可以快速预览的类型：doc、docx、xls、xlsx、pdf、ppt、pptx、txt、以及在苹果设备压缩的zip文件，其余文件只能显示内容大小名称和格式，然后可以通过左下角按钮分享至其他平台进行显示

如果是通过AFNetWorking下载二进制数据保存至本地，需要配置

    manager.responseSerializer.acceptableContentTypes = [NSSet setWithArray:@[@"application/json",
                                                                              @"text/html",
                                                                              @"text/json",
                                                                              @"text/plain",
                                                                              @"text/javascript",
                                                                              @"text/xml",
                                                                              @"image/*",
                                                                              @"application/pdf",
                                                                              @"application/msword",
                                                                              @"application/vnd.ms-powerpoint",
                                                                              @"application/vnd.ms-excel",
                                                                              @"application/vnd.openxmlformats-officedocument.presentationml.presentation",
                                                                              @"application/vnd.openxmlformats-officedocument.wordprocessingml.document",
                                                                              @"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
                                                                              @"application/x-rar-compressed",
                                                                              @"application/zip",
                                                                              @"application/vnd.android.package-archive",
                                                                              @"application/octet-stream"]];

// 系统库

import <QuickLook/QuickLook.h>

这里使用的是本地文件

代理： QLPreviewControllerDelegate,QLPreviewControllerDataSource
- (void)loadDocument:(NSString *)docuName {
   NSString *path = [[NSBundle mainBundle] pathForResource:docuName ofType:nil];
   if (!path) {
       return;
   }
   self.url = [NSURL fileURLWithPath:path];
   
   // 
   PreviewController *preview = [[PreviewController alloc] initWithNibName:@"PreviewController" bundle:nil];
   preview.delegate = self;
   preview.dataSource = self;
//    [self.navigationController pushViewController:preview animated:YES];
   [self presentViewController:preview animated:YES completion:nil];
}

// 显示几份，左右滑动可以查看
- (NSInteger)numberOfPreviewItemsInPreviewController:(QLPreviewController *)controller {
   return  1;
}

// 这里的url，本地获取方法[NSURL fileURLWithPath:path];
// 如果是网络获取的url，https不支持，需要先将文件下载至本地
- (id <QLPreviewItem>)previewController:(QLPreviewController *)controller previewItemAtIndex:(NSInteger)index {
   return self.url; 
}

如果需要隐藏底部工具栏，自定义QLPreviewController的子类并实现下面的方法，但是下面的方法只能隐藏工具栏，对于按钮处理不了
UIToolbar *toolbar = [self getToolBarFromView:self.view];
 toolbar.hidden = YES;

- (UIToolbar *)getToolBarFromView:(UIView *)view {
    // Find the QL ToolBar
    for (UIView *v in view.subviews) {
        if ([v isKindOfClass:[UIToolbar class]]) {
            return (UIToolbar *)v;
        } else {
            UIToolbar *toolBar = [self getToolBarFromView:v];
            if (toolBar) {
                return toolBar;
            }
        }
    }
    return nil;
}