Question

我需要显示一个视图控制器并拥有当前代码：

    SavedFiles *savedFilesVC = [[[SavedFiles alloc] init] autorelease];
    [self presentModalViewController:savedFilesVC animated:YES];

虽然它出现了这个错误：

2011-09-12 18:38:45.808 iDHSB[248:707] -[iDHSB_MobileAppDelegate presentModalViewController:animated:]: unrecognized selector     
sent to instance 0x1bb880
2011-09-12 18:38:45.825 iDHSB[248:707] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-   
[iDHSB_MobileAppDelegate presentModalViewController:animated:]: unrecognized selector sent to instance 0x1bb880'
*** Call stack at first throw:
(
0   CoreFoundation                      0x3583064f __exceptionPreprocess + 114
1   libobjc.A.dylib                     0x36583c5d objc_exception_throw + 24
2   CoreFoundation                      0x358341bf -[NSObject(NSObject) doesNotRecognizeSelector:] + 102
3   CoreFoundation                      0x35833649 ___forwarding___ + 508
4   CoreFoundation                      0x357aa180 _CF_forwarding_prep_0 + 48
5   iDHSB                               0x00007671 -[iDHSB_MobileAppDelegate actionSheet:clickedButtonAtIndex:] + 140
6   UIKit                               0x3203c03d -[UIActionSheet(Private) _buttonClicked:] + 192
7   CoreFoundation                      0x357a0571 -[NSObject(NSObject) performSelector:withObject:withObject:] + 24
8   UIKit                               0x31f39ec9 -[UIApplication sendAction:to:from:forEvent:] + 84
9   UIKit                               0x31f39e69 -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 32
10  UIKit                               0x31f39e3b -[UIControl sendAction:to:forEvent:] + 38
11  UIKit                               0x31f39b8d -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 356
12  UIKit                               0x31f3a423 -[UIControl touchesEnded:withEvent:] + 342
13  UIKit                               0x31f38bf5 -[UIWindow _sendTouchesForEvent:] + 368
14  UIKit                               0x31f3856f -[UIWindow sendEvent:] + 262
15  UIKit                               0x31f21313 -[UIApplication sendEvent:] + 298
16  UIKit                               0x31f20c53 _UIApplicationHandleEvent + 5090
17  GraphicsServices                    0x31df7e77 PurpleEventCallback + 666
18  CoreFoundation                      0x35807a97 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 26
19  CoreFoundation                      0x3580983f __CFRunLoopDoSource1 + 166
20  CoreFoundation                      0x3580a60d __CFRunLoopRun + 520
21  CoreFoundation                      0x3579aec3 CFRunLoopRunSpecific + 230
22  CoreFoundation                      0x3579adcb CFRunLoopRunInMode + 58
23  GraphicsServices                    0x31df741f GSEventRunModal + 114
24  GraphicsServices                    0x31df74cb GSEventRun + 62
25  UIKit                               0x31f4bd69 -[UIApplication _run] + 404
26  UIKit                               0x31f49807 UIApplicationMain + 670
27  iDHSB                               0x0000232d main + 48
28  iDHSB                               0x000022f8 start + 40
)
terminate called after throwing an instance of 'NSException'
[Switching to process 11779 thread 0x0]

为什么会这样？

我需要做什么？

谢谢，

詹姆斯

Answer 1

试试这个

[self.navigationController pushViewController:viewController animated:YES];

或

[self.view addsubview.viewcontroller.view];

Answer 2

你需要在你的AppDelegate中加载第一个ViewController：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Add the navigation controller's view to the window and display

    self.window.rootViewController = myController;
    [self.window makeKeyAndVisible];
    return YES;
}

在MainWindow.xib文件中（通常）加载和初始化视图控制器。你不能从AppDelegate调用presentModalViewController，你不能只是初始化你的控制器，在大多数情况下你需要initFromNib ..

Answer 3

您不能直接从AppDelegate使用presentModalViewController:animated:。它必须来自UIViewController的实例。这是错误的原因。

Answer 4

[[iDHSB_MobileAppDelegate mainViewController] presentModalViewController:savedFilesVC  animated:YES]

你需要为ex mainViewController创建一个UIViewController说明并将其连接到xib。

如何正确显示UIViewController？

4 个答案: