问启动画面不显示

EN

#import <UIKit/UIKit.h>

@class ViewController;

@interface AppDelegate : NSObject <UIApplicationDelegate> {
    UIWindow *window;
    ViewController *viewController;
    UIImageView *splashView;
}

@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) IBOutlet ViewController *viewController;
@property (nonatomic, retain) IBOutlet UIImageView *splashView;

- (void)removeSplash;

@end

#import "AppDelegate.h"
#import "ViewController.h"

@implementation AppDelegate

@synthesize window;
@synthesize viewController;
@synthesize splashView;


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    
    splashView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
    splashView.image = [UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"Splash" ofType:@"png"]];
    [window addSubview:splashView];
    [window bringSubviewToFront:splashView];
    [window makeKeyAndVisible];

    [self performSelector:@selector(removeSplash) withObject:nil afterDelay:5.0];

    [window addSubview:viewController.view];

    return YES;
}

- (void)removeSplash {
    [splashView removeFromSuperview];
    [splashView release];
}

- (void)dealloc {
    [viewController release];
    [window release];
    [super dealloc];
}

@end

splashView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
splashView.image = [UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"Splash" ofType:@"png"]];
if (splashView.image == nil) {
    NSLog(@"splashView is nil");
}