Use archive to save the image to a local device,

Use archive to save the image to a local device,

 

Source code: http://url.cn/OaPZa2

 

Today, archive images are saved locally.

 

You cannot use NSUserDefault to save images. NSUserDefault can only save basic types and cannot save objects.

 

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Code:

-(Void) viewDidLoad {[super viewDidLoad]; // Do any additional setup after loading the view. // initialize the background image. imageView = [[UIImageView alloc] initWithFrame: CGRectMake (100,100,100,100)]; imageView. backgroundColor = [UIColor redColor]; [self. view addSubview: imageView]; // Save the image [self archive]; // extract the local image [self unarchive];} # pragma-mark-functions // archive-(void) archive {NSData * data = [NSKeyedArchiver archivedDataWithRootObject: [UIImage imageNamed: @ "1.jpg"]; NSUserDefaults * imageDefault = [NSUserDefaults standardUserDefaults]; [imageDefault setObject: data forKey: @ "image"]; [imageDefault synchronize];} // unarchive-(void) unarchive {NSData * data = [[NSUserDefaults standardUserDefaults] objectForKey: @ "image"]; id image = [NSKeyedUnarchiver unarchiveObjectWithData: data]; imageView. image = image ;}