How do I put a UIActivityIndicatorView in a UIAlertController?

Question

We\'re moving away from MBProgressHUD because it\'s too glitchy in our app, and doesn\'t have features such as blocking user input or providing a Cancel button.

So,

Answer 1

Like JonasG mentioned here there is a property named contentViewController and we can use KVC for access

Example :

UIViewController *v = [[UIViewController alloc] init];
v.view.backgroundColor = [UIColor redColor];

[alertController setValue:v forKey:@"contentViewController"];

So here is how your code should looks like (tested and works fine) :

- (IBAction)buttonClicked:(id)sender
{

    self.alertController = [UIAlertController alertControllerWithTitle: @"Loading"
                                                           message: nil
                                                    preferredStyle: UIAlertControllerStyleAlert];


    [self.alertController addAction:[UIAlertAction actionWithTitle: @"Cancel" style: UIAlertActionStyleCancel handler:nil]];


    UIViewController *customVC     = [[UIViewController alloc] init];


    UIActivityIndicatorView* spinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
    [spinner startAnimating];
    [customVC.view addSubview:spinner];


    [customVC.view addConstraint:[NSLayoutConstraint
                           constraintWithItem: spinner
                           attribute:NSLayoutAttributeCenterX
                           relatedBy:NSLayoutRelationEqual
                           toItem:customVC.view
                           attribute:NSLayoutAttributeCenterX
                           multiplier:1.0f
                           constant:0.0f]];



    [customVC.view addConstraint:[NSLayoutConstraint
                           constraintWithItem: spinner
                           attribute:NSLayoutAttributeCenterY
                           relatedBy:NSLayoutRelationEqual
                           toItem:customVC.view
                           attribute:NSLayoutAttributeCenterY
                           multiplier:1.0f
                           constant:0.0f]];


    [self.alertController setValue:customVC forKey:@"contentViewController"];


    [self presentViewController: self.alertController
                         animated: true
                       completion: nil];

}

You can override -preferredContentSize to return a custom size in the view controller that you are setting as contentViewController.

in our case it's customVC

Result:

Want the text to be below the indicator ?

I have created a UIViewController with an xib to act as a custom controller for our contentViewController in the first example we have created the view controller without xib file, Now we can add views using interface builder, I have added an Activity indicator and set the constraints to be centered horizontally and vertically and a label under the activity indicator which is centered horizontally here is my interface builder:

we have less code now:

- (IBAction)buttonClicked:(id)sender
{

    self.alertController = [UIAlertController alertControllerWithTitle: nil
                                                           message: nil
                                                    preferredStyle: UIAlertControllerStyleAlert];

    MyCustomViewController *v     = [[MyCustomViewController alloc] init];

    [self.alertController setValue:v forKey:@"contentViewController"];
    [self presentViewController: self.alertController animated: true  completion: nil];

}

Result :