Question

I iterate trough an Array like that.

NSArray *array = [[currentRaum raumattribute] allObjects];

    NSString *compositeString = [ [ NSString alloc ] init ];
    for( Raumattribute *attr in array ){
        compositeString = [ NSString stringWithFormat:@"%@ %@",compositeString, attr.attributname ];
    [raumAttributLabel setText:compositeString];

I want a output like that —-> Cat,Dog,Mouse

But if i do this:

compositeString = [ NSString stringWithFormat:@"%@ %@,",compositeString, attr.attributname ];

the output is Cat,Dog,Mouse,

or if i do this like that:

compositeString = [ NSString stringWithFormat:@"%@ ,%@",compositeString, attr.attributname ];

the output its ,Cat,Dog,Mouse

Is there a solution?

Answer 1

You can do that using array’s valueForKey: and componentsJoinedByString: methods:

NSString * compositeString =  [[array valueForKey:@"attributname"] componentsJoinedByString:@","]

valueForKey: will create array of attributname values for each array element

componentsJoinedByString: will join those values into one string separated by commas