ios 调用打印机

源码
无意中玩一个demo发现调用了打印机才发现ios有快速调用打印机的功能.
 1 if ([UIPrintInteractionController isPrintingAvailable] == YES)
 2     {
 3         NSURL *fileURL = document.fileURL; // Document file URL
 4 
 5         if ([UIPrintInteractionController canPrintURL:fileURL] == YES)
 6         {
 7             printInteraction = [UIPrintInteractionController sharedPrintController];
 8 
 9             UIPrintInfo *printInfo = [UIPrintInfo printInfo];
10             printInfo.duplex = UIPrintInfoDuplexLongEdge;
11             printInfo.outputType = UIPrintInfoOutputGeneral;
12             printInfo.jobName = document.fileName;
13 
14             printInteraction.printInfo = printInfo;
15             printInteraction.printingItem = fileURL;
16             printInteraction.showsPageRange = YES;
17 
18             if (userInterfaceIdiom == UIUserInterfaceIdiomPad) // Large device printing
19             {
20                 [printInteraction presentFromRect:button.bounds inView:button animated:YES completionHandler:
21                     ^(UIPrintInteractionController *pic, BOOL completed, NSError *error)
22                     {
23                         #ifdef DEBUG
24                             if ((completed == NO) && (error != nil)) NSLog(@"%s %@", __FUNCTION__, error);
25                         #endif
26                     }
27                 ];
28             }
29             else // Handle printing on small device
30             {
31                 [printInteraction presentAnimated:YES completionHandler:
32                     ^(UIPrintInteractionController *pic, BOOL completed, NSError *error)
33                     {
34                         #ifdef DEBUG
35                             if ((completed == NO) && (error != nil)) NSLog(@"%s %@", __FUNCTION__, error);
36                         #endif
37                     }
38                 ];
39             }
40         }
41     }