iphone - 如何在 iOS 中打印照片？

Question

我需要使用 AirPrinter 打印照片并且已经编码，但是照片尺寸有一个问题。打印照片后，我可以看到输出照片尺寸太大 - 正确我想打印 A6（4*6 英寸）照片。

我使用佳能 MG3260 作为 Air Printer。

如果我能解决这个问题，请帮助我。

• 截图 https://www.dropbox.com/s/1f6wa0waao56zqk/IMG_0532.jpg

• 代码

  -(void)printPhotoWithImage:(UIImage *)image {
  
  NSData *myData = UIImageJPEGRepresentation(image, 1.f); UIPrintInteractionController *pic = [UIPrintInteractionController sharedPrintController];
  
  if (pic && [UIPrintInteractionController canPrintData:myData]) {
  
  pic.delegate = self;
  UIPrintInfo *pinfo = [UIPrintInfo printInfo];
  pinfo.outputType = UIPrintInfoOutputPhoto;
  pinfo.jobName = @"My Photo";
  pinfo.duplex = UIPrintInfoDuplexLongEdge;
  
  pic.printInfo = pinfo;
  pic.showsPageRange = YES;
  pic.printingItem = myData;
  
  pic.printFormatter = format;
  [format release];
  
  void(^completionHandler)(UIPrintInteractionController *, BOOL, NSError *) = ^(UIPrintInteractionController *print, BOOL completed, NSError *error) {
  
  [self resignFirstResponder];
  
  if (!completed && error) {
      NSLog(@"--- print error! ---");
  }
  
  };
  
     [pic presentFromRect:CGRectMake((self.view.bounds.size.width - 64) + 27, (self.view.bounds.size.height - 16) + 55, 0, 0) inView:self.view animated:YES completionHandler:completionHandler];
  

  }

   - (UIPrintPaper *)printInteractionController:(UIPrintInteractionController *)printInteractionController choosePaper:(NSArray *)paperList {
  
   CGSize pageSize = CGSizeMake(6 * 72, 4 * 72); return [UIPrintPaper bestPaperForPageSize:pageSize withPapersFromArray:paperList];
  
  }
  

Answer 1

先缩放图像，然后用它来打印

+ (UIImage *)imageWithImage:(UIImage *)image scaledToSize:(CGSize)newSize {
    //UIGraphicsBeginImageContext(newSize);
    UIGraphicsBeginImageContextWithOptions(newSize, NO, 0.0);
    [image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();    
    UIGraphicsEndImageContext();
    return newImage;
}