优化视频导出方法，当发生错误时调用失败回调透出错误信息

TZImagePickerController/TZImagePickerController/TZImageManager.h

@@ -81,7 +81,9 @@
 - (void)getVideoWithAsset:(id)asset progressHandler:(void (^)(double progress, NSError *error, BOOL *stop, NSDictionary *info))progressHandler completion:(void (^)(AVPlayerItem *, NSDictionary *))completion;
 
 /// Export video 导出视频
-- (void)getVideoOutputPathWithAsset:(id)asset completion:(void (^)(NSString *outputPath))completion;
+- (void)getVideoOutputPathWithAsset:(id)asset success:(void (^)(NSString *outputPath))success failure:(void (^)(NSString *errorMessage, NSError *error))failure;
+/// Deprecated, Use -getVideoOutputPathWithAsset:failure:success:
+- (void)getVideoOutputPathWithAsset:(id)asset completion:(void (^)(NSString *outputPath))completion __attribute__((deprecated("Use -getVideoOutputPathWithAsset:failure:success:")));
 
 /// Get photo bytes 获得一组照片的大小
 - (void)getPhotosBytesWithArray:(NSArray *)photos completion:(void (^)(NSString *totalBytes))completion;

TZImagePickerController/TZImagePickerController/TZImageManager.m

@@ -714,7 +714,7 @@ static dispatch_once_t onceToken;
 #pragma mark - Export video
 
 /// Export Video / 导出视频
-- (void)getVideoOutputPathWithAsset:(id)asset completion:(void (^)(NSString *outputPath))completion {
+- (void)getVideoOutputPathWithAsset:(id)asset success:(void (^)(NSString *outputPath))success failure:(void (^)(NSString *errorMessage, NSError *error))failure {
     if ([asset isKindOfClass:[PHAsset class]]) {
         PHVideoRequestOptions* options = [[PHVideoRequestOptions alloc] init];
         options.version = PHVideoRequestOptionsVersionOriginal;
@@ -724,16 +724,21 @@ static dispatch_once_t onceToken;
             // NSLog(@"Info:\n%@",info);
             AVURLAsset *videoAsset = (AVURLAsset*)avasset;
             // NSLog(@"AVAsset URL: %@",myAsset.URL);
-            [self startExportVideoWithVideoAsset:videoAsset completion:completion];
+            [self startExportVideoWithVideoAsset:videoAsset success:success failure:failure];
         }];
     } else if ([asset isKindOfClass:[ALAsset class]]) {
         NSURL *videoURL =[asset valueForProperty:ALAssetPropertyAssetURL]; // ALAssetPropertyURLs
         AVURLAsset *videoAsset = [[AVURLAsset alloc] initWithURL:videoURL options:nil];
-        [self startExportVideoWithVideoAsset:videoAsset completion:completion];
+        [self startExportVideoWithVideoAsset:videoAsset success:success failure:failure];
     }
 }
 
-- (void)startExportVideoWithVideoAsset:(AVURLAsset *)videoAsset completion:(void (^)(NSString *outputPath))completion {
+/// Deprecated, Use -getVideoOutputPathWithAsset:failure:success:
+- (void)getVideoOutputPathWithAsset:(id)asset completion:(void (^)(NSString *outputPath))completion {
+    [self getVideoOutputPathWithAsset:asset success:completion failure:nil];
+}
+
+- (void)startExportVideoWithVideoAsset:(AVURLAsset *)videoAsset success:(void (^)(NSString *outputPath))success failure:(void (^)(NSString *errorMessage, NSError *error))failure {
     // Find compatible presets by video asset.
     NSArray *presets = [AVAssetExportSession exportPresetsCompatibleWithAsset:videoAsset];
     
@@ -747,7 +752,7 @@ static dispatch_once_t onceToken;
         NSDateFormatter *formater = [[NSDateFormatter alloc] init];
         [formater setDateFormat:@"yyyy-MM-dd-HH:mm:ss-SSS"];
         NSString *outputPath = [NSHomeDirectory() stringByAppendingFormat:@"/tmp/output-%@.mp4", [formater stringFromDate:[NSDate date]]];
-        NSLog(@"video outputPath = %@",outputPath);
+        // NSLog(@"video outputPath = %@",outputPath);
         session.outputURL = [NSURL fileURLWithPath:outputPath];
         
