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我创建了一个 的子类UIView，现在在我的应用程序中我需要从中呈现一个UIViewController，

我试过以下：

poiInfoController = [[poiInfoController alloc]initWithNibName:@"poiInfoController" bundle:nil];
[poiInfoController setModalPresentationStyle:UIModalPresentationFormSheet];
[[[[UIApplication sharedApplication] keyWindow] rootViewController] presentModalViewController:poiInfoController animated:YES];

但由于未捕获的异常“NSInvalidArgumentException”，它会在终止应用程序时崩溃，原因：“应用程序试图以模态方式呈现活动控制器。”

请帮忙，

**EDIT CRASH LOG:**

2014-04-23 17:04:26.433 NavigationLibSprintMoM[4610:a0b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Application tried to present modally an active controller <ViewController: 0x9d52140>.'
*** First throw call stack:
(
    0   CoreFoundation                      0x017c15e4 __exceptionPreprocess + 180
    1   libobjc.A.dylib                     0x014d08b6 objc_exception_throw + 44
    2   UIKit                               0x0036217a -[UIViewController presentViewController:withTransition:completion:] + 4879
    3   UIKit                               0x00362caf -[UIViewController presentViewController:animated:completion:] + 130
    4   NavigationLibSprintMoM              0x00005f7b -[NavigationView handleGesture:] + 964
    5   UIKit                               0x005baf8c _UIGestureRecognizerSendActions + 230
    6   UIKit                               0x005b9c00 -[UIGestureRecognizer _updateGestureWithEvent:buttonEvent:] + 383
    7   UIKit                               0x005bb66d -[UIGestureRecognizer _delayedUpdateGesture] + 60
    8   UIKit                               0x005bebcd ___UIGestureRecognizerUpdate_block_invoke + 57
    9   UIKit                               0x005beb4e _UIGestureRecognizerRemoveObjectsFromArrayAndApplyBlocks + 317
    10  UIKit                               0x005b5248 _UIGestureRecognizerUpdate + 199
    11  UIKit                               0x00281d4a -[UIWindow _sendGesturesForEvent:] + 1291
    12  UIKit                               0x00282c6a -[UIWindow sendEvent:] + 1030
    13  UIKit                               0x00256a36 -[UIApplication sendEvent:] + 242
    14  UIKit                               0x00240d9f _UIApplicationHandleEventQueue + 11421
    15  CoreFoundation                      0x0174a8af __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15
    16  CoreFoundation                      0x0174a23b __CFRunLoopDoSources0 + 235
    17  CoreFoundation                      0x0176730e __CFRunLoopRun + 910
    18  CoreFoundation                      0x01766b33 CFRunLoopRunSpecific + 467
    19  CoreFoundation                      0x0176694b CFRunLoopRunInMode + 123
    20  GraphicsServices                    0x038699d7 GSEventRunModal + 192
    21  GraphicsServices                    0x038697fe GSEventRun + 104
    22  UIKit                               0x0024394b UIApplicationMain + 1225
    23  NavigationLibSprintMoM              0x0000374d main + 141
    24  libdyld.dylib                       0x01f54725 start + 0
    25  ???                                 0x00000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
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