I am using this code to recall the directory that I have made for each genre. However I get errors saying at the images part at the [arrayCollectionImages addObject:image]; Can you explain what is wrong with the last piece of code. I also have an warning at arrayCollectionImages saying local declaration of arrayColectionImages hide instance variable. It is also telling me that the [[cell collectionImageView]setImage:[UIImage imageNamed:[arrayCollectionImages objectAtindex:indexPath.item]]]; No visible #interface for "NSArray" declares the selector "objectAtindex:;" What did I have done wrong?
#import "CollectionViewController.h"
#import "CollectionCell.h"
#interface CollectionViewController (){
NSArray *arrayCollectionImages;
}
#end
#implementation CollectionViewController
- (void)viewDidLoad {
NSArray *allImagesArray = [[NSArray alloc ]init];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *location=#"Genre1";
NSString *fPath = [documentsDirectory stringByAppendingPathComponent:location];
NSArray *directoryContent = [[NSFileManager defaultManager] directoryContentsAtPath: fPath];
for(NSString *str in directoryContent){
NSString *finalFilePath = [fPath stringByAppendingPathComponent:str];
NSData *data = [NSData dataWithContentsOfFile:finalFilePath];
if(data)
{
UIImage *image = [UIImage imageWithData:data];
[allImagesArray addObject:image];
}
}
[super viewDidLoad];
}
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
CollectionCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:#"ReuseID" forIndexPath:indexPath];
[[cell collectionImageView]setImage:[UIImage imageNamed:[arrayCollectionImages objectAtIndex:indexPath.item]]];
return cell;
}
-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{
return [arrayCollectionImages count];
}
#end
This is my code for saving to directory
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
FrontCamera = NO;
cameraSwitch.selectedSegmentIndex = 1;
captureImage.hidden = YES;
[pickerViewContainer addSubview:SaveTopicker];
arraygenre = [[NSMutableArray alloc] init];
[arraygenre addObject:#"Tops"];
[arraygenre addObject:#"Pants"];
[arraygenre addObject:#"Coats"];
[arraygenre addObject:#"Shoes"];
[arraygenre addObject:#"Hats"];
[arraygenre addObject:#"Others"];
pickerViewContainer.frame = CGRectMake(0, 800, 320, 261);
}
- (void)viewDidAppear:(BOOL)animated {
[self initializeCamera];
}
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
//fetch Category Name from the array used to fill the Picker View
NSString *categoryName= [arraygenre objectAtIndex:row];
NSString *fPath = [documentsDirectory stringByAppendingPathComponent:categoryName];
NSFileManager *fileManager=[[NSFileManager alloc]init];
[fileManager createDirectoryAtPath:fPath withIntermediateDirectories:YES attributes:nil error:nil];
UIImage *image = captureImage.image;
NSData *data = UIImagePNGRepresentation(image);
[data writeToFile:fPath atomically:YES];
}
The method name is objectAtIndex:. You have the "i" in the method name in lower case which is incorrect.
Related
I am developing an app that will display data from server in a parallax type UITableView, and here is my code. Everything is loading great, but cell data(image, etc) keep switching from one cell to another.
