The use of three-level controllers for iOS development and the Custom tab toolbar

Three-level controller concept: uitabbarcontroller-(Management) Uinavigationcontroller---(management) Uiviewcontroller

The following author will share the use of three-level controller

#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 three controller

[Self _creatview];

Customizing the Label toolbar

[Self _newinittabbar];

    

}

Create a Level three controller

-(void) _creatview{

1. Create the 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 the navigation controller and hand over the view controller to the navigation controller and add the navigation controller to an array

Nsmutablearray *navctrls = [[Nsmutablearray alloc] init];

for (int i=0; i<5; i++) {

get the View controller

Uiviewcontroller *viewctrl = viewctrls[i];

creating 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 label controller and give the navigation controller to the tag controller management

      

Self.viewcontrollers = Navctrls;

}

Customizing the Label toolbar

-(void) _newinittabbar {

(1) remove the buttons on the toolbar

get all the child views on the Tabbar

Nsarray *views = [Self.tabbar subviews];

For (UIView *view in views) {

[View Removefromsuperview];

}

(2) setting the background

Self.tabBar.backgroundImage = [UIImage imagenamed:@ "NAVBG"];

(3) Create button

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

// 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 picture

_selectedimg = [[Uiimageview alloc] initwithimage:[uiimage imagenamed:@ " check "];

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

[Self.tabbar addsubview:_selectedimg];

}

// button click event

-(void) Buttonaction: (UIButton *) button {

// Toggle View Controller

Self.selectedindex = Button.tag;

Animation

[UIView Beginanimations:nil Context:nil];

[UIView setanimationduration:.2];

_selectedimg.center = Button.center;

[UIView commitanimations];

}

Use of the three-level controller for iOS development and the Custom label toolbar