参考文档1
参考文档2
目前多数打印机已经可以支持苹果的AirPrint功能，刚完成的项目使用的打印机自身有相应的SDK ,但相比苹果原生方法就显得麻烦了很多。

• 生成打印图片

 PrintView * printView = [[PrintView alloc] initWithFrame:CGRectMake(0, 0, 3140, 1310) Model:model];
 [self.view addSubview:printView];
 // 将视图添加在控制器上，供截图使用
 UIImage* tempShotImage = [self screenShotImageWithSize:CGSizeMake(3140, 1310) View:printView];
 // 得到视图图层的图片，供打印使用
 [printView removeFromSuperview];
// 截图完成后，移除视图
 [imageArr addObject:tempShotImage];

截图

-(UIImage*)screenShotImageWithSize:(CGSize)ImageSize View:(UIView*)contentView{
   
    UIGraphicsBeginImageContext(ImageSize);
    CGContextRef context = UIGraphicsGetCurrentContext();
    [contentView.layer renderInContext:context];
    //     renderInContext 不安全
    //     drawViewHierarchyInRect 与 renderInContext 功能相同
    //    [contentView drawViewHierarchyInRect:CGRectMake(0, 0, ImageSize.width, ImageSize.height) afterScreenUpdates:YES];
    UIImage* image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;
}

• 开始打印

  //图片以数组形式传递
  [PrintManager printImageWithArr:imageArr
                   ViewController:self
                         ShowRect:CGRectMake(0, 0, 1300, 200)];

打印方法

+(void)printImageWithArr:(NSArray*)imageArr
          ViewController:(UIViewController<UIPrintInteractionControllerDelegate>*)viewController
                ShowRect:(CGRect)showRect{
    
    NSMutableArray* printItems = [NSMutableArray arrayWithCapacity:0];
    for (UIImage* image in imageArr) {
        NSData* imageData = UIImagePNGRepresentation(image);
        // 得到打印数据
        [printItems addObject:imageData];
    }
    
    UIPrintInteractionController *printController = [UIPrintInteractionController sharedPrintController];
    
    if(printController && [UIPrintInteractionController canPrintData: printItems[0]] ) {
        printController.delegate = viewController;
        UIPrintInfo *printInfo = [UIPrintInfo printInfo];
        printInfo.outputType = UIPrintInfoOutputGeneral;
        printInfo.jobName = @"ZBY";
        printInfo.duplex = UIPrintInfoDuplexLongEdge;
        printController.printInfo = printInfo;
        printController.showsPageRange = NO;
        printController.printingItems = printItems;
        
        void (^completionHandler)(UIPrintInteractionController *, BOOL, NSError *) = ^(UIPrintInteractionController *pic, BOOL completed, NSError *error) {
            if (completed)
            {
                // 执行成功后的处理
                
            }
            else if (!completed && error)
            {
                // 执行失败后的处理
            }
        };
        
        
        if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
            [printController presentAnimated:YES completionHandler:completionHandler];
            // iPhone使用这个方法
        }
        if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad) {
            [printController presentFromRect:showRect inView:viewController.view animated:YES completionHandler:completionHandler];
            // iPad使用这个方法
        }
        
    }
    
}

PS: 如果在项目中做成无交互的打印效果可能会更好一些。