Question

我正在尝试在我的Ipad应用程序中使用UIModalPresentationFormSheet，但它并没有成为intellisense中的有效选择，我认为应该这样做。我最近下载了一个新版本的xCode，它似乎只有4.2而不是3.2 SDK - 这是我的问题吗？

这是我想要运行的代码，但它崩溃了：

SignatureViewController *targetController = [[SignatureViewController alloc] init];
targetController.modalPresentationStyle = UIModalPresentationFormSheet;
[self presentModalViewController:targetController animated:YES];

看起来很简单。

编辑：这是崩溃报告：

-[PreviewOrderViewController signOrder]: unrecognized selector sent to instance 0x4ec75f0
2010-11-26 19:30:48.885 RepZioCoreData[37642:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[PreviewOrderViewController signOrder]: unrecognized selector sent to instance 0x4ec75f0'
*** Call stack at first throw:
(
    0   CoreFoundation                      0x0132cbe9 __exceptionPreprocess + 185
    1   libobjc.A.dylib                     0x014815c2 objc_exception_throw + 47
    2   CoreFoundation                      0x0132e6fb -[NSObject(NSObject) doesNotRecognizeSelector:] + 187
    3   CoreFoundation                      0x0129e366 ___forwarding___ + 966
    4   CoreFoundation                      0x0129df22 _CF_forwarding_prep_0 + 50
    5   UIKit                               0x003a8a6e -[UIApplication sendAction:to:from:forEvent:] + 119
    6   UIKit                               0x004371b5 -[UIControl sendAction:to:forEvent:] + 67
    7   UIKit                               0x00439647 -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 527
    8   UIKit                               0x004381f4 -[UIControl touchesEnded:withEvent:] + 458
    9   UIKit                               0x003cd0d1 -[UIWindow _sendTouchesForEvent:] + 567
    10  UIKit                               0x003ae37a -[UIApplication sendEvent:] + 447
    11  UIKit                               0x003b3732 _UIApplicationHandleEvent + 7576
    12  GraphicsServices                    0x01a22a36 PurpleEventCallback + 1550
    13  GraphicsServices                    0x01a22abd PurpleEventSignalCallback + 42
    14  CoreFoundation                      0x0130e01f __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15
    15  CoreFoundation                      0x0126c28b __CFRunLoopDoSources0 + 571
    16  CoreFoundation                      0x0126b786 __CFRunLoopRun + 470
    17  CoreFoundation                      0x0126b240 CFRunLoopRunSpecific + 208
    18  CoreFoundation                      0x0126b161 CFRunLoopRunInMode + 97
    19  GraphicsServices                    0x01a21268 GSEventRunModal + 217
    20  GraphicsServices                    0x01a2132d GSEventRun + 115
    21  UIKit                               0x003b742e UIApplicationMain + 1160

Answer 1

仍适用于我，UIViewController Class Reference

SignatureViewController *targetController = [[SignatureViewController alloc] init];
[targetController setModalTransitionStyle:UIModalTransitionStyleCoverVertical];
[targetController setModalPresentationStyle:UIModalPresentationFormSheet];
[self presentModalViewController:targetController animated:YES];
[targetController release];

偶然的，你的SignatureViewController是什么？ UIViewController？

另外，你能提供一些由Xcode生成的崩溃输出吗？

Answer 2

[PreviewOrderViewController signOrder]就是你的问题，而不是UIModalPresentationFormSheet。

signOrder

中不存在PreviewOrderViewController方法

UIModalPresentationFormSheet不是iPad app 4.2的选项吗？

2 个答案: