How to add image in UINavigationBar in iPhone app

How to add image in UINavigationBar in iPhone app

 +(void)setNavigationBarAppearance{  
   [[UINavigationBar appearance]setBackgroundImage:[UIImage imageNamed:@"image name.png"] forBarMetrics:UIBarMetricsDefault];  
   [[UINavigationBar appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:  
                              [UIColor whiteColor], NSForegroundColorAttributeName,  
                              [UIFont fontWithName:@"Font name" size:17.0], NSFontAttributeName,nil]];  
 }  

To set title view of UINavigationBar use below code

 viewController.navigationItem.titleView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"yourimage.png"]];  

How to disable back swipe gesture in UINavigationController on iOS
From iOS 7 Apple added a new default navigation behavior. You can swipe from the left border of the screen to go back on the navigation stack.
So, It is possible to disable this new gesture in UINavigationController.
Just add this online code and thats it.

  if ([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)])  
     [self.navigationController.view removeGestureRecognizer:self.navigationController.interactivePopGestureRecognizer];  

OR

  if ([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)])  
   self.navigationController.interactivePopGestureRecognizer.enabled = false;  

The edgesForExtendedLayout property, together with the extendedLayoutIncludesOpaqueBars property, determines whether or not view controllers' views underlap top and bottom bars (navigation bar, toolbar)

Extenedges- iOS

This is useful when you are using Storyboard and UINavigationBar & you want to start counting frame after UINavigationBar ends with autolayout.
so just select checkbox of Extenedges - Under top bars and thats it.