condition of allowed run the application in the both iPhone sdk etc.

Ref.: AvailabilityInternel.h class

//#if __IPHONE_3_2 >= __IPHONE_OS_VERSION_MAX_ALLOWED

//#endif

NSFileManager to save an image to or load/remove an image from documents directory

Reference link :
http://www.friendlydeveloper.com/2010/02/using-nsfilemanager-to-save-an-image-to-or-loadremove-an-image-from-documents-directory-coding/
special thanks for "friendlydeveloper"

NSFileManager offers a convenient way to write images to and load them from the documents directory.

If you’re frequently doing that in your project, I suggest to wrap up NSFileManager support in three simple methods:

01	//saving an image

02

03	- (void)saveImage:(UIImage*)image:(NSString*)imageName {

04

05	NSData *imageData = UIImagePNGRepresentation(image); //convert image into .png format.

06

07	NSFileManager *fileManager = [NSFileManager defaultManager];

08

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

10

11	NSString *documentsDirectory = [paths objectAtIndex:0];

12

13	NSString *fullPath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.png", imageName]];

14

15	[fileManager createFileAtPath:fullPath contents:imageData attributes:nil];

16

17	NSLog(@"image saved");

18

19

}

20

21	//removing an image

22

23	- (void)removeImage:(NSString*)fileName {

24

25	NSFileManager *fileManager = [NSFileManager defaultManager];

26

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

28

29	NSString *documentsDirectory = [paths objectAtIndex:0];

30

31	NSString *fullPath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.png", fileName]];

32

33	[fileManager removeItemAtPath: fullPath error:NULL];

34

35	NSLog(@"image removed");

36

37

}

38

39	//loading an image

40

41	- (UIImage*)loadImage:(NSString*)imageName {

42

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

44

45	NSString *documentsDirectory = [paths objectAtIndex:0];

46

47	NSString *fullPath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.png", imageName]];

48

49	return [UIImage imageWithContentsOfFile:fullPath];

50

51

}

Now, you can easily save an image like:

1	[self saveImage: myUIImage: @"myUIImageName"];

or load it like:

1	myUIImage = [self loadImage: @"myUIImageName"];

or remove it like:

1	[self removeImage: @"myUIImageName"];