Multiple UIViews, passing methods

Question

I have two UIView contained in a UIViewController - firstView and secondView - that I initialize pragmatically. I have a UILabel in the firstView, and a UIButton in the secondView. I would like the button in the second view to change the label in the first view. In the implementation file of the second view I have the following code:

- (void) changeLabel: (UIButton *) sender{
    firstView *view = [[firstView alloc] init];
    view.label.text = @"Changed Text";
}

However I figured out that the above method just initializes a new class of firstView and does not link to the existing UIView. How can I change properties of firstView from within secondView?

Mike · Accepted Answer · 2014-08-25T21:51:10.870

Create properties in your view controller's header file for the views:

@property (nonatomic, retain) UIView *firstView;
@property (nonatomic, retain) UILabel *label;

When you create the view and label assign them to the properties:

self.firstView = // create your view here

self.label = // create your label here

Create a button property on your UIView object so you can access it later:

@property (nonatomic, retain) UIButton *button;

Then in your view controller file, when you create everything, access the view's button property and add a target, like this:

[firstView.button addTarget:self action:@selector(changeLabel) forControlEvents:UIControlEventTouchUpInside];

Then you can simply have the method your button calls be like this:

- (void)changeLabel {
    self.label.text = @"Changed Text.";
}

Thanks. Still trying to figure it out though. My method for the button is contained inside secondView, thus self.label.text points to secondView and not the ViewController. Is there a way around this? — Amendale, Aug 25 '14 at 21:48

Multiple UIViews, passing methods

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