Question

I am wanting to create a custom UIView class that will show a dynamic number of UISegmentedControl objects depending on some input. For example, if a client has 5 products in their cart, the UIView should generate 5 UISegmentedControl objects that I will then link with each item.

The problem I am having is getting this to work in a UIView. Here is what I have done so far. I am successfully able to create a UISegmentedControl object and display it programmatically within my main UIViewController. I don’t get any display when adding it to my UIView class. Here is the implementation code for the UIView class:

#import "ajdSegmentView.h"

@implementation ajdSegmentView

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
        NSArray *itemArray = [NSArray arrayWithObjects:@"Yes", @"No", nil];

        UISegmentedControl *button = [[UISegmentedControl alloc] initWithItems:itemArray];
        button.frame = CGRectMake(35,44, 120,44);
        button.segmentedControlStyle = UISegmentedControlStylePlain;
        button.selectedSegmentIndex = 1;

        [self addSubview:button];
    }
    return self;
}
@end

I created a new UIView object via Storyboard and placed it inside the UIViewController scene. I made sure to set the class from the generic UIView class to my new custom class. I added and outlet for the UIView in my UIViewController class. Here is the code inside the implementation of UIViewController:

#import "ajdViewController.h"

@interface ajdViewController ()

@end

@implementation ajdViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    self.segmentView = [[ajdSegmentView alloc] init];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

That’s all I have tried. I have been searching through a lot of pages and trying to implement this without asking here, but I seem to be looking in the wrong places.

Answer 1

You’re initializing your custom view using the init method, but your initialization for ajdSegmentView is in your initWithFrame: method (which in your case is not getting called).

So replace:

self.segmentView = [[ajdSegmentView alloc] init];

with:

// Change the frame to what you want
self.segmentView = [[ajdSegmentView alloc] initWithFrame:CGRectMake(0,0,100,40)];

Also don’t forget to add your view to the view controller’s view also.

[self.view addSubview:self.segmentView];

Unless this view is being created with interface builder, in which case you will need to override initWithCoder: in your ajdSegmentView class.

I’m not familiar with Storyboard though, so maybe I’m missing something, but in a standard scenario what I said above will solve your problem.