Use of a third-level controller in IOS development and custom label Toolbar

Use of a third-level controller in IOS development and custom label Toolbar

Level 3 controller concept: UITabBarController-> (Management) UINavigationController --> (Management) UIViewController

I will share with you the usage of Level 3 controllers.

# Import "MainTabbarController. h"

 

# Import "ProfileViewController. h"

# Import "GroupViewController. h"

# Import "SearchViewController. h"

# Import "CommentViewController. h"

# Import "MessageViewController. h"

 

@ Interface UITabBarController ()

 

@ End

 

@ Implementation UITabBarController

 

 

-(Void) viewDidLoad {

 

// Create a level-3 Controller

[Self _ creatView];

 

// Customize the label Toolbar

[Self _ newInitTabbar];

 

 

}

// Create a level-3 Controller

-(Void) _ creatView {

 

 

// 1. Create a View Controller and add the View Controller to the array.

ProfileViewController * profileCtrl = [[[ProfileViewController alloc] init] autorelease];

 

 

GroupViewController * groupCtrl = [[[GroupViewController alloc] init] autorelease];

SearchViewController * searchCtrl = [[[SearchViewController alloc] init] autorelease];

CommentViewController * commentCtrl = [[[CommentViewController alloc] init] autorelease];

MessageViewController * messageCtrl = [[MessageViewController alloc] init] autorelease];

// Store the View Controller in an array

NSArray * viewCtrls = @ [profileCtrl, groupCtrl, searchCtrl, commentCtrl, messageCtrl];

 

// 2. Create a navigation controller, assign the View Controller to the navigation controller for management, and add the navigation controller to an array.

NSMutableArray * navCtrls = [[NSMutableArray alloc] init];

For (int I = 0; I <5; I ++ ){

 

// Obtain the View Controller

UIViewController * viewCtrl = viewCtrls [I];

 

// Create a navigation Controller

UINavigationController * navCtrl = [[UINavigationController alloc] initWithRootViewController: viewCtrl];

[NavCtrl. navigationBar setBackgroundImage: [UIImage imageNamed: @ "navbar_bg_normal"] forBarMetrics: UIBarMetricsDefault];

[NavCtrls addObject: navCtrl];

 

}

 

// 3. Create a tag controller and hand it over to the tag controller for management

Self. viewControllers = navCtrls;

}

// Customize the label Toolbar

 

-(Void) _ newInitTabbar {

 

// (1) Remove the button from the toolbar

// Retrieve all subviews on the tabbar

NSArray * views = [self. tabBar subviews];

For (UIView * view in views ){

[View removeFromSuperview];

}

 

// (2) set the background

Self. tabBar. backgroundImage = [UIImage imageNamed: @ "navbg"];

 

// (3) create button

CGFloat width = [UIScreen mainScreen]. bounds. size. width;

// The width of each button

CGFloat w = width/5;

For (int I = 0; I <5; I ++ ){

UIButton * button = [UIButton buttonWithType: UIButtonTypeCustom];

NSString * imageName = [NSString stringWithFormat: @ "% d", I + 1];

[Button setImage: [UIImage imageNamed: imageName] forState: UIControlStateNormal];

// Set frame

Button. frame = CGRectMake (w-42)/2 + w * I, 2, 42, 45 );

// Add a click event

[Button addTarget: self action: @ selector (buttonAction :) forControlEvents: UIControlEventTouchUpInside];

[Self. tabBar addSubview: button];

}

 

// (4) create a selected Image

_ SelectedImg = [[UIImageView alloc] initWithImage: [UIImage imageNamed: @ "selected"];

_ SelectedImg. frame = CGRectMake (w-53)/2.0, 2, 53, 45 );

[Self. tabBar addSubview: _ selectedImg];

 

}

 

// Button click event

-(Void) buttonAction :( UIButton *) button {

 

// Switch the View Controller

Self. selectedIndex = button. tag;

 

// Animation

[UIView beginAnimations: nil context: nil];

[UIView setAnimationDuration:. 2];

 

_ SelectedImg. center = button. center;

 

[UIView commitAnimations];

 

}