How to Store the image in NSUserDefaults?

Question

facing with one problem,How to store images in NSUserDefaults that image contains url like this (www.example.com/1.png),how to store that images help me please. Here is my code,

listBannerArray =[NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];

imageArray = [listBannerArray valueForKey:@"mainbanner"];
NSLog(@"%@",imageArray);

NSUserDefaults *imageDefaults = [NSUserDefaults standardUserDefaults];
        [imageDefaults setObject:imageArray forKey:@"kPrefKeyForMainBanner"];
        NSLog(@"image :%@",[imageDefaults objectForKey:@"kPrefKeyForMainBanner"]);

Here listBannerArray is my total response and imageArray is my images array. Please help!

Thanks in advance.

Check this http://stackoverflow.com/questions/6648518/save-images-in-nsuserdefaults — Uma Madhavi, Feb 09 '16 at 10:20
[[NSUserDefaults standardUserDefaults] setObject:UIImagePNGRepresentation(image) forKey:key]; here what is image? — User558, Feb 09 '16 at 10:52
yes images are stored in my imageArray but that is in the format of url — User558, Feb 09 '16 at 11:37
you just should not store bulk data in `NSUserDefaults`; the `Documents` folder is your friend here. — holex, Feb 09 '16 at 11:40
@MangiReddy, why? where have you been stuck during the implementation? — holex, Feb 09 '16 at 11:59
@holex i am getting images into imageArray,but that will be a url? how can i hit that url and save that image into userdefaults — User558, Feb 09 '16 at 12:02
@MangiReddy, you _do not_ want to save any bulk data into the `NSUserDefaults`; for fetching an image via http:// scheme you can use `NSURLSession`. — holex, Feb 09 '16 at 12:03

score 3 · Answer 1 · edited Jul 11 '17 at 06:38

3

To save an image in NSUserDefaults:

[[NSUserDefaults standardUserDefaults]setObject:UIImagePNGRepresentation(image) forKey:key];

To retrieve an image from NSUserDefaults:

NSData* imageData = [[NSUserDefaults standardUserDefaults] objectForKey:key];
UIImage* image = [UIImage imageWithData:imageData];

edited Jul 11 '17 at 06:38

Tejas Ardeshna

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answered Feb 09 '16 at 11:51

Femina Brahmbhatt

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score 1 · Answer 2 · edited May 23 '17 at 12:07

1

You can read how to do such thing in this post, but again - it's not the best practice to do.

For correct approach, check this, for example.

edited May 23 '17 at 12:07

Community

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answered Feb 09 '16 at 11:48

keyv

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score 0 · Answer 3 · edited Jul 11 '17 at 06:39

You can store and retrieve an image from NSUserDefaults like this:

NOTE:-

1.If you have UIImage object then you need to use UIImagePNGRepresentation to store .png image.

2.For .jpg/.jpeg UIImageJPEGRepresentation( lossy compression)if you use a compressionQuality value smaller than 1.0, you can lose some image quality.

[[NSUserDefaults standardUserDefaults]setObject:UIImagePNGRepresentation(image) forKey:@"yourKey"];

To retrieve an image from NSUserDefaults you can get it from NSData:

NSData* imageData = [[NSUserDefaults standardUserDefaults] objectForKey:@"yourKey"]; 
UIImage* image = [UIImage imageWithData:imageData];

How to Store the image in NSUserDefaults?

3 Answers3