- (void)viewDidLoad
{
[self hasInternet];
self.tableView.dataSource = self;
self.tableView.delegate = self;
[self loadData];
self.edgesForExtendedLayout=UIRectEdgeNone;
self.extendedLayoutIncludesOpaqueBars=NO;
self.automaticallyAdjustsScrollViewInsets=NO;
[super viewDidLoad];
}
- (void)viewWillAppear:(BOOL)animated
{
[self scrollViewDidScroll:nil];
[super viewWillAppear:animated];
[self loadData];
self.tableView.dataSource = self;
self.tableView.delegate = self;
}
- (void) loadData{
name = #"name";
email = #"email";
thumbnail = #"thumbnail";
myObject = [[NSMutableArray alloc] init];
NSData *jsonSource = [NSData dataWithContentsOfURL:[NSURL URLWithString:#"http://URL.php"]];
id jsonObjects = [NSJSONSerialization JSONObjectWithData:jsonSource options:NSJSONReadingMutableContainers error:nil];
for (NSDictionary *dataDict in jsonObjects) {
NSString *title_data = [dataDict objectForKey:#"fname"];
NSString *title_data2 = [dataDict objectForKey:#"lname"];
NSString *fulname = [NSString stringWithFormat:#"%# %#", title_data, title_data2];
NSString *emAil = [dataDict objectForKey:#"email"];
NSString *thumbnail_data = [dataDict objectForKey:#"img"];
thumbnail_data = [NSString stringWithFormat:#"http://URL/upload/%#",thumbnail_data];
dictionary = [NSDictionary dictionaryWithObjectsAndKeys: fulname, name, emAil, email, thumbnail_data, thumbnail, nil];
[myObject addObject:dictionary];
}
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return myObject.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"parallaxCell";
JBParallaxCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell=[[JBParallaxCell alloc]initWithStyle:
UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
}
NSDictionary *tmpDict = [myObject objectAtIndex:indexPath.row];
NSMutableString *text;
text = [NSMutableString stringWithFormat:#"%#",[tmpDict objectForKeyedSubscript:name]];
NSMutableString *mail;
mail = [NSMutableString stringWithFormat:#"%#",[tmpDict objectForKeyedSubscript:email]];
NSMutableString *images;
images = [NSMutableString stringWithFormat:#"%# ",[tmpDict objectForKey:thumbnail]];
NSURL *url = [NSURL URLWithString:[tmpDict objectForKey:thumbnail]];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSURL *url = [NSURL URLWithString:[tmpDict objectForKey:thumbnail]];
NSData *data = [NSData dataWithContentsOfURL:url];
dispatch_async(dispatch_get_main_queue(), ^{
cell.parallaxImage.image = [[UIImage alloc]initWithData:data];
});
});
cell.titleLabel.text = [NSString stringWithFormat:#"%#",text];
cell.subtitleLabel.text = [NSString stringWithFormat:#"%#",mail];
return cell;
}
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
NSArray *visibleCells = [self.tableView visibleCells];
for (JBParallaxCell *cell in visibleCells) {
[cell cellOnTableView:self.tableView didScrollOnView:self.view];
}
}
When I compile it, it shows all my data but then keep switching from one cell to another. Any help will be appreciated. Thanks
Because UITableView reuse the cell so when you scroll down or up the previous cell which is gone from your tableview bound is reuse. but it's image view has an image when it use last time so you have to clear first the imageview.
so put this line
cell.parallaxImage.image = nil;
Before the dispatch queue
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
You can use this code it will save the images in document directry and then show it.
please change the variable name.
NSString *imageURL = [[matcheListArr objectAtIndex:indexPath.row] valueForKey:#"thumbnail_image"];
NSURL *url = [NSURL URLWithString:imageURL];
NSArray *seperate = [[[matcheListArr objectAtIndex:indexPath.row] valueForKey:#"thumbnail_image"] componentsSeparatedByString:#"/"];
NSString *fileName = [NSString stringWithFormat:#"%#.png",[seperate objectAtIndex:seperate.count-1]];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0]; // Get documents folder
NSString *dataPath = [documentsDirectory stringByAppendingPathComponent:#"/MyFolder"];
NSError *error;
if (![[NSFileManager defaultManager] fileExistsAtPath:dataPath])
[[NSFileManager defaultManager] createDirectoryAtPath:dataPath withIntermediateDirectories:NO attributes:nil error:&error];
NSString *getImagePath = [dataPath stringByAppendingPathComponent:[NSString stringWithFormat:#"%#",fileName]];
UIImage *img = [UIImage imageWithContentsOfFile:getImagePath];
if ([img isKindOfClass:[UIImage class]]) {
//Set Downloaded Image
[cell.matchUserImageView setImage:img];
}
else {
if ([[ValidationString sharedManager] isNullString:[[matcheListArr objectAtIndex:indexPath.row] valueForKey:#"thumbnail_image"]] == YES) {
//Set Default Image
[cell.matchUserImageView setImage:[UIImage imageNamed:#"photo_icon.png"]];
}
else{
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0), ^{
