How to create a controller

Three ways to create:

1. Create through code (personal advice: Although the code is cumbersome to create, but still feel that the code is king)

2. Create with Xib:

Pros: The ability to use drag controls to describe the situation inside a view

Cons: You need to set the owning custom controller in the class attribute of file ' s owner and set the view (wired) of the controller compared to storyboard

3. Create with Storyboard

Advantage: can use drag control to describe a view inside the case, if set storyboard for Mainstoryboard, you can eliminate the code to create window, etc., the system assembly automatically generated

1 //How code is created2 3 #import "LMPAppDelegate.h"4 #import "LMPOneViewController.h"5 6 @implementationlmpappdelegate7 8-(BOOL) Application: (UIApplication *) application didfinishlaunchingwithoptions: (Nsdictionary *) Launchoptions9 {Ten     //Create Window OneSelf.window =[[UIWindow alloc] Initwithframe:[uiscreen mainscreen].bounds]; A     //Set window color to white -Self.window.backgroundColor =[Uicolor Whitecolor]; -     //Setting the window root controller theSelf.window.rootViewController =[[Lmponeviewcontroller alloc] init]; -      -     //Display window - [Self.window makekeyandvisible]; +      -     returnYES; +}

1 //Storyboard How to create2 3 #import "LMPAppDelegate.h"4 #import "LMPOneViewController.h"5 6 @implementationlmpappdelegate7 8-(BOOL) Application: (UIApplication *) application didfinishlaunchingwithoptions: (Nsdictionary *) Launchoptions9 {Ten     //Create Window OneSelf.window =[[UIWindow alloc] Initwithframe:[uiscreen mainscreen].bounds]; A     //Set window color to white -Self.window.backgroundColor =[Uicolor Whitecolor]; -      the     //load storyboard,@ "One" to storyboard file name, nil defaults to [NSBundle Mainbundle] -Uistoryboard *one = [Uistoryboard storyboardwithname:@" One"Bundle:nil]; -      -     //get the controller that the storyboard arrow refers to + //Uiviewcontroller *VC = [one instantiateinitialviewcontroller]; -      +     //obtain the controller with the identifier @ "other" in the storyboard
      Note: The controller that I use is the controller that comes with the system, it is best to define a controller
 AUiviewcontroller *VC = [one instantiateviewcontrollerwithidentifier:@" Other"]; at      -     //Setting the window root controller -Self.window.rootViewController =VC; -     -     //Display window - [Self.window makekeyandvisible]; in      -     returnYES; to}

1 //xib How to create2 3 #import "LMPAppDelegate.h"4 #import "LMPOneViewController.h"5 6 @implementationlmpappdelegate7 8-(BOOL) Application: (UIApplication *) application didfinishlaunchingwithoptions: (Nsdictionary *) Launchoptions9 {Ten     //Create Window OneSelf.window =[[UIWindow alloc] Initwithframe:[uiscreen mainscreen].bounds]; A     //Set window color to white -Self.window.backgroundColor =[Uicolor Whitecolor]; -      the     //load the Xib file, note what type of controller is returned by the class setting in the Xib file -     //actively loading a xib file -Lmponeviewcontroller *VC = [[Lmponeviewcontroller alloc] Initwithnibname:@" Both"Bundle:nil]; -      +     /* - Lmponeviewcontroller *VC = [[Lmponeviewcontroller alloc] init]; + Rule successively: A The default is the first loaded with the name @ "Lmponeview" of the xib, not to find the name @ "Lmponeviewcontroller" of the Xib, at If there is no system will automatically generate a blank view -       - Note: If the change is not effective because you did not uninstall the emulator software, and it is best to clean in Xcode -       -      */ -      in     //Setting the window root controller -Self.window.rootViewController =VC; to     +     //Display window - [Self.window makekeyandvisible]; the      *     returnYES; $}

How to create a controller