Handling In-Call Status Bar with Custom Modal Presentation

Question

The Problem

I\'ve noticed some strange behavior when presenting a UINavigationController (with a root view controller, already pushed, naturally) with

Answer 1

I have spent far too much time on over coming the status bar height issue and have come up with a general solution that works for me and I think will work for your situation as well.

First, a couple things that are odd about the status bar.

1. It's normally 20 points tall and the screen is normally 568 points tall

2. While "in-call", the status bar is 40 points high and the screen is 548 points tall

3. While the status bar is hidden, the status bar is 0 points tall and the screen is 568 points tall

If the status bar changes but you don't update the height of the screen then the calculations will be off, and this can be seen in some pretty big name (and even default) applications.

So, the solution that I've come up with is two fold: 1. Create a macro to get the adjusted screen height 2. Register a notification to update the view when the status bar changes.

Here are the macros, I'd recommend putting these in your prefix file

#define kScreenWidth     [UIScreen mainScreen].bounds.size.width
#define kStatusBarHeight (([[UIApplication sharedApplication] statusBarFrame].size.height == 20.0f) ? 20.0f : (([[UIApplication sharedApplication] statusBarFrame].size.height == 40.0f) ? 20.0f : 0.0f))
#define kScreenHeight    (([[UIApplication sharedApplication] statusBarFrame].size.height > 20.0f) ? [UIScreen mainScreen].bounds.size.height - 20.0f : [UIScreen mainScreen].bounds.size.height)

Additionally, here's the notification center call that I've found works for me 100% of the time the status bar changes.

NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
[nc addObserver:self.view selector:@selector(layoutSubviews) name:UIApplicationWillChangeStatusBarFrameNotification object:nil];