Taking screenshot from an iPhone App

UIGraphicsBeginImageContext(self.view.bounds.size);
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];

UIImage *saveImage = UIGraphicsGetImageFromCurrentImageContext();

CGContextRef context = UIGraphicsGetCurrentContext();

UIImageWriteToSavedPhotosAlbum(saveImage, self, @selector(image:didFinishSavingWithError:contextInfo:),  &context);

UIGraphicsEndImageContext();

NSData *imageData = UIImagePNGRepresentation(saveImage);

NSString *imageName = @"temp.png";

NSArray* paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

NSString* documentsDirectory = [paths objectAtIndex:0];

NSString* fullPathToFile = [documentsDirectory stringByAppendingPathComponent:imageName];

[imageData writeToFile:fullPathToFile atomically:NO];

 Above code takes screenshot of the view & save this image in the documentsDirectory as "temp.png"

 NSInteger primaryKeyValue = 1;

 NSArray* paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

 NSString* documentsDirectory = [paths objectAtIndex:0];

 NSString* fullPathToFile = [documentsDirectory stringByAppendingPathComponent:@"temp.png"];

 NSString *filePath2 = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat: @"%d.png",primaryKeyValue ]];

 NSFileManager *fileMgr = [NSFileManager defaultManager];

[fileMgr moveItemAtPath:fullPathToFile toPath:filePath2 error:nil];

 Later, if you want to use this image

 NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 

 NSString *uniquePath = [[paths objectAtIndex:0] stringByAppendingPathComponent:[NSString stringWithFormat: @"%d.png",primaryKeyValue ]]; 

UIImage *image = [UIImage imageWithContentsOfFile:uniquePath];