public void LoadImage(string[] keys, Action updateBlock = null)
{
// Fetches the imageRecord this post record references in its ImageRefKey.
// Only fetches the values associated with the keys passed in to the NSArray
var imgRecordId = ((CKReference)PostRecord[ImageRefKey]).RecordId;
CKFetchRecordsOperation imageOp = new CKFetchRecordsOperation(new CKRecordID[] {
imgRecordId
});
imageOp.DesiredKeys = keys;
imageOp.Completed = (NSDictionary recordDict, NSError error) => {
if (error != null && error.Code == (long)CKErrorCode.PartialFailure)
{
CKErrorInfo info = new CKErrorInfo(error);
error = info[imgRecordId];
}
Error errorResponse = HandleError(error);
switch (errorResponse)
{
case Error.Success:
CKRecord fetchedImageRecord = (CKRecord)recordDict[imgRecordId];
ImageRecord = new Image(fetchedImageRecord);
if (updateBlock != null)
{
updateBlock();
}
break;
case Error.Retry:
Utils.Retry(() => LoadImage(keys, updateBlock), error);
ImageRecord = null;
break;
case Error.Ignore:
Console.WriteLine("Error: {0}", error.Description);
ImageRecord = null;
break;
default:
throw new NotImplementedException();
}
};
PublicDB.AddOperation(imageOp);
}
void PublishPost(NSObject sender)
{
// Prevents multiple posting, locks as soon as a post is made
PostButton.Enabled = false;
UIActivityIndicatorView indicator = new UIActivityIndicatorView(UIActivityIndicatorViewStyle.Gray);
indicator.StartAnimating();
PostButton.CustomView = indicator;
// Hides the keyboards and dispatches a UI update to show the upload progress
HiddenText.EndEditing(true);
TagField.EndEditing(true);
ProgressBar.Hidden = false;
// Creates post record type and initizalizes all of its values
CKRecord newRecord = new CKRecord(Post.RecordType);
newRecord [Post.FontKey] = (NSString)ImageLabel.Font.Name;
newRecord [Post.ImageRefKey] = new CKReference(ImageRecord.Record.Id, CKReferenceAction.DeleteSelf);
newRecord [Post.TextKey] = (NSString)HiddenText.Text;
string[] tags = TagField.Text.ToLower().Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
newRecord [Post.TagsKey] = NSArray.FromObjects(tags);
Post newPost = new Post(newRecord);
newPost.ImageRecord = ImageRecord;
// Only upload image record if it is not on server, otherwise just upload the new post record
CKRecord[] recordsToSave = ImageRecord.IsOnServer
? new CKRecord[] { newRecord }
: new CKRecord[] { newRecord, ImageRecord.Record };
// TODO: https://trello.com/c/A9T8Spyp second param is null
CKModifyRecordsOperation saveOp = new CKModifyRecordsOperation(recordsToSave, new CKRecordID[0]);
saveOp.PerRecordProgress = (CKRecord record, double progress) => {
// Image record type is probably going to take the longest to upload. Reflect it's progress in the progress bar
if (record.RecordType == Image.RecordType)
{
InvokeOnMainThread(() => {
var val = (float)(progress * 0.95);
ProgressBar.SetProgress(val, true);
});
}
};
// When completed it notifies the tableView to add the post we just uploaded, displays error if it didn't work
saveOp.Completed = (CKRecord[] savedRecords, CKRecordID[] deletedRecordIDs, NSError operationError) => {
Error errorResponse = HandleError(operationError);
switch (errorResponse)
{
case Error.Success:
// Tells delegate to update so it can display our new post
InvokeOnMainThread(() => {
DismissViewController(true, null);
MainController.Submit(newPost);
});
break;
case Error.Retry:
CKErrorInfo errorInfo = new CKErrorInfo(operationError.UserInfo);
nint retryAfter = errorInfo.RetryAfter.HasValue ? errorInfo.RetryAfter.Value : 3;
Console.WriteLine("Error: {0}. Recoverable, retry after {1} seconds", operationError.Description, retryAfter);
Task.Delay((int)retryAfter * 1000).ContinueWith(_ => PublishPost(sender));
break;
case Error.Ignore:
Console.WriteLine("Error saving record: {0}", operationError.Description);
string errorTitle = "Error";
string dismissButton = "Okay";
string errorMessage = operationError.Code == (long)CKErrorCode.NotAuthenticated
? "You must be logged in to iCloud in order to post"
: "Unrecoverable error with the upload, check console logs";
InvokeOnMainThread(() => {
UIAlertController alert = UIAlertController.Create(errorTitle, errorMessage, UIAlertControllerStyle.Alert);
alert.AddAction(UIAlertAction.Create(dismissButton, UIAlertActionStyle.Cancel, null));
PostButton.Enabled = true;
PresentViewController(alert, true, null);
ProgressBar.Hidden = true;
PostButton.CustomView = null;
});
break;
default:
throw new NotImplementedException();
}
};
CKContainer.DefaultContainer.PublicCloudDatabase.AddOperation(saveOp);
}
// This method fetches the whole ImageRecord that a user taps on and then passes it to the delegate
public override void ItemSelected(UICollectionView collectionView, NSIndexPath indexPath)
{
// If the user has already tapped on a thumbnail, prevent them from tapping any others
if (controller.lockSelectThumbnail)
{
return;
}
else
{
controller.lockSelectThumbnail = true;
}
// Starts animating the thumbnail to indicate it is loading
controller.ImageCollection.SetLoadingFlag(indexPath, true);
// Uses convenience API to fetch the whole image record associated with the thumbnail that was tapped
CKRecordID userSelectedRecordID = controller.ImageCollection.GetRecordId(indexPath);
controller.PublicCloudDatabase.FetchRecord(userSelectedRecordID, (record, error) => {
// If we get a partial failure, we should unwrap it
if (error != null && error.Code == (long)CKErrorCode.PartialFailure)
{
CKErrorInfo info = new CKErrorInfo(error);
error = info[userSelectedRecordID];
}
Error errorResponse = controller.HandleError(error);
switch (errorResponse)
{
case Error.Success:
controller.ImageCollection.SetLoadingFlag(indexPath, false);
Image selectedImage = new Image(record);
InvokeOnMainThread(() => {
controller.MasterController.GoTo(controller, selectedImage);
});
break;
case Error.Retry:
Utils.Retry(() => {
controller.lockSelectThumbnail = false;
ItemSelected(collectionView, indexPath);
}, error);
break;
case Error.Ignore:
Console.WriteLine("Error: {0}", error.Description);
string errorTitle = "Error";
string errorMessage = "We couldn't fetch the full size thumbnail you tried to select, try again";
string dismissButton = "Okay";
UIAlertController alert = UIAlertController.Create(errorTitle, errorMessage, UIAlertControllerStyle.Alert);
alert.AddAction(UIAlertAction.Create(dismissButton, UIAlertActionStyle.Cancel, null));
InvokeOnMainThread(() => controller.PresentViewController(alert, true, null));
controller.ImageCollection.SetLoadingFlag(indexPath, false);
controller.lockSelectThumbnail = false;
break;
default:
throw new NotImplementedException();
}
});
}
static int FetchRetryDelay(NSError error)
{
CKErrorInfo errorInfo = new CKErrorInfo(error.UserInfo);
return((int)(errorInfo.RetryAfter.HasValue ? errorInfo.RetryAfter.Value : 3));
}
