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iOS文件预览分享小技能示例
来源：jb51　　时间：2022/8/16 15:27:30　　对本文有异议

前言

应用场景：文件下载、打印

I 第三方SDK分享文件

1.1 微信SDK

  1. /**
  2. enum WXScene {
  3.     WXSceneSession  = 0, 
  4.     WXSceneTimeline = 1,
  5.     WXSceneFavorite = 2,
  6. };
  7. 文件真实数据内容
  8.  * @note 大小不能超过10M
  9.  */
  10. @property (nonatomic, retain) NSData    *fileData;
  11. */
  12. - (void)sendFileContent
  13. {
  14.     WXMediaMessage *message = [WXMediaMessage message];
  15.     message.title = @"ML.pdf";
  16.     message.description = @"Pro CoreData";
  17.     [message setThumbImage:[UIImage imageNamed:@"res2.jpg"]];
  18.     WXFileObject *ext = [WXFileObject object];
  19.     ext.fileExtension = @"pdf";
  20.     NSString* filePath = [[NSBundle mainBundle] pathForResource:@"ML" ofType:@"pdf"];
  21.     ext.fileData = [NSData dataWithContentsOfFile:filePath];
  22.     //+ (nullable instancetype)dataWithContentsOfURL:(NSURL *)url;
  23.     message.mediaObject = ext;
  24.     SendMessageToWXReq* req = [[[SendMessageToWXReq alloc] init]autorelease];
  25.     req.bText = NO;
  26.     req.message = message;
  27.     req.scene = WXSceneSession;
  28.     [WXApi sendReq:req completion:nil];
  29. }

1.2 友盟SDK

  1. #pragma mark - UMFileObject
  2. /*! @brief 多媒体消息中包含的文件数据对象
  3.  *
  4.  * @see UMShareObject
  5.  */
  6. @interface UMShareFileObject : UMShareObject
  7. /** 文件后缀名
  8.  * @note 长度不超过64字节
  9.  */
  10. @property (nonatomic, retain) NSString  *fileExtension;
  11. /** 文件真实数据内容
  12.  * @note 大小不能超过10M
  13.  */
  14. @property (nonatomic, retain) NSData    *fileData;
  15. /** 文件的名字(不包含后缀)
  16.  * @note 长度不超过64字节
  17.  */
  18. @property (nonatomic, retain) NSString  *fileName;
  19. @end

II 原生API的文件预览及其他应用打开

  1. - (BOOL)presentOptionsMenuFromRect:(CGRect)rect inView:(UIView *)view animated:(BOOL)animated;
  2. - (BOOL)presentOptionsMenuFromBarButtonItem:(UIBarButtonItem *)item animated:(BOOL)animated;
  3. // Bypasses the menu and opens the full screen preview window for the item at URL.  Returns NO if the item could not be previewed.
  4. // Note that you must implement the delegate method documentInteractionControllerViewControllerForPreview: to preview the document.
  5. - (BOOL)presentPreviewAnimated:(BOOL)animated;//预览文件
  6. // Presents a menu allowing the user to open the document in another application.  The menu
  7. // will contain all applications that can open the item at URL.
  8. // Returns NO if there are no applications that can open the item at URL.
  9. - (BOOL)presentOpenInMenuFromRect:(CGRect)rect inView:(UIView *)view animated:(BOOL)animated;//包括快速预览菜单、打印、复制
  10. - (BOOL)presentOpenInMenuFromBarButtonItem:(UIBarButtonItem *)item animated:(BOOL)animated;//不包括包括快速预览菜单
  • 获取NSURL
  1. //方式1：
  2.     NSString* filePath = [[NSBundle mainBundle] pathForResource:@"ML" ofType:@"pdf"];
  3. NSURL *url = [NSURL fileURLWithPath:filePath];
  4. // 方式2
  5.     //NSURL *url = [[NSBundle mainBundle] URLForResource:@"ML" withExtension:@"pdf"];
  • 实例化UIDocumentInteractionController
  1. UIDocumentInteractionController *documentController = [UIDocumentInteractionController interactionControllerWithURL:url];
  2. documentController.delegate = self;//UIDocumentInteractionControllerDelegate

2.1 预览文件

  1. [documentController presentPreviewAnimated:YES]; // 预览文件

2.2 文件分享

  1.         CGRect rect = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
  2.        [documentController presentOptionsMenuFromRect:rect inView:self.view  animated:YES];//包括快速预览菜单、打印、复制
  3. //        [documentController presentOpenInMenuFromRect:rect inView:self.view animated:YES];//不包括包括快速预览菜单

