them
    }

    NSLog(@"%@",selectedFriends);
}

bbum · Accepted Answer · 2013-08-12 16:21:29Z

7

NSString *allFriends = [[friendPicker.selection valueForKey:@"name"] componentsJoinedByString:@", "];

answered Aug 12, 2013 at 16:21

bbum

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2 Comments

Daddy Over a year ago

Nice answer, I should have reloaded the page :-)

bbum Over a year ago

@JustinAmberson OP will probably end up with something closer to your code the first time an entity has a NULL name. My code is a bit fragile in its terseness.

Daddy · Accepted Answer · 2013-08-12 16:29:25Z

4

I would do this:

NSMutableString *nameString = [[NSMutableString alloc]init];
for loop (...) {
    NSString *currentName = [friend objectForKey:@"name"];
    [nameString appendString:[NSString stringWithFormat:@"%@, ",currentName]];
}
NSLog(@"%@",nameString);

The answer above mine looks better, that function probably doesn't leave a trailing , at the end of the list. Mine would have to use NSMakeRange() to trim the trailing comma.

answered Aug 12, 2013 at 16:29

Daddy

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