部分手机出现无法拷贝视频的问题，报错：

AVAssetExportSessionStatusFailed: Error Domain=NSURLErrorDomain Code=-3000 "无法创建文件" UserInfo={NSLocalizedDescription=无法创建文件, NSUnderlyingError=0x148fef810 {Error Domain=NSOSStatusErrorDomain Code=-12124 "(null)"}}

TZImagePickerController/TZImagePickerController/TZImageManager.m

@@ -567,6 +567,10 @@ static CGFloat TZScreenScale;
             session.outputFileType = [supportedTypeArray objectAtIndex:0];
         }
         
+        if (![[NSFileManager defaultManager] fileExistsAtPath:[NSHomeDirectory() stringByAppendingFormat:@"/tmp"]]) {
+            [[NSFileManager defaultManager] createDirectoryAtPath:[NSHomeDirectory() stringByAppendingFormat:@"/tmp"] withIntermediateDirectories:YES attributes:nil error:nil];
+        }
+
         // Begin to export video to the output path asynchronously.
         [session exportAsynchronouslyWithCompletionHandler:^(void) {
             switch (session.status) {