应用程序启动期间显示活动指示

Question

我正在尝试在启动期间添加活动指示器.我确实有一个发射图像,但我宁愿只有一个指标.我将以下内容添加到我的应用代理中,但指标未显示.

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // *******Create activity indicator****
    UIActivityIndicatorView *activity = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(225, 115, 30, 30)];
    [activity setBackgroundColor:[UIColor clearColor]];
    [activity setActivityIndicatorViewStyle: UIActivityIndicatorViewStyleGray];
    [window addSubview: activity];
    [activity release];

    [activity startAnimating];
    activity.hidden = FALSE;
    // *******End activity indicator****

    MainViewController *viewController = [[MainViewController alloc] initWithNibName:@"MainView" bundle:nil];
    self.mainViewController = viewController;

    [window addSubview:[mainViewController view]];
    mainViewController.view.frame = CGRectMake(0, 20, 320, 411);

    [window addSubview:[rootController view]];
    [window makeKeyAndVisible];
#if !TARGET_IPHONE_SIMULATOR
    [application registerForRemoteNotificationTypes: 
     UIRemoteNotificationTypeAlert | UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeSound];
#endif

    application.applicationIconBadgeNumber = 0;

    // Hide indicator
    [viewController release];
    activity.hidden = TRUE;

    [activity stopAnimating];
    return YES;
}

我在2009年回访了这个问题,但解决方案对我不起作用. iPhone-SDK:启动期间的活动指示器？

Answer 1

对于所有需要这个的人,我知道有很多...
(在Xcode版本4.2.1上制作)

所以...

在AppDelegate.h中添加:

@property (nonatomic, strong) UIImageView *splashView;

在AppDelegate.m中添加:

在cours @synthesize splashView页面的顶部;
然后:

- (void) splashFade
{
    splashView = [[UIImageView alloc] initWithFrame:CGRectMake(0,0, 320, 480)];
    splashView.image = [UIImage imageNamed:@"Default.png"];
    [_window addSubview:splashView];
    [_window bringSubviewToFront:splashView];
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:2.0];
    [UIView setAnimationDelay:2.5];
    [UIView setAnimationTransition:UIViewAnimationTransitionNone forView:_window cache:YES];
    [UIView setAnimationDelegate:self]; 
    [UIView setAnimationDidStopSelector:@selector(startupAnimationDone:finished:context:)];
    splashView.alpha = 0.0;
    [UIView commitAnimations];

    //Create and add the Activity Indicator to splashView
    UIActivityIndicatorView *activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];
    activityIndicator.alpha = 1.0;
    activityIndicator.center = CGPointMake(160, 360);
    activityIndicator.hidesWhenStopped = NO;
    [splashView addSubview:activityIndicator];
    [activityIndicator startAnimating];
}

- (void)startupAnimationDone:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context
{
    [splashView removeFromSuperview];
}

在[UIView的setAnimationDelay:2.5]负责splashView有多长在前面由您选择的延迟时间.

您可以通过更改x/y的nubmers来更改指标的位置:
activityIndi​​cator.center = CGPointMake(160,360);

最后,根据方法:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

只需添加:

[self performSelector:@selector(splashFade) withObject:nil];

你去吧:)
希望它有所帮助.

有一个很好的编程....