ipad上的Air Printing崩溃

Question

我在ipad上打印遇到了问题。我的代码第一次完美地打印了pdf文件；但当我第二次打印pdf文件时，应用程序冻结了，然后崩溃。

Below is my code:
    NSData *myPdfData = [NSData dataWithContentsOfFile:pdfPath]; 
    UIPrintInteractionController *controller = [UIPrintInteractionController sharedPrintController];
    if (controller && [UIPrintInteractionController canPrintData:myPdfData]){
        controller.delegate = delegate;
        UIPrintInfo *printInfo = [UIPrintInfo printInfo]; 
        printInfo.outputType = UIPrintInfoOutputGeneral; 
        printInfo.jobName = [pdfPath lastPathComponent];    
        printInfo.duplex = UIPrintInfoDuplexLongEdge; 
        controller.printInfo = printInfo;
        controller.showsPageRange = YES;
        controller.printingItem = myPdfData;    

        // We need a completion handler block for printing.
        UIPrintInteractionCompletionHandler completionHandler = ^(UIPrintInteractionController *printController, BOOL completed, NSError *error) {
            if(completed && error){
                NSLog(@"FAILED! due to error in domain %@ with error code %u", error.domain, error.code);
            }
        };

        [controller presentFromRect:[sender frame] inView:senderView animated:YES completionHandler:completionHandler];
    }else {
        NSLog(@"Couldn't get shared UIPrintInteractionController!");
    }

下面是我在设备上的堆栈跟踪：

D

ate/Time:       2011-03-17 20:48:02.523 -0700
OS Version:      iPhone OS 4.3 (8F190)
Report Version:  104

Exception Type:  00000020
Exception Codes: 0x8badf00d
Highlighted Thread:  0

Application Specific Information:
Brighton failed to resume in time

Elapsed total CPU time (seconds): 2.310 (user 0.290, system 2.020), 23% CPU 
Elapsed application CPU time (seconds): 0.000, 0% CPU

Thread 0 name:  Dispatch queue: com.apple.main-thread
Thread 0:
0   libsystem_kernel.dylib          0x30bd2ab0 0x30bc2000 + 68272
1   PrintKit                        0x313f2c1a 0x313df000 + 80922
2   PrintKit                        0x313ee9ea 0x313df000 + 63978
3   PrintKit                        0x313eea90 0x313df000 + 64144
4   PrintKit                        0x313eeab4 0x313df000 + 64180
5   PrintKit                        0x313e4f96 0x313df000 + 24470
6   PrintKit                        0x313e266a 0x313df000 + 13930
7   UIKit                           0x335e3656 0x33311000 + 2958934
8   UIKit                           0x335e904c 0x33311000 + 2981964
9   UIKit                           0x335e8bcc 0x33311000 + 2980812
10  UIKit                           0x335e99fc 0x33311000 + 2984444
11  UIKit                           0x3343460c 0x33311000 + 1193484
12  Foundation                      0x30d306ce 0x30cab000 + 546510
13  CoreFoundation                  0x31c43a40 0x31bce000 + 481856
14  CoreFoundation                  0x31c45ec4 0x31bce000 + 491204
15  CoreFoundation                  0x31c4683e 0x31bce000 + 493630
16  CoreFoundation                  0x31bd6ebc 0x31bce000 + 36540
17  CoreFoundation                  0x31bd6dc4 0x31bce000 + 36292
18  GraphicsServices                0x32dbf418 0x32dbb000 + 17432
19  GraphicsServices                0x32dbf4c4 0x32dbb000 + 17604

如果有人能帮我弄清楚这个问题，那就太好了。

提前感谢！

Answer 1

线索就在这里：“布赖顿没能及时复职。”

打印完成后，控制权将返回给您的应用程序，但您需要很长时间才能做出响应。iOS认为你已经停止响应输入并终止你的应用程序。