Save image and information about image on iPhone

Question

I retrieve image and its information (origin and some other info) from web. How can I store that on iPhone ? I saw using NSFileManager for storing images, but how can I store image and some other information with it ? Should I use NSDictionary and keys like - image, origin, info and then store that dictionary to NSMutableArray and then store that array to NSFileManager ?? Or is there some other way ? And small hint on accessing those saved images and corresponding information would be nice.

Thanks.

Answer 1

// Download Image from Remote Server
NSURL *url = [NSURL URLWithString:@"Your IMAGE URL HERE"];
NSData *data = [NSData dataWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"moon" ofType:@"jpg"]];

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);
NSString *libPath = [paths objectAtIndex:0];
NSString *filePath = [libPath stringByAppendingPathComponent:[url lastPathComponent]];
BOOL status = [data writeToFile:filePath atomically:YES];
// Save Image file to Library Directory, if success then store infor about it in file
if(status)
{
    // If File Exist then read it otherwise creat new
    NSMutableDictionary *imageInfoDict;
    if([[NSFileManager defaultManager] fileExistsAtPath:[libPath stringByAppendingPathComponent:@"imageInfo.plist"]])
    {
        NSData *fileData = [NSData dataWithContentsOfFile:[libPath stringByAppendingPathComponent:@"imageInfo.plist"]];
        imageInfoDict = [NSMutableDictionary dictionaryWithDictionary:[NSKeyedUnarchiver unarchiveObjectWithData:fileData]];

        // To set As Background Load image from disc
        // Read filename from Dictionary, but you must know the key which you want to get
        NSString *fileName = imageInfoDict[@"68051_10151509108346729_1731694342_s.png"][@"imagePath"];
        // Set your image as background
        UIImage *image = [UIImage imageWithContentsOfFile:[libPath stringByAppendingPathComponent:fileName]];
    }
    else
        imageInfoDict = [NSMutableDictionary dictionaryWithCapacity:0];

    // Create Dictionary to store Single Image Info
    NSDictionary *imageInfo = [NSDictionary dictionaryWithObjectsAndKeys:[url lastPathComponent], @"imagePath",
                               [url lastPathComponent], @"imageName",
                               [NSDate date], @"date",nil];
    // Add Single Image Info to Main Dictionary
    [imageInfoDict setValue:imageInfo forKey:[url lastPathComponent]];

    // Convert Main info Dictionary to `NSData` to Save on Disc
    NSData *fileData = [NSKeyedArchiver archivedDataWithRootObject:imageInfoDict];
    // Save file to Disc
    [fileData writeToFile:[libPath stringByAppendingPathComponent:@"imageInfo.plist"] atomically:YES];

    // Read Info From File
    NSLog(@"%@",[NSDictionary dictionaryWithContentsOfFile:[libPath stringByAppendingPathComponent:@"imageInfo.plist"]]);
}