从appdlication中的caches目录加载图像确实在App委托中完成了方法

Question

我试图在启动图像关闭后加载图像。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。但它在加载前显示一个空白屏幕rootview控制器。 我该如何实现呢 这是我的代码，将图像添加到imageview，然后将图像视图添加到self.window作为子视图....

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];

请建议我在启动画面关闭后如何加载图像。

Answer 1

作为逻辑和代码，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;
}

<强>

DEMO LINK： 在演示中，我从NSBundal获取图像，但您可以在didFinishLaunchingWithOptions方法

上使用我的上述逻辑

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

注意： -

确保/iPhone Simulator/6.0/Applications/8886B938-3EFB-4F0C-96F9-41ACAE508F2B/Library/Caches/index.jpg路径中index.jpg图片的名称为{{1}} palce in catch folder

Answer 2

它可能对你有帮助。拿一个UIViewController并在其中拍摄一个图像视图（从缓存目录加载图像）。在appdelegate中将viewcontroller添加到窗口。如果你没有得到我，请告诉我。