check the custom library present or not

Question

I want to check whether the library is present or not. How can I check whether a library with the same name already exists?

I wants to check the library created by below code is present or not programmatically, how i can check the library is present or not programmatically?

Thanks

I use the following code for saving a custom library.

//Code for create custom library and save image

-(void)savePhoto
{
self.library = [[ALAssetsLibrary alloc] init];
[self.library addAssetsGroupAlbumWithName:@"My Library" resultBlock:nil failureBlock:nil];
[self savePhotoFinal:[UIImage imageNamed:@"tattoo1.jpg"];
}

-(void)savePhotoFinal:(UIImage *)image
{
[self.library saveImage:image toAlbum:@"My Library" withCompletionBlock:^(NSError *error) {
    if (error!=nil) {
        NSLog(@"Big error: %@", [error description]);
    }
}];
}

@H2CO3 I wants to check the library created by above code is present or not programmatically, how i can check the library is present or not programmatically? — QueueOverFlow, Dec 12 '12 at 11:17

iShwar · Answer 1 · 2012-12-12T11:45:50.737

1

When you create the custom library, and save the file in it, At the same time set a flag Using NSUserDefault, like

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
 [defaults setValue:@"0" forKey:@"LIBRARYEXIST"];

and latter jus check whether the string value of this saved flag is 0 or not with

  NSString *libraryCheckStr =[defaults objectForKey:@"LIBRARYEXIST"];

if the value of string variable libraryCheckStr is found as a 0 then the library exist other wise does not exists.

When the User will delete the library manually on the action method of deleting library, set the flag to 1 for the same key LIBRARYEXIST . and further is your business logic .

edited Dec 12 '12 at 11:45

answered Dec 12 '12 at 11:25

iShwar

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thanks for reply, but if user manually delete the added custom library, then? – QueueOverFlow Dec 12 '12 at 11:41
NOTE: Don't forget to make the NSUserDefaults object as a global! – iShwar Dec 12 '12 at 11:49
i mean that if user delete custom library itself without using my application. So i have to check every time library exist or not when my app executed. – QueueOverFlow Dec 12 '12 at 11:52
have you visit http://stackoverflow.com/questions/7221167/how-to-check-if-an-alasset-still-exists-using-a-url – iShwar Dec 12 '12 at 12:21
Also Visit: 1) http://death-mountain.com/2011/05/alassetslibrary-and-threads/ 2) http://developer.apple.com/library/ios/#documentation/AssetsLibrary/Reference/ALAssetsLibrary_Class/Reference/Reference.html – iShwar Dec 12 '12 at 12:26

check the custom library present or not

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