Multi-Controller management in iOS (ii)-uitabbarcontroller-

Uitabbarcontrolleruitabbarcontroller Introduction

• Similar to Uinavigationcontroller, Uitabbarcontroller can easily manage multiple controllers, easily switch between controllers, typical examples are QQ, and other applications

Uitabbarcontroller simple use of uitabbarcontroller steps

初始化UITabBarController设置UIWindow的rootViewController为UITabBarController根据具体情况，通过addChildViewController方法添加对应个数的子控制器

Uitabbarcontroller Sub-Controller Uitabbarcontroller add a controller in 2 ways add a single sub-controller

- (void)addChildViewController:(UIViewController *)childController;

Set up a sub-controller array

@property(nonatomicNSArray *viewControllers;

Simple creation of Uitabbarcontroller

 //1. Create a window     Self. Window= [[UIWindowAlloc] Initwithframe:[uiscreen Mainscreen]. Bounds];//2. Create Tabbarcontroller    Uitabbarcontroller*tabbarcontroller = [[UitabbarcontrollerALLOC] init];//3. Setting the window root controller     Self. Window. Rootviewcontroller= Tabbarcontroller;//3.1 Create three sub-controllers    Uiviewcontroller*VC1 = [[UiviewcontrollerALLOC] init]; Vc1. View. BackgroundColor= [UicolorRedcolor];Uiviewcontroller*VC2 = [[UiviewcontrollerALLOC] init]; Vc2. View. BackgroundColor= [UicolorGreencolor];Uiviewcontroller*VC3 = [[UiviewcontrollerALLOC] init]; Vc3. View. BackgroundColor= [UicolorBluecolor];//[tabbarcontroller ADDCHILDVIEWCONTROLLER:VC1];    //[tabbarcontroller ADDCHILDVIEWCONTROLLER:VC2];    //[tabbarcontroller ADDCHILDVIEWCONTROLLER:VC3];Tabbarcontroller. Viewcontrollers= @[vc1,vc2,vc3];//4. Display[ Self. WindowMakekeyandvisible];

Uitabbar

• If the Uitabbarcontroller has n sub-controllers, there will be N Uitabbarbutton as child controls inside the Uitabbar

• If the Uitabbarcontroller has 4 sub-controllers, then the Uitabbar structure is roughly as shown

Uitabbarbutton

App Mainstream framework Structure

Segue Introduction

• Each line on the storyboard for interface jumps is a Uistoryboardsegue object (abbreviated segue)

Segue properties for each Segue object, there are 3 properties

唯一标识@property (nonatomicreadonlyNSString *identifier;来源控制器@property (nonatomicreadonlyid sourceViewController;目标控制器@property (nonatomicreadonlyid destinationViewController;

The type of segue according to the Segue execution (jump) moment, segue can be divided into 2 major types

自动型：点击某个控件后（比如按钮），自动执行Segue，自动完成界面跳转手动型：需要通过写代码手动执行Segue，才能完成界面跳转

Automatic type Segue

按住Control键，直接从控件拖线到目标控制器点击“登录”按钮后，就会自动跳转到右边的控制器如果点击某个控件后，不需要做任何判断，一定要跳转到下一个界面，建议使用“自动型Segue”

Manual type Segue

按住Control键，从来源控制器拖线到目标控制器手动型的Segue需要设置一个标识在恰当的时刻，使用perform方法执行对应的Segue

[selfperformSegueWithIdentifier:@"login2contacts"sender:nil];//Segue必须由来源控制器来执行，也就是说，这个perform方法必须由来源控制器来调用

如果点击某个控件后，需要做一些判断，也就是说：满足一定条件后才跳转到下一个界面，建议使用“手动型Segue”

The Performseguewithidentifier method uses the Performseguewithidentifier: method to perform a segue, completing the interface jump next study Performseguewithidentifier: Sender: The full execution of the method

[selfperformSegueWithIdentifier:sender:nil];// 这个self是来源控制器

According to identifier to find the corresponding line in the storyboard, create a new Uistoryboardsegue object

设置Segue对象的sourceViewController（来源控制器）新建并且设置Segue对象的destinationViewController（目标控制器）

Call Sourceviewcontroller The following method, do some pre-jump preparation and pass in the created Segue object

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender;// 这个sender是当初performSegueWithIdentifier:sender:中传入的sender

Call the-(void) Perform of the Segue object; method starts the interface jump operation if the segue style is push

取得sourceViewController所在的UINavigationController调用UINavigationController的push方法将destinationViewController压入栈中，完成跳转

If Segue's style is modal

调用sourceViewController的presentViewController方法将destinationViewController展示出来

Transfer of sender Parameters

Data transfer between controller data transfer controller has 2 main cases: Shun and inverse transmission

控制器的跳转方向: A 往 C数据的传递方向: A 往 C数据的传递方式: 在A的prepareForSegue:sender:方法中根据segue参数取得destinationViewController, 也就是控制器C, 直接给控制器C传递数据(要在C的viewDidLoad方法中取得数据,来赋值给界面上的UI控件)

Reverse transmission

控制器的跳转方向: A 往 C数据的传递方向: C 往 A数据的传递方式: 让A成为C的代理, 在C中调用A的代理方法,通过代理方法的参数传递数据给A

Multi-Controller management in iOS (ii)-uitabbarcontroller-