Question

example if there is a method addLabel:

- (void)addLabel {
   for (NSInteger i = 0; i < 5; i ++) {
       UILabel *label = [[UILabel alloc] init];
       [label setText:@"label"];
       [[self view] addSubView:label];
       [label release];
   }
}

and the method is called whenever a button is fired.
Does it need to remove all the label from the subviews first (removeFromSuperView:) before addSubview again?

Answer 1

First, you have to give some coordinate to UILabel. So that, it can display at proper place.

You can use following line for that:

UILabel *lblTaskTitle = [[UILabel alloc] initWithFrame:CGRectMake(45.0, 5, 200.0, 35.0)];

Another thing is that, it will be better if you remove other label. (It’s not necessary, but it’s good practice).

You can do it in following way:

    UILabel *lbl = nil;

    NSArray *Arraylbl = [self.view subviews];
    for (lbl in Arraylbl){
        if ([lbl isKindOfClass:[UILabel class]]){
            [lbl removeFromSuperview];
        }
    }

Hope it will be fine for you.

Let me know in case of any difficulty.