在Iphone的简历上的启动画面

Question

我想在应用程序从后台恢复时在我的应用程序上添加启动画面。这可能吗？提前致谢

Answer 1

您可以在-[UIApplicationDelegate applicationWillResignActive:]更新视图堆栈。

当应用程序恢复时，更改将会显示，您可以在-[UIApplicationDelegate applicationDidBecomeActive:]中再次删除初始屏幕。

Answer 2

一些代码与Morten的答案一致。我还想注意，这在模拟器中表现不正常，但是当你在设备上运行它时。模拟器显示黑屏，直到调用removeFromSuperview。

- (void)applicationDidEnterBackground:(UIApplication *)application
{
    // We don't want to show a splash screen if the application is in UIApplicationStateInactive (lock/power button press)
    if (application.applicationState == UIApplicationStateBackground) {
        UIImageView *splash = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"splashimage.png"]];
        splash.frame = self.window.bounds;
        [self.window addSubview:splash];
    }

}

- (void)applicationDidBecomeActive:(UIApplication *)application
{
    // Make sure you do not remove the last view in the event something odd happens
    if ([[self.window subviews] count] > 1) {
        // Not recommended by Apple, but client gets what client wants
        [NSThread sleepForTimeInterval:1.0];
        [[[self.window subviews] lastObject] removeFromSuperview];
    }
}

注意，我使用了applicationDidEnterBackground而不是applicationWillResignActive，因为applicationState有助于区分“按下的主页按钮”和“按下的锁定/电源按钮”。 UIApplicationStateBackground =“按下主页按钮”。