IOS 7 layout layout and transparency effect

I have a few questions. Basically I want to rebuild this view:

During recovery of this, I get strange behavior. Let's start:

My progress first:

Device screenshot:

The structure of My ViewControllers (storyboard):

Ok step by step:

Navigation bar

I tried to make it transparent, and I think it works fine, but as you can see in my structure, I put a UIView on top of my background image (a large profile image) that mimics an alpha overlay. As you can see on my screen “Device Screenshot”, the navigation bar overlaps the overlay. So any idea how to fix this?

the code:

[self.navigationController.navigationBar setBackgroundImage:[UIImage new]
                                                               forBarMetrics:UIBarMetricsDefault];
self.navigationController.navigationBar.shadowImage = [UIImage new];
self.navigationController.navigationBar.translucent = YES;
self.navigationController.navigationBarHidden = NO;

View Positioning

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UIView, -, , . .

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