Renaming the images in ipad and then saving that image to app bundle?

I am creating an app in which i am 开发者_StackOverflow社区displaying images from photo library and app bundle by clicking on two separate action buttons.

Now what i want is that i want to create a new action button and its purpose will be to select an image from photo library and then save that image into my app bundle.

Can anyone guide me to right direction regarding this topic.

Thanks, Christy

I don't think you can modify the application bundle once it's on the iPhone. The entire thing is code signed, and changing it would cause it to not run any more. You can try saving the image to documents directory.

So far as I know you cannot repackage the bundles on the iPhone once your app has been released to the App Store. So go the other way, and put the data from the bundle on the filesystem so you can change it at runtime.

My usual technique for this stuff is:

1. bundle up the initial data
2. have a routine that checks for the presence of a versioned file on the iPhone's filesystem at startup
3. if that routine doesn't find the current version of the file, copy all the data into the iPhone's filesystem
4. reference the data from the filesystem in my app, rather than using the bundle path

So, essentially your bundle is just a delivery mechanism, a way to preload the filesystem with the stuff you are going to need. Once it's on the filesystem you can change anything you wish.

References

Downloading image into bundle?

How to save a UIImage to the application's Bundle?

UPDATE

- (IBAction)saveImage:(UIImage *)image {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,     NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *savedImagePath = [documentsDirectory stringByAppendingPathComponent:@"savedImage.png"];
NSData *imageData = UIImagePNGRepresentation(image);// Change according to your needs
[imageData writeToFile:savedImagePath atomically:NO];   
}

You can make an NSData from the image you are picking from your photo library by using this -

NSData *imageData = UIImageJPEGRepresentation (UIImage *image,CGFloat compressionQuality);

then call

[imageData writeToFile:imgPath atomically:YES];

Here imgPath is the path for TMP dirextory where you want to write the file, get it as -

NSString *filename = @"a.png";

NSString *uniquePath = [TMP stringByAppendingPathComponent:filename];

and TMP is an enum

#define TMP NSTemporaryDirectory()