Detecting if user has in call status bar

How do I detect if user is in-call or tethering? I have a subview for iAd like this:

_UIiAD = [[self appdelegate] UIiAD];
_UIiAD.delegate = self;

[_UIiAD setFrame:CGRectMake(0,470,320,50)];
[self.view addSubview:_UIiAD];\

And it sets it wrong when the user is in call? How do I detect this?

UIApplicationDelegate has these two methods.

// ObjC
- (void)application:(UIApplication *)application willChangeStatusBarFrame:(CGRect)newStatusBarFrame;   // in screen coordinates
- (void)application:(UIApplication *)application didChangeStatusBarFrame:(CGRect)oldStatusBarFrame;

// Swift
func application(_ application: UIApplication, willChangeStatusBarFrame newStatusBarFrame: CGRect)
func application(_ application: UIApplication, didChangeStatusBarFrame oldStatusBarFrame: CGRect)

And there are Notifications too.

//ObjC
UIApplicationWillChangeStatusBarFrameNotification
UIApplicationDidChangeStatusBarFrameNotification

// Swift
Notification.Name.UIApplicationWillChangeStatusBarFrame
Notification.Name.UIApplicationDidChangeStatusBarFrame

but they're not posted on the launch of the app, so I wouldn't recommend it.

The simulator has an useful tool to test that.

Hardware->Toggle In-Call Status Bar (⌘Y)

I would suggest you to implement those methods on your AppDelegate file. They will be called when the status bar change it's height. One of them it's called before and the other after the change.

Assuming you want that your ViewController to be notified when the change occurs, one option, is to send notifications. Like this

First, add this property/variable on AppDelegate

// ObjC
@property (assign, nonatomic) CGRect currentStatusBarFrame;

// Swift
var currentStatusBarFrame: CGRect = .zero

then, implement willChangeStatusBarFrame

// ObjC
- (void) application:(UIApplication *)application willChangeStatusBarFrame:(CGRect)newStatusBarFrame
{
    self.currentStatusBarFrame = newStatusBarFrame;
    [[NSNotificationCenter defaultCenter] postNotificationName:@"Status Bar Frame Change"
                                                        object:self
                                                      userInfo:@{@"current status bar frame": [NSValue valueWithCGRect:newStatusBarFrame]}];

}

// Swift
func application(_ application: UIApplication, willChangeStatusBarFrame newStatusBarFrame: CGRect) {
    currentStatusBarFrame = newStatusBarFrame
    NotificationCenter.default.post(
        name: NSNotification.Name(rawValue: "Status Bar Frame Change"),
        object: self,
        userInfo: ["current status bar frame": newStatusBarFrame])
}

And we're done with the base of our Status Bar Frame Checker. The next part you implement on any ViewController that needs to know the status bar frame.

Any time you want to get the status bar frame, you do like so

// ObjC
[(AppDelegate*)[[UIApplication sharedApplication] delegate] currentStatusBarFrame]

// Swift
(UIApplication.shared.delegate as! AppDelegate).currentStatusBarFrame

And to be notified when it changes, add this to ViewDidLoad method.

In ObjC

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(statusBarFrameChanged:)
                                             name:@"Status Bar Frame Change"
                                           object:[[UIApplication sharedApplication] delegate]];

And implement this method

- (void) statusBarFrameChanged:(NSNotification*)notification
{
    CGRect newFrame = [[notification.userInfo objectForKey:@"current status bar frame"] CGRectValue];
    NSLog(@"new height %f", CGRectGetHeight(newFrame));
}

In Swift

    NotificationCenter.default.addObserver(forName: NSNotification.Name(rawValue: "Status Bar Frame Change"),
                                           object: nil,
                                           queue: nil) { (note) in
                                            guard let currentStatusBarFrame = note.userInfo?["current status bar frame"] as? CGRect else {return}
                                            print("New Height", currentStatusBarFrame.height)
    }