Question

I’m currently designing an app that calls for dynamically creating objects and then displaying them in a ViewController. My problem is wading through the documentation to try and create the objects I need. I’ve done some searching and even tried to just sit down and figure it out, but alas, I’ve got nothing to show for it. I already know how to dynamically create the ViewController but I can’t seem to get any objects in it.

Does anyone know how I could go about creating objects (Say a button and a slider) dynamically with Objective-C in XCode?

Answer 1

Creating a button in code is simple

- (void)addButton {

    // Create button
    UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];

    // Set the frame (location and size)
    [button setFrame:CGRectMake(0, 0, 40, 30)];

    // Set what happens when you touch the button
    [button addTarget:self action:@selector(buttonPressed) forControlEvents:UIControlEventTouchUpInside];

    // Set button text
    [button.titleLabel setText:@"Button"];

    // Add button to view
    [self.view addSubview:button];

}

A lot of interface elements follow a similar patter- alloc and init the object, set the frame and add it to a view.