2.3 控制是否显示copy、 print、saveToCameraRoll

  1. #pragma mark - UIDocumentInteractionControllerDelegate
  2. - (UIViewController *)documentInteractionControllerViewControllerForPreview:(UIDocumentInteractionController *)interactionController{
  3.     return self;
  4. }
  5. //
  6. /**
  7.  print: saveToCameraRoll:  copy:
  8.  */
  9. - (BOOL)documentInteractionController:(UIDocumentInteractionController *)controller canPerformAction:(SEL)action{
  10.     NSLog(@"canPerformAction  %s %@ ", __func__,NSStringFromSelector(action));
  11.     //NSStringFromSelector(_cmd)  //当前选择器的名字
  12. //    return NO;不显示copy print
  13.     return YES;//显示copy print
  14. }
  15. - (BOOL)documentInteractionController:(UIDocumentInteractionController *)controller performAction:(SEL)action{
  16.     NSLog(@"canPerformAction  %s", __func__);
  17.     return YES;//显示copy print
  18. //    return NO;
  19. }

III 案例

3.1 文件下载和预览

  1. - (void)openfile:(CRMfilePreviewCellM*)m{
  2.     //        NSURL *relativeToURL = [NSURL URLWithString:m.url ];//必须先下载，否则无法查看文件内容
  3.     [SVProgressHUD showWithStatus:@"加载中..."];
  4.     NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:m.url]];
  5.         [SVProgressHUD dismiss];
  6.     if(data== nil){
  7.         [SVProgressHUD showInfoWithStatus:@"文件下载失败"];
  8.         return ;
  9.     }
  10.     //            //用单例类 NSFileManager的对象,将文件写入本地
  11.     NSFileManager *fileManage = [NSFileManager defaultManager];
  12.     NSString *tmp = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
  13. //    NSString *tmp = NSTemporaryDirectory();
  14.     NSString *fileName = m.fileName;
  15.     tmp =[tmp stringByAppendingPathComponent:fileName];
  16.     BOOL isSuccess = [fileManage createFileAtPath:tmp contents:data attributes:nil];
  17.     if(isSuccess){
  18.             NSURL *url = [NSURL fileURLWithPath:tmp];
  19.         UIDocumentInteractionController *documentController = [UIDocumentInteractionController interactionControllerWithURL:url];
  20.         //UIDocumentInteractionController delegate must implement documentInteractionControllerViewControllerForPreview: to allow preview
  21.         documentController.delegate = self;//UIDocumentInteractionControllerDelegate
  22.         [documentController presentPreviewAnimated:YES]; // 预览文件
  23.     }
  24. }
  25. #pragma mark - UIDocumentInteractionControllerDelegate
  26. - (UIViewController *)documentInteractionControllerViewControllerForPreview:(UIDocumentInteractionController *)interactionController{
  27.     return self;
  28. }
  29. //
  30. /**
  31.  print: saveToCameraRoll:  copy:
  32.  */
  33. - (BOOL)documentInteractionController:(UIDocumentInteractionController *)controller canPerformAction:(SEL)action{
  34.     NSLog(@"canPerformAction  %s %@ ", __func__,NSStringFromSelector(action));
  35.     //NSStringFromSelector(_cmd)  //当前选择器的名字
  36. //    return NO;不显示copy print
  37.     return YES;//显示copy print
  38. }
  39. - (BOOL)documentInteractionController:(UIDocumentInteractionController *)controller performAction:(SEL)action{
  40.     NSLog(@"canPerformAction  %s", __func__);
  41.     return YES;//显示copy print
  42. //    return NO;
  43. }

3.2 使用数据模型保存下载文件路径

懒加载

  1.     //        NSURL *relativeToURL = [NSURL URLWithString:m.url ];//必须先下载，否则无法查看文件内容
  2. - (NSString *)filePathFromUrl{
  3.     if(_filePathFromUrl !=nil){
  4.         return _filePathFromUrl;
  5.     }
  6.     NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:self.url]];
  7.     if(data== nil){
  8.         [SVProgressHUD showInfoWithStatus:@"文件下载失败"];
  9.         return nil;
  10.     }
  11.     //            //用单例类 NSFileManager的对象,将文件写入本地
  12.     NSFileManager *fileManage = [NSFileManager defaultManager];
  13.     NSString *tmp = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
  14. //    NSString *tmp = NSTemporaryDirectory();
  15.     NSString *fileName = self.fileName;
  16.     tmp =[tmp stringByAppendingPathComponent:fileName];
  17.     BOOL isSuccess = [fileManage createFileAtPath:tmp contents:data attributes:nil];
  18.     _filePathFromUrl = tmp;
  19.     if(!isSuccess){
  20.         _filePathFromUrl = nil;
  21.     }
  22.     return _filePathFromUrl;
  23. }

预览文件

  1. - (void)openfile:(CRMfilePreviewCellM*)m{
  2.     if(!m.filePathFromUrl){
  3.         return;
  4.     }
  5.             NSURL *url = [NSURL fileURLWithPath:m.filePathFromUrl];
  6.         UIDocumentInteractionController *documentController = [UIDocumentInteractionController interactionControllerWithURL:url];
  7.         //UIDocumentInteractionController delegate must implement documentInteractionControllerViewControllerForPreview: to allow preview
  8.         documentController.delegate = self;//UIDocumentInteractionControllerDelegate
  9.         [documentController presentPreviewAnimated:YES]; // 预览文件
  10. }

