SDCAlertView and UIViewController with UIButton

Question

I have to display a custom iOS 7-style alert requester with a set of custom buttons (category filter toggles to be specific) in the center. For this, I've found the excellent SDCAlertView on GitHub. My approach is to create a custom UIViewController, which handles the creation of buttons and the button touches, instantiate it, then insert into the alert's contentView like this:

SDCAlertView *alert = [[SDCAlertView alloc] initWithTitle:@"Filter"
                                                  message:nil
                                                 delegate:self
                                        cancelButtonTitle:@"Clear"
                                        otherButtonTitles:@"Filter", nil];

GKSecondViewController *vc = [[GKSecondViewController alloc] init];
UIView *view = vc.view;
[alert.contentView addSubview:view];
[view sdc_centerInSuperview];

[alert.contentView sdc_pinHeight:100];
[alert.contentView sdc_pinWidth:100];
[alert.contentView setBackgroundColor:[UIColor redColor]];

[alert show];

My view controller (GKSecondViewController) looks like this:

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        [self.view setBackgroundColor:[UIColor grayColor]];
        [self.view setTranslatesAutoresizingMaskIntoConstraints:NO];

        [self.view sdc_pinHeight:100];
        [self.view sdc_pinWidth:100];

        UIButton *button = [[UIButton alloc] init];
        [button setTitle:@"Button" forState:UIControlStateNormal];
        [button addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tap:)]];
        [button setTranslatesAutoresizingMaskIntoConstraints:NO];

        [button sdc_pinHeight:100];
        [button sdc_pinWidth:100];

        [self.view addSubview:button];

        [button sdc_centerInSuperview];
    }
    return self;
}

- (void)tap:(UIGestureRecognizer *)gesture
{
    gesture.view.backgroundColor = [UIColor blackColor];
}

(You may need SDCAutoLayout too.) When I click on the button in the alert, it crashes with no hints in the tracelog. What do I miss or do wrong?

score 1 · Answer 1 · answered Jan 24 '14 at 01:15

I don't believe you can take a view controller's view and add it to some other view hierarchy.

In your case, I would not use GKSecondViewController. I would create the buttons in the view controller of your object, and use target/action to talk back to the same view controller. If you must use GKSecondViewController, SDCAlertView would have to support view controller containment, which it doesn't at this point.

SDCAlertView and UIViewController with UIButton

1 Answers1