Custom return button on the navigation bar

The buttons in the navigation bar, And the buttons on the right can be added at will. But how do I customize the return button on the left? You will say, add your own button! You can try it.

The correct answer is to overload the pushViewController: animated method of the UINavigationController class.

# Import <UIKit/UIKit. h>

@ Interface MyNavigationController: UINavigationController {

}

@ End

 

# Import "MyNavigationController. h"

 

@ Implementation MyNavigationController

-(Void) popself

{

[Self popViewControllerAnimated: YES];

}

-(UIBarButtonItem *) createBackButton

{

Return [[UIBarButtonItem alloc]

InitWithTitle: @ "return"

Style: UIBarButtonItemStyleBordered

Target: self

Action: @ selector (popself)];

}

-(Void) pushViewController :( UIViewController *) viewController animated :( BOOL) animated

{

[Super pushViewController: viewControlleranimated: animated];

If (viewController. navigationItem. leftBarButtonItem = nil & [self. viewControllers count]> 1 ){

ViewController. navigationItem. leftBarButtonItem = [self createBackButton];

}

}

@ End

 

Replace UINavigationController with MyNavigationController. Or directly create a new category of UINavigationController -- however, this is too poisonous. It affects all navigation controllers. It's better to be human.

Author: kmyhy's column