如何缩放 UIScrollView 的特定部分?

问题描述

我开发了一个应用程序，我想在其中实现闪屏，在闪屏上我想绑定 scrollView 和 UIImage.我的代码如下，

I develop an application in which I want to implement the splash screen, on that splash screen I want to bind the scrollView and UIImage. My code as follow,

-(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状态.我想在那个空白屏幕上绑定我的 splash.png.

On my given code the one blank window comes up and stay on.I want to on that blank screen bind my splash.png.

****以上问题解决了****我当前的代码是

****The Above problem is solved****My current code is

    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 scrollView 的特定部分.

I want to zoom the particular part of scrollView.

推荐答案

RajB - 为您缩放 scrollView 执行以下操作:

RajB - for your zooming of the scrollView do this:

CGRect zoomRect = CGRectMake(119, 42, 208, 166);
[scrollView zoomToRect:zoomRect animated:YES];

希望这会有所帮助！

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