3.3 使用数据模型分享文件

  1. @property (nonatomic,copy) NSString *fileName;
  2. @property (nonatomic,copy) NSString *url;
  3. //
  4. @property (nonatomic,copy) NSString *filePathFromUrl;
  5. /**
  6. /** 文件真实数据内容
  7.  * @note微信文件分享 大小不能超过10M
  8.  */
  9. @property (nonatomic, retain) NSData    *fileData;
  10. - (void)sendFileContent;
  11. - (NSData *)fileData{
  12.     if(_fileData==nil){
  13.         NSString* filePath= [self filePathFromUrl];
  14.         _fileData =[NSData dataWithContentsOfFile:filePath];
  15.     }
  16.     return _fileData;
  17. }
  18. - (void)sendFileContent
  19. {
  20.     WXMediaMessage *message = [WXMediaMessage message];
  21.     message.title = self.fileName;
  22.     message.description =self.fileName;
  23.     [message setThumbImage:[UIImage imageNamed:self.iconName]];
  24.     WXFileObject *ext = [WXFileObject object];
  25.     ext.fileExtension =self.fileExtension;
  26.     ext.fileData =self.fileData;
  27.     //+ (nullable instancetype)dataWithContentsOfURL:(NSURL *)url;
  28.     message.mediaObject = ext;
  29.     SendMessageToWXReq* req = [[SendMessageToWXReq alloc] init];
  30.     req.bText = NO;
  31.     req.message = message;
  32.     req.scene = WXSceneSession;
  33.     [WXApi sendReq:req completion:nil];
  34. }

3.4 清理缓存

获取沙盒缓存路径

  1. + (nullable NSString *)userCacheDirectory {
  2.     NSArray<NSString *> *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
  3.     return paths.firstObject;
  4. }

清理沙河文件缓存

  1. - (void)removeAllData {
  2.     [self.fileManager removeItemAtPath:self.diskCachePath error:nil];
  3.     [self.fileManager createDirectoryAtPath:self.diskCachePath
  4.             withIntermediateDirectories:YES
  5.                              attributes:nil
  6.                                   error:NULL];
  7. }

清理WKWebView的缓存

  1. + (void)clearWebCacheCompletion:(dispatch_block_t)completion {
  2.     if (@available(iOS 9.0, *)) {
  3.         NSSet *websiteDataTypes = [WKWebsiteDataStore allWebsiteDataTypes];
  4.         NSDate *dateFrom = [NSDate dateWithTimeIntervalSince1970:0];
  5.         [[WKWebsiteDataStore defaultDataStore] removeDataOfTypes:websiteDataTypes modifiedSince:dateFrom completionHandler:completion];
  6.     } else {
  7.         NSString *libraryDir = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES)[0];
  8.         NSString *bundleId  =  [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleIdentifier"];
  9.         NSString *webkitFolderInLib = [NSString stringWithFormat:@"%@/WebKit",libraryDir];
  10.         NSString *webKitFolderInCaches = [NSString stringWithFormat:@"%@/Caches/%@/WebKit",libraryDir,bundleId];
  11.         NSString *webKitFolderInCachesfs = [NSString stringWithFormat:@"%@/Caches/%@/fsCachedData",libraryDir,bundleId];
  12.         NSError *error;
  13.         /* iOS8.0 WebView Cache path */
  14.         [[NSFileManager defaultManager] removeItemAtPath:webKitFolderInCaches error:&error];
  15.         [[NSFileManager defaultManager] removeItemAtPath:webkitFolderInLib error:nil];
  16.         /* iOS7.0 WebView Cache path */
  17.         [[NSFileManager defaultManager] removeItemAtPath:webKitFolderInCachesfs error:&error];
  18.         if (completion) {
  19.             completion();
  20.         }
  21.     }
  22. }

清理图片缓存

  1. +(void)clearCache:(NSString *)path{
  2.     NSFileManager *fileManager=[NSFileManager defaultManager];
  3.     if ([fileManager fileExistsAtPath:path]) {
  4.         NSArray *childerFiles=[fileManager subpathsAtPath:path];
  5.         for (NSString *fileName in childerFiles) {
  6.             //如有需要，加入条件，过滤掉不想删除的文件
  7.             NSString *absolutePath=[path stringByAppendingPathComponent:fileName];
  8.             [fileManager removeItemAtPath:absolutePath error:nil];
  9.         }
  10.     }
  11.     //    [[SDImageCache sharedImageCache] cleanDisk];
  12.     [[SDImageCache sharedImageCache] clearDiskOnCompletion:^{
  13.     }];
  14. }

以上就是iOS文件预览分享小技能示例的详细内容，更多关于iOS文件预览分享的资料请关注w3xue其它相关文章！

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