UIAlertController background color iOS10

Question

Code that I wrote for iOS9, worked really well:

UIAlertController* alert = [UIAlertController alertControllerWithTitle:@"Select source"
                                                                   message:nil
                                                            preferredStyle:UIAlertControllerStyleActionSheet];
    alert.view.backgroundColor = DARK_BLUE;
    alert.view.tintColor = NEON_GREEN;
    UIView *subview = alert.view.subviews.firstObject;
    UIView *alertContentView = subview.subviews.firstObject;
    alertContentView.backgroundColor = DARK_BLUE;
    alertContentView.layer.cornerRadius = 10;

My point of view is that UIAlertController is inheriting from UIViewController, and UIViewController have property UIView that can be changed. And this is working. Now, that view inherited from UIViewController have it's own subview that is contentView showed as Alert. I can access it as firstObject in array of subviews. Now, why message for sending background color isn't working anymore? Do anyone know some new solution?

Thank you for answer, but explanation here is same, accessing content view from subviews array. It shows now yellow blurred color. Not original. — Stefan, Oct 04 '16 at 12:49

Stefan · Accepted Answer · 2016-10-04T13:15:09.163

For everyone that will bump into the same problem, I've found the solution:

UIAlertController.view contains one subview, that is only container.

That subview contains subview that contains two it's own subviews, one is container, and another is layer for blurring it.

So, it needs for in loop to iterate through that two subviews and change background color of both.

Full code:

UIAlertController* alert = [UIAlertController alertControllerWithTitle:@"Select source"
                                                                   message:nil
                                                            preferredStyle:UIAlertControllerStyleActionSheet];
    alert.view.tintColor = NEON_GREEN;

    UIView *firstSubview = alert.view.subviews.firstObject;

    UIView *alertContentView = firstSubview.subviews.firstObject;
    for (UIView *subSubView in alertContentView.subviews) { //This is main catch
        subSubView.backgroundColor = DARK_BLUE; //Here you change background
    }

score 4 · Answer 2 · answered Oct 06 '16 at 15:05

In Swift 3.0

let FirstSubview = alertController.view.subviews.first
    let AlertContentView = FirstSubview?.subviews.first
    for subview in (AlertContentView?.subviews)! {
        subview.backgroundColor = UIColor.black
        subview.layer.cornerRadius = 10
        subview.alpha = 1
        subview.layer.borderWidth = 1
        subview.layer.borderColor = UIColor.yellow.cgColor
    }

score 0 · Answer 3 · answered Oct 04 '16 at 12:29

I use this:

    UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"Alert!"
                                                                       message:@"Message of alert"
                                                                 preferredStyle:UIAlertControllerStyleAlert];

        UIAlertAction* defaultAction = [UIAlertAction actionWithTitle:@"Ok" 
                                                                style:UIAlertActionStyleDefault
                                                              handler:^(UIAlertAction * action) {

                                                                  //Your code
                                                              }];
        [alert addAction:defaultAction];

        UIView * topview = alert.view.subviews.firstObject;
        UIView * colorView = topview.subviews.firstObject;
        colorView.backgroundColor = [UIColor yellowColor];
        colorView.layer.cornerRadius = 10;
        [self presentViewController:alert animated:YES completion:nil];

Sorry, but the approach is pretty same as sample code of mine. And I tried it, it shows yellow color, but blurred, I need original. — Stefan, Oct 04 '16 at 12:49
Then I suggest you to implement your custom uialertcontroller, faster way — Pol, Oct 04 '16 at 13:04
I've found the solution, check my own answer, it could help if you bump into the same problem. — Stefan, Oct 04 '16 at 13:10

UIAlertController background color iOS10

3 Answers3

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