RNReactNativeDocViewer.m

//
//  RNReactNativeDocViewer.m
//  RNReactNativeDocViewer
//
//  Created by Philipp Hecht on 10/03/17.
//  Copyright (c) 2017 Philipp Hecht. All rights reserved.
//
#import <UIKit/UIKit.h>
#import "RNReactNativeDocViewer.h"
#if __has_include("RCTLog.h")
#import "RCTLog.h"
#else
#import <React/RCTLog.h>
#endif


@implementation RNReactNativeDocViewer

RCT_EXPORT_MODULE()

- (dispatch_queue_t)methodQueue
{
  return dispatch_get_main_queue();
}

RCT_EXPORT_METHOD(testModule:(NSString *)name location:(NSString *)location)
{
    RCTLogInfo(@"TEST Module %@ at %@", name, location);
}


RCT_EXPORT_METHOD(openDoc:(NSArray *)array callback:(RCTResponseSenderBlock)callback)
{
    
    __weak RNReactNativeDocViewer* weakSelf = self;
    dispatch_queue_t asyncQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
    dispatch_async(asyncQueue, ^{
        NSDictionary* dict = [array objectAtIndex:0];
        NSString* urlStr = dict[@"url"];
        NSString* filename = dict[@"fileName"];
        NSURL* url = [NSURL URLWithString:urlStr];
        RCTLogInfo(@"Pretending to create an event at %@", url);
        NSData* dat = [NSData dataWithContentsOfURL:url];
        if (dat == nil) {
            if (callback) {
                callback(@[[NSNull null], @"DATA nil"]);
            }
            return;
        }
        NSString* fileName = [url lastPathComponent];
        NSString* fileExt = [fileName pathExtension];
        if([fileExt length] == 0){
            fileName = [NSString stringWithFormat:@"%@%@", fileName, @".pdf"];
        }
        NSString* path = [NSTemporaryDirectory() stringByAppendingPathComponent: fileName];
        NSURL* tmpFileUrl = [[NSURL alloc] initFileURLWithPath:path];
        [dat writeToURL:tmpFileUrl atomically:YES];
        weakSelf.fileUrl = tmpFileUrl;
        
        dispatch_async(dispatch_get_main_queue(), ^{
            QLPreviewController* cntr = [[QLPreviewController alloc] init];
            cntr.delegate = weakSelf;
            cntr.dataSource = weakSelf;
            if (callback) {
                callback(@[[NSNull null], array]);
            }
            UIViewController* root = [[[UIApplication sharedApplication] keyWindow] rootViewController];
            [root presentViewController:cntr animated:YES completion:nil];
        });
        
    });
}

- (NSInteger) numberOfPreviewItemsInPreviewController: (QLPreviewController *) controller
{
    return 1;
}

- (id <QLPreviewItem>) previewController: (QLPreviewController *) controller previewItemAtIndex: (NSInteger) index
{
    return self;
}

#pragma mark - QLPreviewItem protocol

- (NSURL*)previewItemURL
{
    return self.fileUrl;
}



@end