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iOS SDK Programming: A Beginner s Guide
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alerts and putting your device to sleep (locking your device) The applicationWillResignActive: method in UIApplicationDelegate executes just prior to your application becoming inactive The applicationDidBecomeActive: method executes just after your application becomes active again For instance, if you are running your application and lock the screen, your application s delegate executes the applicationWillResignActive: method When you later unlock the screen, your application s delegate executes the applicationDidBecomeActive: method The applicationDidEnterBackground and applicationWillEnterForeground methods are available in iOS 40 and later to support applications that use background execution This is Apple s multitasking solution, and there are a number of requirements placed on your application if you want to do background processing See the iOS Application Programming Guide for details Another important method is applicationDidReceiveMemoryWarning iOS devices have limited memory use too much and the operating system will terminate your application But the operating system warns your application first When UIApplication receives this event, it forwards the event to its delegate s applicationDidReceiveMemoryWarning: method The delegate can then handle the application s response to the warning For instance, it might release a shared data structure, empty and free image or data caches, or take other memory reclaiming actions
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UIApplication and UIApplicationDelegate
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Although this is not strictly required, your application should handle the events for becoming active/inactive and for low-memory situations in its UIApplicationDelegate If it does not, Apple might reject your application when submitted for inclusion in the App Store
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Handling Application Interruptions
In this task, you explore the applicationDidReceiveMemoryWarning:, applicationWillResign Active:, and applicationDidBecomeActive: methods in UIApplicationDelegate
1 Add the methods applicationDidReceiveMemoryWarning:, applicationDidBecomeActive:,
and applicationWillResignActive: to AddViewProjectDelegate s implementation (Add ViewProjectAppDelegatem) Add a single NSLog statement to each method The methods should appear similar to Listing 6-4 Listing 6-4 AddViewProjectAppDelegate s three additional methods
-(void)applicationDidReceiveMemoryWarning:(UIApplication *) application { NSLog(@"hey got a memory warning"); } -(void)applicationWillResignActive:(UIApplication *) application { NSLog(@"hey I'm about to resign active status"); } -(void)applicationDidBecomeActive:(UIApplication *) application { NSLog(@"hey I'm active"); } 2 Click Run, and execute the application in the iPhone Simulator 3 Select Hardware | Simulate Memory Warning from the iPhone Simulator s menu 4 Select Hardware | Lock from the iPhone Simulator s menu Unlock and then quit your
application
5 Review the Debugger Console, which should appear similar to Listing 6-5
Listing 6-5
Console output from running application
2010-08-25 11:24:24147 AddViewProject[83787:207] hey I'm active 2010-08-25 11:24:49203 AddViewProject[83787:207] Received simulated memory warning
(continued)
iOS SDK Programming: A Beginner s Guide
2010-08-25 11:24:49203 AddViewProject[83787:207] warning 2010-08-25 11:25:02356 AddViewProject[83787:207] resign active status 2010-08-25 11:25:14290 AddViewProject[83787:207] 2010-08-25 11:25:17336 AddViewProject[83787:207] resign active status
hey got a memory hey I'm about to hey I'm active hey I'm about to
The application executed the applicationDidBecomeActive: method when you started it and then after you unlocked the Simulator It called applicationDidReceiveMemoryWarning: when you selected the Simulate Memory Warning menu item And when the application was about to become inactive after locking, the UIApplicationDelegate executed the applicationWillResignActive: method
Summary
The UIApplication is your application s starting point It is usually the first thing created by the main method in the mainm file The application is always associated with a delegate An application s delegate is a class that implements the UIApplicationDelegate protocol The delegate is where you place code for handling your application s life cycle events A UIApplication has one UIApplicationDelegate When using one of Xcode s templates, the connection between the UIWindow, UIApplication, and UIApplicationDelegate is done for you in the MainWindowxib nib file Moreover, you almost never have to manually create a UIApplication and UIApplicationDelegate, as every project template creates these objects for you You also do not need to worry about having mainm create the application, nor do you need to worry about implementing the application:didFinishLaunchingWithOptions: method, as these methods are almost always generated for you too
UIView and UIViewController
iOS SDK Programming: A Beginner s Guide
Key Skills & Concepts
Understanding the UIView and UIViewController Creating a single view application using the View-based Application template Creating a single view application using the Window-based Application template Understanding an application delegate s root view Setting an application s root view in Interface Builder Setting an application s root view using code Understanding UIView life cycle methods
IViews are how the iOS displays information on the screen The UIView class is responsible for displaying a rectangular area on the screen The UIViewController manages the UIView and is responsible for handling the view s logic The UIViewController is the glue between the view the UIView and your data classes the model There are many UIView subclasses you might work with while developing an iOS application In fact, every graphical component you use on an iOS graphical user interface (GUI) is a UIView subclass Technically speaking, everything is a view But typically, when documentation or some other material refers to a view, it is referring to a content view A content view is a view that has a view controller and is responsible for presenting a screen s worth of user interface
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