Question

I’m trying to programmatically add and position an UIActivityIndicatorView to the bottom right corner of my main view. My app can rotate.

Right now in my viewDidLoad-method I have this code:

[super viewDidLoad];        
UIActivityIndicatorView *iv = [[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
        [iv startAnimating];
        int margin = 14;
        iv.frame = CGRectMake(
                                       self.view.frame.size.width - iv.frame.size.width - margin,
                                       self.view.frame.size.height - iv.frame.size.height - margin,
                                       iv.frame.size.width,
                                       iv.frame.size.height );
    iv.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin;
        [self.view addSubview:iv];

When the app is starting in portrait, the activity-indicator is positioned correctly. As soon as I rotate the device (or start the app in landscape) the positioning of the activityindicator is wrong.

How can this be fixed?

Answer 1

You also need a flexible top margin, so that the view will slip to up or down as the height of the main view changes. Also, the parent view needs  to autoresizesSubviews set to YES (which is default YES, so you are probably ok).

distanceLabel.autoresizingMask = (UIViewAutoresizingFlexibleLeftMargin|UIViewAutoresizingFlexibleTopMargin);