每次我的应用程序处于活动状态时,我都尝试呈现一个视图控制器(密码请求类型视图)。输入正确的密码后,它应该从堆栈中弹出。我尝试推送的密码视图不是初始视图控制器,因此我无法从 AppDelegate 的 applicationDidBecomeActive 访问它。
我还尝试从 MainViewController 的 ViewWillAppear 推送密码视图,但当应用程序变为活动状态时它不会被调用;仅当屏幕刷新时。
过去几天我一直在研究类似的问题,但我仍然不明白正确的方法。我听说我可能无法以这种方式推送视图,因为 applicationDidBecomeActive 可能会在 Storyboard 或 NavigationController 连接/初始化等之前被调用。
如果有人能为我提供推送/呈现视图的正确方法,或者如果有其他地方可以更好地执行此类操作,我将不胜感激。
Solved:我刚刚从故事板中删除了视图并使用了笔尖。我用了:
PasscodeUnlockVC *passcodeUnlock = [[PasscodeUnlockVC alloc] initWithNibName:@"PasscodeUnlockVC" bundle:[NSBundle mainBundle]];
[(UINavigationController *)self.window.rootViewController pushViewController:passcodeUnlock animated:NO];
查看层次结构数据:
(gdb) po [[(id)UIApp keyWindow] recursiveDescription]
<UIWindow: 0x736a4b0; frame = (0 0; 320 480); layer = <UIWindowLayer: 0x7367b40>>
| <UILayoutContainerView: 0x76977a0; frame = (0 0; 320 480); autoresize = W+H; layer = <CALayer: 0x769de60>>
| | <UINavigationTransitionView: 0x7692110; frame = (0 0; 320 480); clipsToBounds = YES; autoresize = W+H; layer = <CALayer: 0x769a8c0>>
| | | <UIViewControllerWrapperView: 0x73868d0; frame = (0 64; 320 416); autoresize = W+H; layer = <CALayer: 0x75510e0>>
| | | | <UIView: 0x76b93e0; frame = (0 0; 320 416); autoresize = W+H; layer = <CALayer: 0x7386850>>
| | <UINavigationBar: 0x73664b0; frame = (0 20; 320 44); clipsToBounds = YES; opaque = NO; autoresize = W; layer = <CALayer: 0x7366550>>
| | | <UINavigationBarBackground: 0x7360ea0; frame = (0 0; 320 44); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x7366520>> - (null)
| | | <UINavigationItemView: 0x76b95e0; frame = (160 21; 0 0); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x76aa8e0>>
| | | <UINavigationItemButtonView: 0x7550650; frame = (5 7; 73 30); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x7368b40>>
Current language: auto; currently objective-c
(gdb)
我建议你使用applicationWillEnterForeground:
, not applicationDidBecomeActive:
,因为它更适合多任务手势。例如,如果用户双击主页按钮以显示任务栏,然后在不更改应用程序的情况下关闭任务栏,则您不希望显示锁定屏幕。
想必你的AppDelegate
has a window
属性,并且您知道窗口的根视图控制器是UINavigationController
.
- (void)applicationWillEnterForeground:(UIApplication *)application {
PasscodeViewController *pvc = [[PasscodeViewController alloc] init];
[(UINavigationController *)self.window.rootViewController pushViewController:pvc animated:NO];
// [pvc release]; if not using ARC
}
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