Question

I am extremely new to objective c development. I used a tutorial to learn how to add a label at run time, but I’m a little confused how to reference it later.

If I add…

UILabel *myLabel = [[UILabel alloc] initWithFrame:CGRectMake(50, 100, 200, 100)];
myLabel.text = @"My Label";
[self.view addSubview:myLabel];

…in my viewDidLoad method, how can I reference that label from another method on a separate occasion? Unlike C#, I don’t name the label for later reference — so I can’t simply reference the name to set it.

Answer 1

You have to declare an instance variable for the label in your class’s @interface (and optionally also a property for the ivar). Then assign the label to the ivar/property in viewDidLoad and you can use it later in every other method of the class.

Don’t forget to release the label in your -dealloc method. The code in your question leaks memory.