程式執行起來，歡迎介面之後，會進入AppDelegate，因此我們可以在application: didFinishLaunchingWithOptions:新增程式碼完成想要的效果。連網獲取圖片可以用第三方SDWebImage實現，所以需要先將第三方資料夾匯入。因為顯示廣告的頁面是在歡迎介面基礎上顯示的，因此可以直接利用LaunchScreen.xib中得view，在上面新增一個UIImageView顯示圖片，然後將其加在window上，並顯示在最上層。廣告圖片顯示之後，再將view移除掉，顯示程式的主介面。程式碼如下所示：

#import "AppDelegate.h"

#import "UIImageView+WebCache.h"

@interface AppDelegate ()

@property (strong, nonatomic) UIView *lunchView;

@end

@implementation AppDelegate

@synthesize lunchView;

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

[self.window makeKeyAndVisible];

lunchView = [[NSBundle mainBundle ]loadNibNamed:@"LaunchScreen" owner:nil options:nil][0];

lunchView.frame = CGRectMake(0, 0, self.window.screen.bounds.size.width, self.window.screen.bounds.size.height);

[self.window addSubview:lunchView];

UIImageView *imageV = [[UIImageView alloc] initWithFrame:CGRectMake(0, 50, 320, 300)];

NSString *str = @"http://www.jerehedu.com/images/temp/logo.gif";

[imageV sd_setImageWithURL:[NSURL URLWithString:str] placeholderImage:[UIImage imageNamed:@"default1.jpg"]];

[lunchView addSubview:imageV];

[self.window bringSubviewToFront:lunchView];

[NSTimer scheduledTimerWithTimeInterval:3 target:self selector:@selector(removeLun) userInfo:nil repeats:NO];

return YES;

}

-(void)removeLun

{

[lunchView removeFromSuperview];

}