如何缩放uiScrollView的特定部分?

你好, 我开发了一个应用程序,在这个应用程序中,我想实现启动屏幕,在启动屏幕上,我想绑定滚动视图和uiimage。我的代码如下,

-(void)splashAnimation{
    window = [[UIWindow alloc] initWithFrame:CGRectMake(0, 0, 320, 420)];
    //scrollView = [[UIScrollView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]];
    scrollView = [[UIScrollView alloc] initWithFrame:[window bounds]];
    scrollView.pagingEnabled = NO;
    scrollView.bounces = NO;

    UIImage *image = [UIImage imageNamed:@"splash.png"];
    UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
    imageView.userInteractionEnabled = NO;  

    [scrollView addSubview:imageView];
    [scrollView setDelegate:self];
    //[scrollView release];


}

- (void)applicationDidFinishLaunching:(UIApplication *)application {    
    [self splashAnimation];
    [self initControllers];
    [window addSubview:[mainTabBarController view]];
    [window makeKeyAndVisible];
}

在我给定的代码上,一个空白窗口出现并保持打开。 我想在空白屏幕上绑定splash.png。

****以上问题已解决**** 我当前的代码是

    scrollView.pagingEnabled = NO;
    scrollView.bounces = NO;

    UIImage *image = [UIImage imageNamed:@"splash.png"];
    UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
    imageView.userInteractionEnabled = NO;  
    [scrollView addSubview:imageView];

    scrollView.maximumZoomScale = 4.0f;
    scrollView.minimumZoomScale = 1.0f;

    CGRect rect = CGRectMake(119, 42, 208, 166);

    [scrollView zoomToRect:rect animated:YES];
    [scrollView setDelegate:self];
    [window addSubview:scrollView];
    [window makeKeyAndVisible];

我想缩放滚动视图的特定部分。