UINavigationController, uinavigationbar

UINavigationController, uinavigationbar

MASTER:

1. Use UINavigationController: add and remove controllers.

2. UINavigationBar content settings.

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1. add and remove controllers:

1. UINavigationController saves the sub-controller as a stack:

@ Property (nonatomic, copy) NSArray * viewControllers;

@ Property (nonatomic, readonly) NSArray * childViewControllers;

 

2. Use the push method to push a controller to the stack.

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

 

/** Use the following method as a schematic */

-(BOOL) application :( UIApplication *) application didfinishlaunchingwitexceptions :( NSDictionary *) launchOptions
{
Self. window = [[UIWindow alloc] initWithFrame: [UIScreen mainScreen] bounds];
Self. window. backgroundColor = [UIColor whiteColor];

// 1. Create a navigation Controller
XZOneViewController * one = [[XZOneViewController alloc] init];
UINavigationController * nav = [[UINavigationController alloc] initWithRootViewController: one]; // input a stack controller to initialize the navigation controller (commonly used)

　　
// Get the stack top controller (display in front of the Controller)
// Nav. topViewController

// Store the stack of all sub-Controllers
// Nav. viewControllers
// This array also stores the sub-Controller
// Nav. childViewControllers

// 2. Add a sub-Controller
// XZOneViewController * one = [[XZOneViewController alloc] init];
// [Nav addChildViewController: one]; // You can also put one controller in the array viewControllers and childViewControllers.
// [Nav pushViewController: one animated: YES]; // push one to the stack, which is placed in viewControllers and childViewControllers. (Recommended usage, with animation)

// Nav. viewControllers = @ [one]; // This is also set
// Nav. viewControllers = @ [one]; // you cannot do this because viewControllers is read-only.

// 3. set as the root controller of the window
Self. window. rootViewController = nav;

[Self. window makeKeyAndVisible];
Return YES;
}

 

3. You can use the pop method to remove the controller from the stack. // you can remove the controller from the stack.

-(UIViewController *) popViewControllerAnimated :( BOOL) animated;

 

// Return to the specified sub-Controller

-(NSArray *) popToViewController :( UIViewController *) viewController animated :( BOOL) animated;

 

// Return to the root controller (stack Controller)

-(NSArray *) popToRootViewControllerAnimated :( BOOL) animated;

 4. The content in the navigation bar is determined by the navigationItem attribute of the stack top controller. The following attributes of UINavigationItem affect the content in the navigation bar. // the return button in the upper left corner.

@ Property (nonatomic, retain) UIBarButtonItem * backBarButtonItem;

// The title view in the middle

@ Property (nonatomic, retain) UIView * titleView;

// The title text in the middle

@ Property (nonatomic, copy) NSString * title;

// View in the upper left corner

@ Property (nonatomic, retain) UIBarButtonItem * leftBarButtonItem;

 

// View in the upper-right corner

@ Property (nonatomic, retain) UIBarButtonItem * rightBarButtonItem;

 

2. view Structure of the controller and settings of UINavigationBar navigation bar:

1. Scenario 1:

Self. navigationItem. title = @ "first controller ";

UIBarButtonItem * item1 = [[UIBarButtonItem alloc] initWithBarButtonSystemItem: UIBarButtonSystemItemTrash target: nil action: nil];
UIBarButtonItem * item2 = [[UIBarButtonItem alloc] initWithBarButtonSystemItem: UIBarButtonSystemItemCompose target: nil action: nil];

Self. navigationItem. rightBarButtonItems = @ [item1, item2];
Self. navigationItem. leftBarButtonItems = @ [item1, item2];

　　

2. Scenario 2:

Self. navigationItem. titleView = [UIButton buttonWithType: UIButtonTypeContactAdd];
Self. navigationItem. rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem: UIBarButtonSystemItemTrash target: nil action: nil];