How to increase the height of UINavigationBar?

Question

Simple question: How can I increase the height of the navigation bar so that additional widgets will fit in there while keeping the blur?

Examples are the Calendar app where weekday abbreviations are added to the bottom of the navigation bar...

...and in Mail when you move the mail to a different folder:

Answer 1

As iAnurag post ans is correct but still have some ui problem (Width is not proper)

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You can change size by adding category like below

Sample Project
Download

Code

#import "ViewController.h"
@implementation UINavigationBar (customNav)
- (CGSize)sizeThatFits:(CGSize)size {
    CGRect rec = self.frame;
    CGRect screenRect = [[UIScreen mainScreen] bounds];
    rec.size.width = screenRect.size.width;
    rec.size.height = 70;
    return rec.size;
}
@end

Output

When press on "Button"

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Problem in iAnurag Code

Answer 2

https://developer.apple.com/library/prerelease/content/samplecode/NavBar/Introduction/Intro.html

From ReadMe.md:

Extended Navigation Bar #### This example demonstrates placing a custom view underneath the navigation bar in such a manner that view

appears to be part of the navigation bar itself. This technique may be used to create an interface similar to the iOS Calendar app.

My not humble opinion: Don't override sizeThatFits(_:), don't set constraints on nav bar height. Just do the illusion from example above.