iOS development from beginner to proficient--Navigation controller Basics

Navigation Controller Basics

Implement the navigation bar above, the left button, the middle title, the test button on the right, and a play button

Re-create a vcroot root view controller

#import "AppDelegate.h"#import "VCRoot.h"@interfaceAppdelegate ()@end@implementationappdelegate-(BOOL)Application:(uiapplication *) applicationdidfinishlaunchingwithoptions:(Nsdictionary *) launchoptions {//Override Point forCustomization after application launch. Self.window= [[UIWindow alloc]initWithFrame: [UIScreen mainscreen].bounds];//Create a root view controller vcroot * root = [[Vcroot alloc]init];//Creating a navigation controller//The navigation controller is primarily used to manage switching of multiple view controllers//Hierarchical way to manage multiple view controllers//When creating a controller, be sure to have a root view controller//Parameter one: is the root view controller as the navigation controller Uinavigationcontroller *nav = [[Uinavigationcontroller alloc]Initwithrootviewcontroller: Root];//WillwindowThe root view is set to the navigation controller self.window. Rootviewcontroller =nav; [Self.windowMakekeyandvisible];returnYES;} - (void)applicationwillresignactive:(UIApplication *) Application {//Sent whenThe application isAbout-to-move from active-to-inactive state. This can occur forCertain types ofTemporary interruptions (such as an incoming phone callorSMS message)or  whenThe user quits the application andIt begins the transition to the background state.//Use Thismethod to pause ongoing tasks, disable timers, andThrottle down OpenGL ES frame rates. Games should use Thismethod to pause the game.} - (void)Applicationdidenterbackground:(UIApplication *) Application {//Use Thismethod to release shared resources, save user data, invalidate timers, andStore enough application state information to restore your applicationinch  CaseIt isTerminated later.//If your application supports background execution, ThisMethod isCalled instead of applicationwillterminate: whenThe user quits.} - (void)Applicationwillenterforeground:(UIApplication *) Application {//Called as part ofThe transition from the background to the inactive state; Here you can undo many ofThe changes made onEntering the background.} - (void)applicationdidbecomeactive:(UIApplication *) Application {//Restart any tasks were paused (or  notYet started) whileThe application was inactive. If the application was previouslyinchThe background, optionally refresh the user interface.} - (void)applicationwillterminate:(UIApplication *) Application {//Called whenThe application isAbout to terminate. Save dataifappropriate. See AlsoApplicationdidenterbackground:.}@end

And then:

#import "VCRoot.h"  @interface vcroot ()@end @implementation vcroot - (void) Viewdidload {[SuperViewdidload];additional setup after loading the view.     Self. View. BackgroundColor=[UicolorYellowcolor];//Set title text for navigation bar     Self. Title[Email protected]"Root View";//Set the title of the navigation element item    //If Navigationitem.title is not set, nil    //The system will use Self.title as the title    //If SELF.NAVIGATIONITEM.TITL is not empty    //Set Self.navigationItem.titl as header content     Self. Navigationitem. Title[Email protected]"TITLE";//Create a button on the left side of the navigation bar    //Create a button according to the title text    //p1: Text on a button    //p2: Button style    //P3: Event owner    //P4: Button Event    Uibarbuttonitem*LEFTBTN = [[UibarbuttonitemAlloc] initwithtitle:@"left"Style:uibarbuttonitemstyledone Target: SelfAction@selector(Pressleft)];//Assign a value to the left button of a navigation element item     Self. Navigationitem. Leftbarbuttonitem=LEFTBTN;//Create a button on the right side of the navigation bar    //Create a button according to the system style    //Only to specify style style, the system-style button content or title text cannot be changed    //p1: Button style uibarbuttonsystemitemadd/uibarbuttonsystemitemplay ....    //P2: Event owner    //p3: Button Event    Uibarbuttonitem* RIGHTBTN = [[UibarbuttonitemAlloc] Initwithbarbuttonsystemitem:uibarbuttonsystemitemplay target: SelfAction@selector(Pressright)]; Self. Navigationitem. Rightbarbuttonitem=RIGHTBTN;//Tag Object    UILabel* Label =[[UILabelAlloc]initwithframe:cgrectmake (Ten,Ten, -, +)]; Label. Text[Email protected]"Test"; Label. TextAlignment=nstextalignmentcenter;//method to add any type of control to the navigation button    Uibarbuttonitem* Item03 = [[UibarbuttonitemAlloc]initwithcustomview:label];//Create button array    Nsarray* ARRAYBTN = [NsarrayARRAYWITHOBJECTS:RIGHTBTN,ITEM03,Nil];//Assign a value to the right button array     Self. Navigationitem. Rightbarbuttonitems=ARRAYBTN;} -(void) pressleft{NSLog(@the left button is pressed! ");} -(void) pressright{NSLog(@"right button is pressed!" ");} - (void) Didreceivememorywarning {[SuperDidreceivememorywarning];//Dispose of any resources, can be recreated.}/ * #pragma mark-navigation//in a storyboard-based application, you'll often want to do a little preparation before navigation-(void) Prepareforsegue: (Uistoryboardsegue *) Segue Sender: (ID) Sender {//Get the new view controller using    [Segue Destinationviewcontroller]. Pass the selected object to the new view Controller.} */@end

iOS development from getting started to mastering--Navigation controller Basics