Question

以下是我用于我的应用程序的内容。这在iOS 7中工作正常，但在iOS 8中崩溃。

使用此方法，我会截取屏幕截图并创建pdf并通过电子邮件发送。

-(void)createPDFfromUIView:(UIView*)aView saveToDocumentsWithFileName:(NSString*)aFilename
{
    // Creates a mutable data object for updating with binary data, like a byte array
    NSMutableData *pdfData = [NSMutableData data];

    // Points the pdf converter to the mutable data object and to the UIView to be converted
    UIGraphicsBeginPDFContextToData(pdfData, aView.bounds, nil);
    UIGraphicsBeginPDFPage();
    CGContextRef pdfContext = UIGraphicsGetCurrentContext();

    // draws rect to the view and thus this is captured by UIGraphicsBeginPDFContextToData
    [aView.layer renderInContext:pdfContext];

    // remove PDF rendering context
    UIGraphicsEndPDFContext();


    [[UINavigationBar appearance] setBarTintColor:[UIColor colorWithRed:30.0/255.0 green:172.0/255.0 blue:254.0/255.0 alpha:1]];


    if ([MFMailComposeViewController canSendMail])
    {
        MFMailComposeViewController *mailer = [[MFMailComposeViewController alloc] init];
        mailer.mailComposeDelegate = self;
        [mailer setSubject:@"Payment Receipt"];

        [mailer addAttachmentData:pdfData mimeType:@"application/pdf" fileName:[NSString stringWithFormat:@"%@",aFilename]];
        NSString *emailBody = @"Payment Receipt";
        [mailer setMessageBody:emailBody isHTML:NO];
        [[mailer navigationBar] setTintColor:[UIColor whiteColor]];


        [self presentViewController:mailer animated:YES completion:nil];
    }
    else
    {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Email error!"
                                                        message:@" You do not have an email address configured in your device"
                                                       delegate:nil
                                              cancelButtonTitle:@"OK"
                                              otherButtonTitles:nil];
        [alert show];

    }


}

当我添加Exception断点时，我可以看到它停在UIGraphicsEndPDFContext()

过去3天一直试图找到解决方案但没有成功。

Answer 1

这是我使用的，它的工作原理。

-(NSData *) createPDFDataFrom:(UIView *) aView 
{
    // Creates a mutable data object for updating with binary data, like a byte array
    NSMutableData *pdfData = [NSMutableData data];

    // Points the pdf converter to the mutable data object and to the UIView to be converted
    UIGraphicsBeginPDFContextToData(pdfData, aView.bounds, nil);
    UIGraphicsBeginPDFPage();
    CGContextRef pdfContext = UIGraphicsGetCurrentContext();

    // draws rect to the view and thus this is captured by UIGraphicsBeginPDFContextToData

    [aView.layer renderInContext:pdfContext];

    // remove PDF rendering context
    UIGraphicsEndPDFContext();
    return pdfData;
}

然后在代码中的另一个位置：

//创建电子邮件地址

        MFMailComposeViewController * mailVC = [[MFMailComposeViewController alloc] init];
        mailVC.mailComposeDelegate = self;

        [mailVC setSubject:[NSString stringWithFormat:@"%@: %@",@"Report",self.graphicContainer.graphicContainerName]];

        [mailVC addAttachmentData:[self createPDFDataFrom:self.baseView] mimeType:@"pdf" fileName:[NSString stringWithFormat:@"%@.pdf",@"Report"]];
        [self presentViewController:mailVC animated:YES completion:nil];
        [mailVC release];

在创建pdf时调用UIGraphicsEndPDFContext时在iOS 8中崩溃

1 个答案: