Changing Label with Button Press

[TheDog]

Hello all,

I just created my first basic app and am looking to build upon it. I currently have a homepage with 2 buttons: A button saying "Say Hi" and a settings button. The "Say Hi" button shows a label which has the string "Hello World" on it. The Settings button takes you to another view. This view allows you to choose a color such as red or blue. Once you choose the color, you are taken back to the main page. Then, when you press "Say Hi" the string changes to the appropriate color.

Now I was wondering how I could code a button on the settings page to change the content of the label. So after pressing the button on the settings page you are taken back to the home page after which you press "Say Hi" and the string changes its content not color.

I am really stuck here as I am still fairly new to iPhone programming. Any help would be greatly appreciated.

Thanks,
TheDog

[Domele]

I think the best way to do this would be to create a protocol. Pro: It would allow you to reuse your color picker. Con: In my experience, noobs don't like to touch them with a 10 foot pole.

Basically, a protocol is a list of methods. These methods can be marked required or optional. Your settings page would have a delegate property. When the user leaves your settings page, your settings page would inform the delegate of the color the user chose through a method call. Something like

- (void)colorPickerDidFinishWithColor:(UIColor *)chosenColor;

Edit: Here is a link that explains delegates/protocols further and shows you how to implement it all: http://iphonedevelopertips.com/objec...delegates.html

[TheDog]

Thanks! Is there a different way if I do not mind losing the Color Picker?

[Domele]

Yes but in the long run, you'd save more time writing good code. It'll allow you to easily reuse your objects in later projects. Plus when you want to add or remove something, it's not a pita.

The quick and dirty really bad way (read: avoid, try to never ever use) would be to set a UIColor property in your 1st controller. Present the settings view controller as a modal view. Then when the user clicks done, reference the 1st view controller by using the parentViewController property of your view controller, and set its UIColor property.

But really since you are learning, why learn how to do it the wrong way? If you are learning, your focus should not be how to do something the quickest, it should be writing clean code and understanding how it works.

[TheDog]

Ok thanks!