如何设置启动屏幕的确切时间并在 iPhone 查询中启动时加载？答案

【问题标题】：How to set exact time for splash screen with loading on launch in iPhone query?如何设置启动屏幕的确切时间并在 iPhone 查询中启动时加载？
【发布时间】：2012-01-31 07:19:50
【问题描述】：

在我的地图应用程序中，我在 ViewDidLoad 方法中调用了 Web 服务方法。因此我的如果网络很差，无法在我的第一个屏幕 MapView 上加载 Web 服务数据，则启动屏幕显示时间更长（超过 5 秒）。

我想只显示 Default.png 3 秒，然后我的第一个屏幕显示加载指示器，例如最近在 iPHone 上的 facebook 应用程序。该应用程序背后的逻辑是什么。我尝试了很多东西，但还没有成功。提前致谢。

【问题讨论】：

stackoverflow.com/questions/2254351/iphone-splash-screen

标签： iphone objective-c splash-screen

【解决方案1】：

You will need to use performSelector: withDelay: method and provide the delay to 3-4 seconds, whatever is desired. NSTimer will also work but perfomSelector is a more lighter approach.

Try using it in the function where you allocate the splash image. In this case as u said u need to call from ViewDidLoad another function something like performSelector:removeSplashScreen and put this in [self performSelector:removeSplashScreen afterDelay:4 withObject:imgSplash];

THis will call the removeSplashScreen after 4 seconds and hence pass the splash image as parameter to this function.
 Inside removeSplashScreen do something like this:
-(void)removeSplashScreen:(UIImageView*)imgSplash {

//remove splash hence 4 seconds have passed.
[imgSplash removeFromSupreview];
[imgSplash release];

//After this allocate UIActivityIndicator view or whatever custom view for further loading
//You can also call an NSURLConnection here for the data parsing as the splash has been //removed thereby showing an activity to user.

}

//hope this helps :)
}

【讨论】：

【解决方案2】：

使用 NSTimer 实现此功能。

【讨论】：

【解决方案3】：

首先你把default.png然后

然后像下面的代码一样添加简单的视图控制器

[window addSubview:viewController.view];

您可以在其中添加要放置的活动指标。

然后当 Internet 连接完成然后调用委托方法

-(void)ShowTabAbout{
    [viewController.view removeFromSuperview];  
    self.imgV.frame=CGRectMake(0, 425, 320, 55);
    self.imgV.image=[UIImage imageNamed:@"tBar5.png"];
    [self.tabctr.view addSubview:self.imgV];
    self.tabctr.selectedIndex=4;
    [self animationTabCode];
    [window addSubview:tabctr.view];
}

下面是动画的代码

-(void)animationTabCode{
    CGContextRef context = UIGraphicsGetCurrentContext();
    [UIView beginAnimations:nil context:context];
    [UIView setAnimationTransition: UIViewAnimationTransitionFlipFromRight forView:self.window cache:YES];
    [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
    [UIView setAnimationDuration:0.5];
    [UIView commitAnimations];
}

这种类型的你可以很聪明地创建应用程序

【讨论】：

感谢您的回答。如果我有时间，我会大胆尝试。现在我使用了带有 timedelay 的 performSelector 方法