iOS Development-ui (11) Uitabbarcontroller

Knowledge Points:

1.UITabBarController use

2.UITabBarItem use

About Tabbarcontroller In addition to the contents of this finishing, interested can look at the two I have sent before, in the actual development of practical things.

Basic use of rdvtabbarcontroller and Tabbar to prevent double-click Methodjump from the controller on one item on the Tabbarcontroller to the controller on the other item

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Uitabbarcontroller

1. How to create

2. How to add a Uiviewcontroller to Uitabbarcontroller

3. How to add a Uinavigationcontroller to Uitabbarcontroller

4. How to remember the click order

5. Set and get selected items

@property (nonatomic) Nsuinteger SelectedIndex;

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Uitabbaritem

1.UITabBarItem and Uitabbarcontroller relationships

Tabbaritem is a property of Uiviewcontroller

This property is for Uitabbarcontroller service.

2. Create uitabbaritem for text and pictures

-(ID) Initwithtitle: (NSString *) title

Image: (UIImage *) image

Tag: (nsinteger) tag;

-(Instancetype) Initwithnibname: (NSString *) Nibnameornil Bundle: (NSBundle *) nibbundleornil{if(self =[Super Initwithnibname:nibnameornil Bundle:nibbundleornil]) {//sets the text with the type of the pictureSelf.tabbaritem= [[Uitabbaritem alloc] Initwithtitle:@"Red"Image:[uiimage imagenamed:@"1_selected"] Tag:0]; //set text, select picture and unchecked picture type//Self.tabbaritem = [[Uitabbaritem alloc] initwithtitle:@ "Red" image:[uiimage imagenamed:@ "3_normal"] selectedImage: [UIImage imagenamed:@ "3_selected"];}

Note: The function added after iOS7

-(Instancetype) Initwithtitle: (NSString *) title

Image: (UIImage *) image

SelectedImage: (UIImage *) selectedimage

3. Create the Uitabbarsystemitem that comes with your system

-(ID) Initwithtabbarsystemitem: (Uitabbarsystemitem) Systemitem

Tag: (nsinteger) tag;

// Set System Type  = [[Uitabbaritem alloc] initwithtabbarsystemitem:uitabbarsystemitemtoprated tag:0];

4. Setting the Uitabbaritem logo

@property (nonatomic,copy) NSString *badgevalue

// set up a logo  = [NSString stringWithFormat:@ "%ld",10L];

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Uitabbarcontroller Use note

1.UITabBarController Quantity Limit

1) up to 5 attempts in Tabbarcontroller are allowed

The exceeded system will automatically add a more

2.UITabBarController editing

User can set the display position of each control at will

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Uitabbarcontroller Order

1. Record the viewcontroller of the user's last click

1) Nsuserdefaults effect

Nsuserdefaults objects are used to save, restore application-related preferences, configuration data, and so on

2) Nsuserdefaults creation

+ (Nsuserdefaults *) Standarduserdefaults

3) Store data

-(void) set[data type]:(data type) value Forkey: (NSString *) DefaultName;

4) Synchronizing Data

-(BOOL) synchronize;

5) Read Data

-(data type) [Data type]forkey: (NSString *) DefaultName;

2.UITabBarControllerDelegate use

1) When you are selected

-(void) Tabbarcontroller: (Uitabbarcontroller *) Tabbarcontroller

Didselectviewcontroller: (Uiviewcontroller *) Viewcontroller

#pragmaMark-uitabbarcontrollerdelegate//A controller has been selected-(void) Tabbarcontroller: (Uitabbarcontroller *) Tabbarcontroller Didselectviewcontroller: (Uiviewcontroller *) viewcontroller{NSLog (@"The controller that is currently selected is labeled%ld", Tabbarcontroller.selectedindex); //RecordNsuserdefaults*def =[Nsuserdefaults Standarduserdefaults]; [Def setInteger:tabBarController.selectedIndex Forkey:@"Index"]; //sync to local[def Synchronize];}

2) control Tabbaritem can be selected

-(BOOL) Tabbarcontroller: (Uitabbarcontroller *) Tabbarcontroller

Shouldselectviewcontroller: (Uiviewcontroller *) Viewcontroller;

//prepare to select a controller (whether the controller can be selected)-(BOOL) Tabbarcontroller: (Uitabbarcontroller *) Tabbarcontroller Shouldselectviewcontroller: (UIViewController *) viewcontroller{//Viewcontroller the Controller object to be selected//Tabbarcontroller currently managed columns Controller//NSLog (@ "Currently selected controller is labeled%ld", tabbarcontroller.selectedindex);    /*wrong wording: Do not allow the first controller to be selected if (Tabbarcontroller.selectedindex = = 0) {return no; }     */    if(Viewcontroller = = tabbarcontroller.viewcontrollers[0]) {        returnNO; }    //returns Yes, can be checked, returns no, does not allow selection    returnYES;}

3) The following three methods are mainly used to monitor the edit operation of the view controller in Moreviewcontroller

 #pragmaMark-uitabbarcontrollerdelegate1.//ready to start editing-(void) Tabbarcontroller: (Uitabbarcontroller *) Tabbarcontroller willbegincustomizingviewcontrollers: (NSArray *) viewcontrollers{NSLog (@"willbegincustomizingviewcontrollers");}2.//prepare to finish editing-(void) Tabbarcontroller: (Uitabbarcontroller *) Tabbarcontroller willendcustomizingviewcontrollers: (NSArray *) Viewcontrollers changed: (BOOL) changed{NSLog (@"willendcustomizingviewcontrollers");} 3.//has finished editing-(void) Tabbarcontroller: (Uitabbarcontroller *) Tabbarcontroller didendcustomizingviewcontrollers: (NSArray *) Viewcontrollers changed: (BOOL) changed{//determine if the order has changed    if(changed) {//Record title OrderNsmutablearray*newarr = [NsmutablearrayNew];  for(Uiviewcontroller *ctlinchviewcontrollers)                {[NewArr addObject:ctl.title]; }            //Save to localNsuserdefaults*def =[Nsuserdefaults Standarduserdefaults]; [Def Setobject:newarr Forkey:@"Savearr"];         [Def Synchronize]; }}

iOS Development-ui (11) Uitabbarcontroller