NSData *imageData = [NSData dataWithContentsOfURL:url];
NSArray *seperate = [[[matcheListArr objectAtIndex:indexPath.row] valueForKey:#"thumbnail_image"] componentsSeparatedByString:#"/"];
NSString *fileName = [NSString stringWithFormat:#"%#.png",[seperate objectAtIndex:seperate.count-1]];
dispatch_async(dispatch_get_main_queue(), ^{
// Update the UI
[cell.matchUserImageView setImage:[UIImage imageWithData:imageData]];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *dataPath = [documentsDirectory stringByAppendingPathComponent:#"/MyFolder"];
NSString *savedImagePath = [dataPath stringByAppendingPathComponent:[NSString stringWithFormat:#"%#",fileName]];
[imageData writeToFile:savedImagePath atomically:NO];
});
});
}
}
How can I get images from documents directory to poplulate a collection view. So far I get all the images dumped into each cell according to my log, (or at least the image name is printed in the log)
First im getting the image names from the documents directory filelist is an NSMutable array of imageNames.png
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsPath = [paths objectAtIndex:0];
NSArray *dirContents = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:documentsPath error:nil];
fileList=[[NSMutableArray alloc]init];
for (NSString *filename in dirContents) {
NSString *fileExt = [filename pathExtension];
if ([fileExt isEqualToString:#"png"]) {
[fileList addObject:filename];
}
}
NSLog(#"document folder content list %# ",fileList);
This returns a list of my png file names in my NSMutsableArray fileList. Then I want to get all these images into my collection view
//set up cell from nib in viewDidLoad
UINib *cellNib = [UINib nibWithNibName:#"NibCell" bundle:nil];
[self.appliancesCollectionView registerNib:cellNib forCellWithReuseIdentifier:#"cvCell"];
/////
-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {
return 1;
}
-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
return fileList.count;
NSLog(#"collection view count is %#",fileList);
}
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
// Setup cell identifier
static NSString *cellIdentifier = #"cvCell";
UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:cellIdentifier forIndexPath:indexPath];
NSString *fileName = [fileList objectAtIndex:indexPath.row];
cell.backgroundView = [[UIImageView alloc] initWithImage: [UIImage imageNamed: fileName]];
NSLog(#"cell Bg image %#",fileList);
return cell;
}
The probelm is nothing shows up in my collection view cells
The problem is that contentsOfDirectoryAtPath returns relative file paths. And you need absolute. Something like following should be used:
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsPath = [paths objectAtIndex:0];
NSArray *dirContents = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:documentsPath error:nil];
fileList=[[NSMutableArray alloc]init];
NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0]; // NEW LINE 1
for (NSString *filename in dirContents) {
NSString *fileExt = [filename pathExtension];
if ([fileExt isEqualToString:#"png"]) {
NSString *fullPath = [documentsDirectory stringByAppendingPathComponent:filename]; // NEW LINE 2
[fileList addObject:fullPath]; // NEW LINE 3
}
}
NSLog(#"document folder content list %# ",fileList);
You need to use imageWithContentsOfFile: instead imageNamed:
NSString * filePath = [[NSBundle mainBundle] pathForResource:<imageNameWithoutExtansion>ofType:<fileExtansion>];
cell.backgroundView = [[UIImageView alloc] initWithImage: [UIImage imageWithContentsOfFile: filePath]];
I am recently having a memory crash and I am suspecting that I am failing to empty the array, This is my code for the array
- (void)viewDidLoad
{
allImagesArray = [[NSMutableArray alloc] init];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *location=#"Bottoms";
NSString *fPath = [documentsDirectory stringByAppendingPathComponent:location];
NSArray *directoryContent = [[NSFileManager defaultManager] directoryContentsAtPath: fPath];
collectionBottoms.delegate =self;
collectionBottoms.dataSource=self;
for(NSString *str in directoryContent){
NSLog(#"i");
NSString *finalFilePath = [fPath stringByAppendingPathComponent:str];
NSData *data = [NSData dataWithContentsOfFile:finalFilePath];
if(data)
{
UIImage *image = [UIImage imageWithData:data];
[allImagesArray addObject:image];
NSLog(#"array:%#",[allImagesArray description]);
}}
}
Ho can I free the memory by releasing the object in the array?
You save the image array in Plist. After save you just re initialize your array it will clear the memory in array. Then are you using ARC or not? Because ARC is more comfortable for this. Then re-initialze or removeAllObject from array in -viewWillDisappear
Hi Just release the memory once object works is over. Here is the code for you.
