在应用程序启动时通过 splitviewcontroller 呈现模态视图控制器

Question

由于 UISplitViewController 需要成为 rootviewcontroller，因此我尝试在应用启动时以模态方式呈现一个 viewcontroller，以充当用户的登录/欢迎屏幕。显然，我的 AppDelegate.m 中的以下代码应该可以使用 IOS 6：

#import "AppDelegate.h"
#import "WelcomeViewController.h"

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
// Override point for customization after application launch.

WelcomeViewController *modalWelcomeView = [[WelcomeViewController alloc] initWithNibName:@"Welcome" bundle:nil];
[modalWelcomeView setModalPresentationStyle:UIModalPresentationFullScreen];
[self.splitViewController presentViewController:modalWelcomeView animated:NO Completion:nil];

return YES;
}

然而，对于return YES; 上面的行，我得到一个“在'AppDelegate' 类型的对象上找不到属性'splitViewController'”。我怕我在做傻事……

有什么建议吗？非常感谢。

Answer 1

唉，我找到了解决方案，实际上在AppDelegate.m 中需要一种稍微不同的方法

#import "AppDelegate.h"
#import "WelcomeViewController.h"

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
// Override point for customization after application launch.
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
WelcomeViewController *modalWelcomeView = [storyboard instantiateViewControllerWithIdentifier:@"Welcome"];
[self.window makeKeyAndVisible];
[self.window.rootViewController presentViewController:modalWelcomeView animated:NO completion:NULL];

return YES;