CODEWITHSUNDEEP
iosimagestoragensuserdefaults
Andres
Andres

Reputation: 105

Persistent image storage in iOS

Im using this method in order to store images and it is to my understanding that this method stores data persistently. The problem is that when I restart the simulator al the images are gone/unable to load. Anyway here's the code:

- (NSString *)saveImage:(NSMutableString*)account{
        NSString *dir=[NSString stringWithFormat:@"http://example.com"];
        NSURL *url=[NSURL URLWithString:dir];
        NSData *imageData = UIImagePNGRepresentation([UIImage imageWithData:[NSData dataWithContentsOfURL:url]]);
        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
        NSString *documentDirectory = [paths objectAtIndex:0];
        NSString *imageName = [NSString stringWithFormat:@"%@%@", account,@"Banner.png"];
        NSString *imagePath = [documentDirectory stringByAppendingFormat:imageName];
        NSLog((@"pre writing to file"));
        NSError *writeError = nil;
        if(![imageData writeToFile:imagePath options:NSDataWritingAtomic error:&writeError]){
            NSLog(@"%@: Error saving image: %@",[self class], [writeError localizedDescription]);
        }
        else{
            NSLog(@"the cachedImagePath is %@", imagePath);
            return imagePath;
        }
        return NULL;
    }

This is the method used to load the image:

[UIImage imageWithContentsOfFile:bannerPath]

bannerPath is the imagePath returned from the saving method stored in NSUserDefaults.

Am I doing something wrong? How can I fix it? Thanks.

edit: I check with the following method if the file exists:

[[NSFileManager defaultManager] fileExistsAtPath:bannerPath];

I returns false.

Upvotes: 0

Views: 105

Answers (2)

DigitalBrain_DEV
DigitalBrain_DEV

Reputation: 1103

NSString *imagePath = [documentDirectory stringByAppendingFormat:imageName];

i think should be 

NSString *imagePath =    [documentDirectory stringByAppendingPathComponent:imageName];

Upvotes: 1

hsarret
hsarret

Reputation: 446

This line

NSString *imageName = [NSString stringWithFormat:@"%@%@", account,@"Banner.png"];

is missing a /, it should be

NSString *imageName = [NSString stringWithFormat:@"/%@%@", account,@"Banner.png"];

You were writing an image name "DocumentsxxxxBanner.png" in directory

/Users/xxxx/Library/Developer/CoreSimulator/Devices/D523E2E5-0B28-4D0D-8187-67D50A628481/data/Containers/Data/Application/82F36569-C3C0-46D9-AF60-044F7B484724/

instead of an image named "xxxxBanner.png" in directory

/Users/xxxx/Library/Developer/CoreSimulator/Devices/D523E2E5-0B28-4D0D-8187-67D50A628481/data/Containers/Data/Application/82F36569-C3C0-46D9-AF60-044F7B484724/Documents

Cheers

Upvotes: 0

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