- (void)viewDidLoad
{
allImagesArray = [[NSMutableArray alloc] init];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *location=#"Bottoms";
NSString *fPath = [documentsDirectory stringByAppendingPathComponent:location];
NSArray *directoryContent = [[NSFileManager defaultManager] directoryContentsAtPath: fPath];
collectionBottoms.delegate =self;
collectionBottoms.dataSource=self;
for(NSString *str in directoryContent)
{
NSString *finalFilePath = [fPath stringByAppendingPathComponent:str];
NSData *data = [NSData dataWithContentsOfFile:finalFilePath];
if(data)
{
UIImage *image = [UIImage imageWithData:data];
[allImagesArray addObject:image];
NSLog(#"array:%#",[allImagesArray description]);
image = nil;
}
finalFilePath=nil;
data=nil;
}
paths= nil;
documentsDirectory= nil;
location= nil;
fPath= nil;
directoryContent = nil;
}
If you are using this image array, allImagesArray, when the view is visible then put this code in viewWillAppear or viewDidAppear methods of UIViewController.
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
allImagesArray = [[NSMutableArray alloc] init];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *location=#"Bottoms";
NSString *fPath = [documentsDirectory stringByAppendingPathComponent:location];
NSArray *directoryContent = [[NSFileManager defaultManager] directoryContentsAtPath: fPath];
collectionBottoms.delegate =self;
collectionBottoms.dataSource=self;
for(NSString *str in directoryContent){
NSLog(#"i");
NSString *finalFilePath = [fPath stringByAppendingPathComponent:str];
NSData *data = [NSData dataWithContentsOfFile:finalFilePath];
if(data)
{
UIImage *image = [UIImage imageWithData:data];
[allImagesArray addObject:image];
NSLog(#"array:%#",[allImagesArray description]);
}
}
}
And, then release it in viewWillDisappear/viewDidDisappear methods of UIViewController.
- (void)viewDidDisappear:(BOOL)animated
{
[super viewDidDisappear:animated];
[allImagesArray removeAllObjects];
//[allImagesArray release]; // (Uncomment) Call this only if you are not using ARC.
}
Alternatively, a quick, dirty but safe fix is (without knowing your usage of allImagesArray) -
- (void)viewDidLoad
{
[super viewDidLoad];
// Remove previously added objects.
if (allImagesArray != nil && allImagesArray.count > 0) {
[allImagesArray removeAllObjects];
}
// Allocate memory if not done earlier (i.e. first time).
if (allImagesArray == nil) {
allImagesArray = [[NSMutableArray alloc] init];
}
// Rest of your code as stated in your question
}
I am saving my pictures into the collection view but I cannot delete the picture that I have took. I am using tap delete in the collection view. This is my code for that.However after I tap and delete the picture it looks like the picture is not deleted, and cannot find where is wrong, I am suspecting that it has something to do with the array but I am not sure.
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
allImagesArray = [[NSMutableArray alloc] init];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSArray *locations = [[NSArray alloc]initWithObjects:#"Bottoms", #"Dress", #"Coats", #"Others", #"hats", #"Tops",nil ];
NSString *fPath = documentsDirectory;
NSMutableArray *trashCan = [NSMutableArray array];
NSArray *directoryContent;
for(NSString *component in locations){
NSString *TrashBin = [fPath stringByAppendingPathComponent:component];
NSArray *directoryContent = [[NSFileManager defaultManager] directoryContentsAtPath: TrashBin];
collectionTrash.delegate =self;
collectionTrash.dataSource=self;
for(NSString *str in directoryContent){
NSLog(#"str:%#", str);
NSString *finalFilePath = [TrashBin stringByAppendingPathComponent:str];
NSData *data = [NSData dataWithContentsOfFile:finalFilePath];
[trashCan addObject:finalFilePath];
if(data)
{
UIImage *image = [UIImage imageWithData:data];
[allImagesArray addObject:image];
NSLog(#"array:%#",[allImagesArray description]);
}}}
Trash = trashCan;
for(NSString *folder in locations) {
for(NSString *file in directoryContent) {
// load the image
}
}}
- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
{
NSLog(#"j");
return 1;
}
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
return [allImagesArray count];
}
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *reuseID = #"ReuseID";
TrashCell *mycell = (TrashCell *) [collectionView dequeueReusableCellWithReuseIdentifier:reuseID forIndexPath:indexPath];
UIImageView *imageInCell = (UIImageView*)[mycell viewWithTag:1];
imageInCell.image = [allImagesArray objectAtIndex:indexPath.row];
NSLog(#"a");
return mycell;
}
-(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{
NSLog(#"s:%d", [Trash count]);
NSString *trashBin = [Trash objectAtIndex:indexPath.row];
NSLog(#"k%#l",trashBin);
[allImagesArray removeObjectAtIndex:indexPath.row];
[self.collectionTrash reloadData];
[self deleteMyFiles:trashBin];
}
NSString *myFileName;
-(void) deleteMyFiles:(NSString*)filePath {
NSError *error;
if([[NSFileManager defaultManager] fileExistsAtPath:filePath]) {
[[NSFileManager defaultManager] removeItemAtPath:filePath error:&error];
}
}
Be sure you delete the image in local memory also. When you delete image from collectionView not delete. Then stop the app and run it again see the deleted image is removed or not?. I think this is your problem. Then store all the image in single array and store it in plist. When you remove any image replace the array after removing the image in the array.
