Saving data - does work on Simulator, not on Device
- by Peter Hajas
I use NSData to persist an image in my application. I save the image like so (in my App Delegate):
- (void)applicationWillTerminate:(UIApplication *)application
{
NSLog(@"Saving data");
NSData *data = UIImagePNGRepresentation([[viewController.myViewController myImage]image]);
//Write the file out!
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *path_to_file = [documentsDirectory stringByAppendingString:@"lastimage.png"];
[data writeToFile:path_to_file atomically:YES];
NSLog(@"Data saved.");
}
and then I load it back like so (in my view controller, under viewDidLoad):
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *path_to_file = [documentsDirectory stringByAppendingString:@"lastimage.png"];
if([[NSFileManager defaultManager] fileExistsAtPath:path_to_file])
{
NSLog(@"Found saved file, loading in image");
NSData *data = [NSData dataWithContentsOfFile:path_to_file];
UIImage *temp = [[UIImage alloc] initWithData:data];
myViewController.myImage.image = temp;
NSLog(@"Finished loading in image");
}
This code works every time on the simulator, but on the device, it can never seem to load back in the image. I'm pretty sure that it saves out, but I have no view of the filesystem.
Am I doing something weird? Does the simulator have a different way to access its directories than the device?
Thanks!
