Converting to Storyboards Release Notes

StoryboardingisanewwaytocreateuserinterfacesforiOSapplications,beginningwithiOS5andXcode4.2.Usingstoryboards,youcandesigntheviewcontrollersthatcomposeyourapplicationasscenesintheXcodedesigncanvasandvisuallydefinethenavigationbetweenthescenesusingsegues.

ThereareafewstepsyouneedtotaketoconvertanexistingiOSapplicationprojecttousestoryboards.Inaddition,thereareothernewpatternsyoucanadopt.

ConfiguretheApplicationDelegate

Theapplicationdelegateisresponsibleforloadingthestoryboardandmanagingthewindow.Youneedtospecifythenameoftheapplicationdelegateclassin

UIApplicationMain

,andensurethattheapplicationdelegatehasapropertycalled

window

.Ifyoudon’thaveanexistingapplicationdelegateclass,youneedtocreateone.Aminimalimplementationwouldlooklikethis:Listing1-1Minimalapplicationdelegateheaderfile

#import<UIKit/UIKit.h>

@interfaceAppDelegate:NSObject<UIApplicationDelegate>

@property(strong,nonatomic)UIWindow*window;

@end

Listing1-2Minimalapplicationdelegateimplementationfile

#import"AppDelegate.h"

@implementationAppDelegate

@synthesizewindow=_window;

@end

Inthe

main.m

file,settheapplicationdelegateclassin

UIApplicationMain

.Yourexistingmain.mfileprobablylookssomethinglikethis:

#import<UIKit/UIKit.h>

intmain(intargc,char*argv[]){

NSAutoreleasePool*pool=[[NSAutoreleasePoolalloc]init];

intretVal=UIApplicationMain(argc,argv,nil,nil);

[poolrelease];

returnretVal;

}

Changeittolooklikethis:

#import<UIKit/UIKit.h>

#import"AppDelegate.h"

intmain(intargc,char*argv[]){

@autoreleasepool{

returnUIApplicationMain(argc,argv,nil,NSStringFromClass([AppDelegateclass]));

}

}