Passing Data from Detail View to Master View (Splitviewcontroller) - ios

Question

i'm really new to iOS programming and i have a problem with the Splitviewcontroller.
I'm programming an iPad App, that load a picture from the gallery and then save the EXIF Data into a Table View. Loading the picture is no problem, but when i'm trying to save the EXIF Data into the Table View, nothing happen. I have the same App for the iPhone but not with the Splitview and there everything works.
I searched for days now for an answer, but nothing was really helpful for my problem.
Here is some code:
ViewController.m
#import "ViewController-iPad.h"
#import "TableController-iPad.h"
#implementation ViewController_iPad
{
UIPopoverController *masterPopoverController;
}
#synthesize exifPtr;
#synthesize toolbar;
#synthesize imageView;
#synthesize detailItem = _detailItem;
-(void) setDetailItem:(id)newDetailItem
{
if (_detailItem != newDetailItem)
{
_detailItem = newDetailItem;
}
if (masterPopoverController != nil)
{
[masterPopoverController dismissPopoverAnimated: YES];
}
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
{
UIAlertView *myAlertView = [[UIAlertView alloc] initWithTitle:#"Error"
message:#"Device has no camera"
delegate:nil
cancelButtonTitle:#"OK"
otherButtonTitles: nil];
[myAlertView show];
}
}
- (void)viewDidUnload
{
[self setToolbar:nil];
[super viewDidUnload];
// Release any retained subviews of the main view.
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return YES;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
}
- (IBAction)selectPhoto:(UIButton *)sender
{
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
picker.allowsEditing = YES;
picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
[self presentViewController:picker animated:YES completion:NULL];
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if([segue.identifier isEqualToString:#"exifCell"])
{
TableController_iPad *controller = (TableController_iPad *)segue.destinationViewController;
controller.exifPtr = exifPtr;
}
}
+ (ALAssetsLibrary *)defaultAssetsLibrary
{
static dispatch_once_t pred = 0;
static ALAssetsLibrary *library = nil;
dispatch_once(&pred, ^{
library = [[ALAssetsLibrary alloc] init];
});
return library;
}
#pragma mark - Image Picker Controller delegate methods
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
UIImage *chosenImage = info[UIImagePickerControllerEditedImage];
self.imageView.image = chosenImage;
NSURL *url = info[UIImagePickerControllerReferenceURL];
ALAssetsLibrary *lib = [ViewController_iPad defaultAssetsLibrary];
[lib assetForURL:url resultBlock:^(ALAsset *asset)
{
// get data
ALAssetRepresentation *repr = [asset defaultRepresentation];
long long bytes = [repr size];
unsigned char *dataPtr = malloc((unsigned long)bytes);
[repr getBytes:dataPtr fromOffset:0 length:(NSUInteger)bytes error:NULL];
JPEG_GetEXIFFromMemory(dataPtr, (long)bytes, &exifPtr);
PrvConvertEXIFToText(exifPtr);
free(dataPtr);
} failureBlock:^(NSError *error)
{
;
}];
[picker dismissViewControllerAnimated:YES completion:NULL];
}
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
[picker dismissViewControllerAnimated:YES completion:NULL];
}
// Standard-Methoden für einen SplitViewController
-(void) splitViewController:(UISplitViewController *)svc willHideViewController:(UIViewController *)aViewController withBarButtonItem:(UIBarButtonItem *)barButtonItem forPopoverController:(UIPopoverController *)pc
{
barButtonItem.title = #"EXIF";
self.navigationItem.rightBarButtonItem = barButtonItem;
NSMutableArray *items = [[self.toolbar items] mutableCopy];
[items insertObject: barButtonItem atIndex: 0];
[self.toolbar setItems:items animated:YES];
masterPopoverController = pc;
}
-(void) splitViewController:(UISplitViewController *)svc willShowViewController:(UIViewController *)aViewController invalidatingBarButtonItem:(UIBarButtonItem *)barButtonItem
{
NSMutableArray *items = [[self.toolbar items] mutableCopy];
[items removeObject:barButtonItem];
[self.toolbar setItems:items animated:YES];
masterPopoverController = nil;
}
#end
TableController.m
#import "TableController-iPad.h"
#interface TableController_iPad()
#property (nonatomic, strong) NSArray *exifTitleArray;
#property (nonatomic, strong) NSArray *exifContentArray;
#end
#implementation TableController_iPad
#synthesize exifTitle;
#synthesize exifContent;
#synthesize exifPtr;
- (id)initWithStyle:(UITableViewStyle)style
{
self = [super initWithStyle:style];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
cellTitle = [NSArray arrayWithObjects: exifTitle, nil];
cellContent = [NSArray arrayWithObjects: exifContent, nil];
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return YES;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView;
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
if(exifPtr==0)
{
return 0;
}
return exifPtr->textCount;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
//NSString *simpleTableIdentifier = [NSString stringWithFormat:#"exifCell %ld", (long)indexPath.row];
static NSString *simpleTableIdentifier = #"exifCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
if (cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue2 reuseIdentifier:simpleTableIdentifier];
}
// Configure the cell...
char * exifDataTitle = exifPtr->exifTextRec[indexPath.row].description;
NSString * exifCStringTitle = [NSString stringWithCString: exifDataTitle encoding:NSUTF8StringEncoding];
char * exifDataContent = exifPtr->exifTextRec[indexPath.row].content;
NSString * exifCStringContent = [NSString stringWithCString: exifDataContent encoding:NSUTF8StringEncoding];
cell.textLabel.font = [UIFont systemFontOfSize:10.0];
cell.textLabel.text = exifCStringTitle;
cell.detailTextLabel.font = [UIFont systemFontOfSize:10.0];
cell.detailTextLabel.text = exifCStringContent;
return cell;
}
#end
PS: Sorry for some grammar mistakes, english is not my best language ;)

Answer 1

You can use custom delegate to get data from child view controller to parent view controller.
This link is may help you to achieve this.