Use
[collectionView reloadData]
after calling deleteMyFiles.
I want to save an image that is displayed in the UIImage. However I want to categorize it in genre for example vegetables, meat, lettuce, etc.
I cannot find a way to do that.
What is the best and easiest way to do this?
Also I want to make the user select which category he wants to save using the picker controller to save.
Thank you! I really need help!!
Update 2
To check if it is saved I went further to construct a collection View controller and I get errors saying at the images part at the [arrayCollectionImages addObject:image]; Can you explain me about this last piece of code. I also have an warning at arrayCollectionImages saying local declaration of arrayColectionImages hide instance variable. –
#interface CollectionViewController (){
NSArray *arrayCollectionImages;
}
#end
#implementation CollectionViewController
- (void)viewDidLoad {
dispatch_queue_t searchQ = dispatch_queue_create("com.awesome", 0);
dispatch_async(searchQ, ^{
NSArray *arrayCollectionImages = [[NSArray alloc ]init];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *location=#"Hats";
NSString *fPath = [documentsDirectory stringByAppendingPathComponent:location];
NSArray *directoryContent = [[NSFileManager defaultManager] directoryContentsAtPath: fPath];
for(NSString *str in directoryContent){
NSString *finalFilePath = [fPath stringByAppendingPathComponent:str];
NSData *data = [NSData dataWithContentsOfFile:finalFilePath];
if(data)
{ dispatch_async(dispatch_get_main_queue(),^{
UIImage *image = [UIImage imageWithData:data];
});
[arrayCollectionImages addObject:images];
}
}
});
[super viewDidLoad];
}
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
CollectionCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:#"ReuseID" forIndexPath:indexPath];
[[cell collectionImageView]setImage:[UIImage imageNamed:[arrayCollectionImages objectAtindex:indexPath.item]]];
return cell;
}
-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{
return [arrayCollectionImages count];
}
#end
Step 1:
Set up a Picker Controller.
Here is the official reference.
Here is a tutorial.
Try to set it with all the genre values you want. You will learn about its delegate method:
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
that will return the genre selected.
Step 2:
Provide a save icon or a save button on each image. On click of that icon/button you should make your picker view appear and make user select any row and the image should be copied to a private variable or a property here, so as to refer it later in the delegate method.
Step 3:
When user selects a row, this delegate method is called. Here we will create a new directory , if not already exists, according to the genre selected In UIPickerView. Then you should write your image to the path.
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
//fetch Category Name from the array used to fill the Picker View
NSString *categoryName= [array objectAtIndex:row];
NSString *fPath = [documentsDirectory stringByAppendingPathComponent:categoryName];
NSFileManager *fileManager=[[NSFileManager alloc]init];
[fileManager createDirectoryAtPath:fPath withIntermediateDirectories:YES attributes:NO error:NO];
UIImage *image= captureImage;
NSData *data= UIImagePNGRepresentation(image);
[data writeToFile:fPath atomically:NO];
}
To retrieve images from a particular folder in your documents directory:
Create a path to that folder first. This will depend on a particular genre. Let's say Genre1.
// An array to save all images. You have to do this in some other way if selected images are big in size.
// For that case I suggest retrieving of images only when you are showing them on screen.
NSArray *allImagesArray = [[NSArray alloc ]init];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *location=#"Genre1";
NSString *fPath = [documentsDirectory stringByAppendingPathComponent:location];
NSArray *directoryContent = [[NSFileManager defaultManager] directoryContentsAtPath: fPath];
for(NSString *str in directoryContent){
NSString *finalFilePath = [fPath stringByAppendingPathComponent:str];
NSData *data = [NSData dataWithContentsOfFile:finalFilePath];
if(data)
{
UIImage *image = [UIImage imageWithData:data];
[allImagesArray addObject:image];
}
}