以编程方式将活动指示器添加到视图 [重复]

Question

可能重复：
Show activity indicator during application launch

全部，

在我的应用程序委托中，我创建了一个使用我的 Default.png 的动画启动视图。一切正常，但我无法弄清楚如何让我的 ActivityIndi​​cator 显示在启动视图的顶部。它只是被启动视图隐藏在那里。这是我所拥有的，谢谢：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
 //... data access stuff here ...

 self.window.rootViewController = self.tabBarController;
[self.window makeKeyAndVisible];

// ... more setup stuff here ...



/****************************************************************************
 *
 *
 * Splash Screen for iPhone
 *
 ****************************************************************************/
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {


    splashView = [[UIImageView alloc] initWithFrame:CGRectMake(0,0, 320, 480)];
    splashView.image = [UIImage imageNamed:@"Default.png"];
    [self.window addSubview:splashView];
    [self.window bringSubviewToFront:splashView];
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:0.5];
    [UIView setAnimationTransition:UIViewAnimationTransitionNone forView:self.window cache:YES];
    [UIView setAnimationDelegate:self];
    [UIView setAnimationDidStopSelector:@selector(startupAnimationDone:finished:context:)];
    splashView.alpha = 0.0;
    splashView.frame = CGRectMake(-60, -60, 440, 600);
    [UIView commitAnimations];


    //Create and add the Activity Indicator to splashView
    UIActivityIndicatorView *activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
    activityIndicator.alpha = 1.0;
    activityIndicator.center = CGPointMake(160, 240);
    activityIndicator.hidesWhenStopped = NO;
    [splashView addSubview:activityIndicator];
    [activityIndicator startAnimating];



}


  return YES;
}

Answer 1

您似乎在 0.5 秒内隐藏 (alpha -> 0.0) 您的 splashView。在这种情况下你应该看到什么？

Answer 2

你试过了吗：

[splashView bringSubviewToFront:activityIndicator];

Answer 3

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

所以……

在 AppDelegate.h 中添加：

@property (nonatomic, strong) UIImageView *splashView;

在 AppDelegate.m 中添加：

在课程页面顶部@synthesize splashView;
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];
}

[UIView setAnimationDelay:2.5] 负责根据您选择的延迟时间，splashView 将在前面多长时间。

你可以通过改变x/y的数值来改变指标的位置：
activityIndi​​cator.center = CGPointMake(160, 360);

最后，在方法下：

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

只需添加这个：

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

你去吧:)
希望对您有所帮助。

祝你编程愉快......