IOS 打开预览pdf、ppt、excel、word、tet、rtf、csv格式的文件，微信文件分享 |
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前言：打开预览pdf、ppt、excel、word、tet、rtf、csv格式的文件有两种一方，一种是利用 UIWebView或者WKWebView 来直接打开，另一种就是利用
QLPreviewController 来打开，但是现在这种方法只能打开本地文件，也就是说如果您是链接，那就需要将文件先下载下来，本文的重点主要讲述第二种方法。
步骤： 1、首先需要判断文件是否需要下载 #pragma mark 判断是否需要下载 - (void)isLoading { NSString *urlStr = _urlStr; NSString *cachesPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask,YES) objectAtIndex:0]; NSString *path = [cachesPath stringByAppendingString:[NSString stringWithFormat:@"/%lu.%@",(unsigned long)[urlStr hash],urlStr.pathExtension]]; _path = path; NSData *data = [NSData dataWithContentsOfFile:path]; if (data == nil) { [self writeToCacheWithUrl:urlStr]; } [self addPreview]; } 2、是否需要写入缓存 #pragma mark 写入缓存 - (void)writeToCacheWithUrl:(NSString *)urlStr { NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:[urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]]; //创建文件管理器 NSFileManager *fileManager = [NSFileManager defaultManager]; //获取document路径 NSString *cachesPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask, YES) objectAtIndex:0]; [fileManager createDirectoryAtPath:[cachesPath stringByAppendingString:@"/Caches"] withIntermediateDirectories:YES attributes:nil error:nil]; //写入路径 NSString *path = [cachesPath stringByAppendingString:[NSString stringWithFormat:@"/%lu.%@",(unsigned long)[urlStr hash],urlStr.pathExtension]]; [data writeToFile:path atomically:YES]; }3、接下来就是进入预览界面 - (void)addPreview { QLPreviewController *qlPC = [[QLPreviewController alloc] init]; qlPC.view.frame = CGRectMake(0, 64, self.view.width, self.view.height - 64); qlPC.dataSource = self; qlPC.delegate = self; [self addChildViewController:qlPC]; [self.view addSubview:qlPC.view]; } 4、遵循 方法 #pragma mark - previewControllerDataSource - (NSInteger)numberOfPreviewItemsInPreviewController:(QLPreviewController *)controller { return 1; } - (id)previewController:(QLPreviewController *)controller previewItemAtIndex:(NSInteger)index { //文件路径，也就是已经下载后的路径 return [NSURL fileURLWithPath:_path]; } 5、预览完文件，可能需要进行分享，以下以微信分享为例 #pragma mark 分享 - (void)share { WXMediaMessage *message = [WXMediaMessage message]; message.title = self.navigationItem.title; WXFileObject *fileObject = [WXFileObject object]; fileObject.fileExtension = _urlStr.pathExtension; fileObject.fileData = [NSData dataWithContentsOfFile:_path]; message.mediaObject = fileObject; SendMessageToWXReq *req = [[SendMessageToWXReq alloc] init]; req.bText = NO; req.message = message; req.scene = 0; [WXApi sendReq:req]; }
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