Changing The UINavigationBar Background Image

Answer :

Starting in iOS 5 you should use the -setBackgroundImage:forBarMetrics: method:

[myNavbar setBackgroundImage:[UIImage imageNamed: @"UINavigationBarBackground.png"]                 forBarMetrics:UIBarMetricsDefault]; 

And in Swift 4:

navigationBar.setBackgroundImage(UIImage(named: "UINavigationBarBackground.png"),                for: .default) 

Considering all iOS versions, this seems to be accomplishing both Custom background image and Custom size of UINavigationBar:

@interface CustomNavigationBar : UINavigationBar @end  @implementation CustomNavigationBar -(void) drawRect:(CGRect)rect  {     UIImage *image = [UIImage imageNamed: @"navigationBar"];     [image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];      //for iOS5     [self setBackgroundImage:[UIImage imageNamed: @"navigationBar"] forBarMetrics:UIBarMetricsDefault]; }  //for custom size of the UINavigationBar - (CGSize)sizeThatFits:(CGSize)size {     CGSize newSize = CGSizeMake(320,31);     return newSize; }  @end 

I use such codes in a common place like a Utilities file.

Hope this helps.