iphone - 从 appdlication 中的缓存目录加载图像在 App 委托(delegate)中完成方法

Question

我试图在启动图像消失后加载图像。所以我想在应用程序中添加一个 ImageView 到 self.window 完成启动方法。我从缓存目录中选择图像。但它在加载之前显示空白屏幕 Root View Controller 。我怎样才能实现这个这是我的代码，用于将图像添加到 imageview，然后将 ImageView 作为 subview 添加到 self.window....

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    documentsDirectory = [documentsDirectory stringByAppendingPathComponent:@""];
    imgView.frame=CGRectMake(0, 0, 768, 1024);

    NSString *URLImg = [documentsDirectory stringByAppendingPathComponent:@"SplashIpad.png"];
    UIImage *imgAvtar = [[UIImage alloc]initWithContentsOfFile:URLImg];
    [imgView setImage:imgAvtar];
    [self.window addSubview:imgView];

请建议我如何在启动画面关闭后加载图像。

Answer 1

按照您的逻辑和代码，您可以这样做:-

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
    self.viewController = [[[clsViewController alloc] initWithNibName:@"clsViewController" bundle:nil] autorelease];



    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    documentsDirectory = [documentsDirectory stringByAppendingPathComponent:@""];
    NSLog(@"do ==%@",documentsDirectory);

    NSString *URLImg = [documentsDirectory stringByAppendingPathComponent:@"index.jpg"];

    NSLog(@"==%@",URLImg);
    UIImage *imgAvtar = [[UIImage alloc]initWithContentsOfFile:URLImg];

    UIImageView *imgView=[[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 150, 150)];
    [imgView setImage:imgAvtar];
    imgView.center=self.viewController.view.center;

   // UIImage *imgAvtar = [UIImage imageNamed:@"index.jpg"];

    [self.viewController.view addSubview:imgView];
     self.window.rootViewController = self.viewController;
    [self.window makeKeyAndVisible];
    return YES;
}

演示链接:在演示中，我从 NSBundal 获取图像，但您可以在 didFinishLaunchingWithOptions 方法中使用我的上述逻辑

http://www.sendspace.com/file/8srobj

注意:-

确保在 /iPhone Simulator/6.0/Applications/8886B938-3EFB-4F0C-96F9-41ACAE508F2B/Library/Caches/index.jpg 路径中名为 index 的图像.jpg 放置在catch文件夹中