         // Optimize for network use.
@@ -757,6 +762,9 @@ static dispatch_once_t onceToken;
         if ([supportedTypeArray containsObject:AVFileTypeMPEG4]) {
             session.outputFileType = AVFileTypeMPEG4;
         } else if (supportedTypeArray.count == 0) {
+            if (failure) {
+                failure(@"该视频类型暂不支持导出", nil);
+            }
             NSLog(@"No supported file types 视频类型暂不支持导出");
             return;
         } else {
@@ -775,25 +783,38 @@ static dispatch_once_t onceToken;
         
         // Begin to export video to the output path asynchronously.
         [session exportAsynchronouslyWithCompletionHandler:^(void) {
-            switch (session.status) {
-                case AVAssetExportSessionStatusUnknown:
-                    NSLog(@"AVAssetExportSessionStatusUnknown"); break;
-                case AVAssetExportSessionStatusWaiting:
-                    NSLog(@"AVAssetExportSessionStatusWaiting"); break;
-                case AVAssetExportSessionStatusExporting:
-                    NSLog(@"AVAssetExportSessionStatusExporting"); break;
-                case AVAssetExportSessionStatusCompleted: {
-                    NSLog(@"AVAssetExportSessionStatusCompleted");
-                    dispatch_async(dispatch_get_main_queue(), ^{
-                        if (completion) {
-                            completion(outputPath);
+            dispatch_async(dispatch_get_main_queue(), ^{
+                switch (session.status) {
+                    case AVAssetExportSessionStatusUnknown: {
+                        NSLog(@"AVAssetExportSessionStatusUnknown");
+                    }  break;
+                    case AVAssetExportSessionStatusWaiting: {
+                        NSLog(@"AVAssetExportSessionStatusWaiting");
+                    }  break;
+                    case AVAssetExportSessionStatusExporting: {
+                        NSLog(@"AVAssetExportSessionStatusExporting");
+                    }  break;
+                    case AVAssetExportSessionStatusCompleted: {
+                        NSLog(@"AVAssetExportSessionStatusCompleted");
+                        if (success) {
+                            success(outputPath);
                         }
-                    });
-                }  break;
-                case AVAssetExportSessionStatusFailed:
-                    NSLog(@"AVAssetExportSessionStatusFailed"); break;
-                default: break;
-            }
+                    }  break;
+                    case AVAssetExportSessionStatusFailed: {
+                        NSLog(@"AVAssetExportSessionStatusFailed");
+                        if (failure) {
+                            failure(@"视频导出失败", session.error);
+                        }
+                    }  break;
+                    case AVAssetExportSessionStatusCancelled: {
+                        NSLog(@"AVAssetExportSessionStatusCancelled");
+                        if (failure) {
+                            failure(@"导出任务已被取消", nil);
+                        }
+                    }  break;
+                    default: break;
+                }
+            });
         }];
     }
 }

TZImagePickerController/ViewController.m

@@ -496,12 +496,13 @@
     _selectedPhotos = [NSMutableArray arrayWithArray:@[coverImage]];
     _selectedAssets = [NSMutableArray arrayWithArray:@[asset]];
     // open this code to send video / 打开这段代码发送视频
-    // [[TZImageManager manager] getVideoOutputPathWithAsset:asset completion:^(NSString *outputPath) {
-    // NSLog(@"视频导出到本地完成,沙盒路径为:%@",outputPath);
-    // Export completed, send video here, send by outputPath or NSData
-    // 导出完成，在这里写上传代码，通过路径或者通过NSData上传
-    
-    // }];
+    [[TZImageManager manager] getVideoOutputPathWithAsset:asset success:^(NSString *outputPath) {
+        NSLog(@"视频导出到本地完成,沙盒路径为:%@",outputPath);
+        // Export completed, send video here, send by outputPath or NSData
+        // 导出完成，在这里写上传代码，通过路径或者通过NSData上传
+    } failure:^(NSString *errorMessage, NSError *error) {
+        NSLog(@"视频导出失败:%@,error:%@",errorMessage, error);
+    }];
     [_collectionView reloadData];
     // _collectionView.contentSize = CGSizeMake(0, ((_selectedPhotos.count + 2) / 3 ) * (_margin + _itemWH));
 }