話不多說直接上代碼:

在AppDelegate.m中

@interface AppDelegate ()<WXApiDelegate>
{
    UIView *launchView;
}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    //設(shè)置rootViewController的代碼
    [self configLaunchImage];
    return YES;
}
 
- (void)configLaunchImage {
    
    UIViewController *vc = [[UIStoryboard storyboardWithName:@"LaunchScreen" bundle:[NSBundle mainBundle]] instantiateInitialViewController];
    launchView = vc.view;
    UIWindow *mainWindow = [UIApplication sharedApplication].keyWindow;
    launchView.frame = [UIApplication sharedApplication].keyWindow.frame;
    [mainWindow addSubview:launchView];
    UIImageView *imageView=[[UIImageView alloc]init];
    [imageView sd_setImageWithURL:[NSURL URLWithString:@"http://pic15.nipic.com/20110628/1369025_192645024000_2.jpg"]];
    //根據(jù)需求添加約束最好
    imageView.frame = CGRectMake(0, 0, mainWidthWJ, mainHeightWJ);
    imageView.backgroundColor=[UIColor whiteColor];
    [launchView addSubview:imageView];
    [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(removeLaunchImage) userInfo:nil repeats:NO];
}
 
-(void)removeLaunchImage
 
{
    [launchView removeFromSuperview];
    //設(shè)置rootViewController的代碼

}

接下來在LaunchScreen.storyboard設(shè)置下identifier 如圖所示

屏幕快照 2019-03-28 15.11.27.png

OK大功告成!!!!