How save images in home directory? - iphone

Question

I am making an application in which i have use Json parsing. With the help of json parsing i get photo url which is saved in string. To show images in my cell i use this code
NSString *strURL=[NSString stringWithFormat:#"%#", [list_photo objectAtIndex:indexPath.row]];
NSData *imageData = [[NSData alloc] initWithContentsOfURL: [NSURL URLWithString: strURL]];
CGRect myImage =CGRectMake(13,5,50,50);
UIImageView *imageView = [[UIImageView alloc] initWithFrame:myImage];
[imageView setImage:[UIImage imageWithData: imageData]];
[cell addSubview:imageView];
Now prblem is that when i go back or forword then i have wait for few second to come back on same view. Now i want that i when application is used first tme then i wait for that screen otherwise get images from home directory. How i save these image in my home directory? How access from home directory?

Answer 1

You can save an image in the default documents directory as follows using the imageData;
// Accessing the documents directory
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *savedImagePath = [documentsDirectory stringByAppendingPathComponent:#"myImage.png"];
//Writing the image file
[imageData writeToFile:savedImagePath atomically:NO];

Answer 2

You can use this to write a file to your Documents Folder
+(BOOL) downloadFileFromURL:(NSString *) url withLocalName:(NSString*) localName
{
//Get the local file and it's size.
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *finalPath = [documentsDirectory stringByAppendingPathComponent:localName];
NSError *error;
NSDictionary *fileAttributes = [[NSFileManager defaultManager] attributesOfItemAtPath:finalPath error:&error];
NSAssert (error == nil, ([NSString stringWithFormat:#"Error: %#", error]));
if (error) return NO;
int localFileSize = [[fileAttributes objectForKey:NSFileSize] intValue];
//Prepare a request for the desired resource.
NSMutableURLRequest *request = [NSMutableURLRequest
requestWithURL:[NSURL URLWithString:url]];
[request setHTTPMethod:#"HEAD"];
//Send the request for just the HTTP header.
NSURLResponse *response;
[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
NSAssert (error == nil, ([NSString stringWithFormat:#"Error: %#", error]));
if (error) return NO;
//Check the response code
int status = 404;
if ([response respondsToSelector:#selector(statusCode)])
{
NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse*) response;
status = [httpResponse statusCode];
}
if (status != 200)
{
//file not found
return NO;
}
else
{
//file found
}
//Get the expected file size of the downloaded file
int remoteFileSize = [response expectedContentLength];
//If the file isn't already downloaded, download it.
if (localFileSize != remoteFileSize || (localFileSize == 0))
{
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:url]];
[[NSFileManager defaultManager] createFileAtPath:finalPath contents:data attributes:nil];
return YES;
}
//here we may wish to check the dates or the file contents to ensure they are the same file.
//The file is already downloaded
return YES;
}
and this to read:
+(UIImage*) fileAtLocation:(NSString*) docLocation
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *finalPath = [documentsDirectory stringByAppendingPathComponent:docLocation];
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:url]];
[[NSFileManager defaultManager] createFileAtPath:finalPath contents:data attributes:nil];
NSData *databuffer = [[NSFileManager defaultManager] contentsAtPath:finalPath];
UIImage *image = [UIImage imageWithData:databuffer];
return image;
}