Ios UIPrintInteractionController Printingitems-解雇

我已使用此功能成功打印了一份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];
    }

}

当我想打印几个PDF时，我将它们放入一个数组（证书）。在我选择打印机之前，printController对话框将关闭，并且出现以下错误。 “警告：在演示或取消过程中尝试从视图控制器取消！”

我是否需要为printcontroller使用一些delgate方法，或者捕获什么

这是我打印几个PDF文档的尝试

-(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];
    }
}

---

我的错…我应该花更多的时间调试

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

-（iAction）fcPrintAllBtn:（UIButton*）发送方{
[证书删除所有对象]；
适用于（Paxtype*paxArray中的pax）{
[self-createPDFWithPax:pax Balloon:self.edtFlightBalloon.text Landing:self.edtLandingSite.text日期：self.edtFlightDate.text性别：pax.sBookGender PaxTitle:self.edtPaxTitle.text开始：self.edtLaunchSite.text速度：self.edtMaxSpeed.text高度：self.edtMaxAlt.text
距离：self.edtdestance.text]；
NSString*fileName=@“Certificate.PDF”；
NSArray*阵列路径=
NSSearchPathForDirectoriesInDomains(
NSDocumentDirectory，
NSUserDomainMask，
是的）；
NSString*path=[ArrayPath对象索引：0]；
NSString*pdfFileName=[path stringByAppendingPathComponent:fileName]；
NSData*pdfData=[[NSFileManager defaultManager]contentsAtPath:pdfFileName]；
[证书添加对象：pdfData]；
[自印PDF]；
- (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); 
}