UIPrintInteractionController Printingitems - Dismisses

Question

我已经使用此功能成功打印了一张PDF：

-(void)printPDF{

    NSString* fileName = @"Certificate.PDF";

    NSArray *arrayPaths =
    NSSearchPathForDirectoriesInDomains(
                                        NSDocumentDirectory,
                                        NSUserDomainMask,
                                        YES);
    NSString *path = [arrayPaths objectAtIndex:0];
    NSString* pdfFileName = [path stringByAppendingPathComponent:fileName];


    void (^completionHandler)(UIPrintInteractionController *, BOOL, NSError *) =
    ^(UIPrintInteractionController *pic, BOOL completed, NSError *error) {
        if (!completed && error) NSLog(@"Print error: %@", error);
    };

    NSData *pdfData = [[NSFileManager defaultManager] contentsAtPath:pdfFileName];

    printController.printingItem = pdfData;

    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
        [printController presentFromRect:self.btnPrint.frame inView:self.btnPrint.superview
                                animated:YES completionHandler:completionHandler];
    } else {
        [printController presentAnimated:YES completionHandler:completionHandler];
    }

}

当我想打印几张PDF时，我已经放入了一个阵列（证书）。在我选择打印机之前，printController对话框消失了，我收到以下错误。 ＆＃34;警告：正在进行演示或解雇时尝试从视图控制器中解除！＆＃34;

我是否需要为printcontroller使用一些delgate方法，或者什么是catch？

这是我尝试打印多个PDF文档。

-(void)printAllPDF{

    void (^completionHandler)(UIPrintInteractionController *, BOOL, NSError *) =
    ^(UIPrintInteractionController *pic, BOOL completed, NSError *error) {
        if (!completed && error) NSLog(@"Print error: %@", error);

    };

    printController.printingItems = certificates;

    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
        [printController presentFromRect:self.btnPrintAll.frame inView:self.btnPrintAll.superview
                                animated:YES completionHandler:completionHandler];

    } else {
        [printController presentAnimated:YES completionHandler:completionHandler];
    }
}

Answer 1

我很糟糕......我应该花更多时间调试。

我实际上是在我的“数组循环”中调用PrintPDF ... 起来......对不起： - （

- (IBAction)fcPrintAllBtn:(UIButton *)sender {

    [certificates removeAllObjects];

    for (Paxtype *pax in paxArray) {
        [self createPDFWithPax:pax Balloon:self.edtFlightBalloon.text Landing:self.edtLandingSite.text Date:self.edtFlightDate.text Gender:pax.sBookGender PaxTitle:self.edtPaxTitle.text Start:self.edtLaunchSite.text Speed:self.edtMaxSpeed.text Altitude:self.edtMaxAlt.text
                      Distance:self.edtDistance.text];
        NSString* fileName = @"Certificate.PDF";

        NSArray *arrayPaths =
        NSSearchPathForDirectoriesInDomains(
                                            NSDocumentDirectory,
                                            NSUserDomainMask,
                                            YES);
        NSString *path = [arrayPaths objectAtIndex:0];
        NSString* pdfFileName = [path stringByAppendingPathComponent:fileName];
        NSData *pdfData = [[NSFileManager defaultManager] contentsAtPath:pdfFileName];

        [certificates addObject:pdfData];

        [self printAllPDF];   <-----This should not be here !!!

    }

    [self printAllPDF];   <-----But here !!

    NSLog(@"Certificates %i", certificates.count); 
}