// MyAppDelegate.h
02#import <UIKit/UIKit.h>
03@classMSCSwitchViewController;
04
05@interface MSCAppDelegate : UIResponder <UIApplicationDelegate>
06
07@property (retain, nonatomic) UIWindow *window;
08@property (nonatomic, retain) MSCSwitchViewController *switchViewController;
09
10@end
11
12// MyAppDelegate.m
13
14#import "MSCAppDelegate.h"
15#import "MSCSwitchViewController.h"
16
17@implementation MSCAppDelegate
18
19@synthesize window = _window;
20@synthesize switchViewController = _switchViewController;
21
22- (void)dealloc
23{
      24[_window release];
      25[_switchViewController release];
      26[super dealloc];
27}
28
29- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
30{
      31// 初始化window，必须用self.window，不可以使用 _window
      32self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
      33_switchViewController = [[MSCSwitchViewController alloc] initWithNibName:@"SwitchView"bundle:nil];
      34// 这两处可以使用self.window，也可以使用 _window
      35[self.window addSubview:_switchViewController.view];
      36[self.window makeKeyAndVisible];
      37returnYES;
38}