WordPress iOS API

I would like to know if there is an API for WordPress, built in Objective-C for iOS. This API must support the following:

• It must support custom servers (e.g. www.myblog.com, instead of myblog.wordpress.com).

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• It must allow me to make a post to the blog, and let me save a post as a draft.

• It preferably would be simple to set up, I simply authenticate the user, and have access to what I would want, similar to this

WordPress *wp = [[WordPress alloc] initWithServer:[NSURL URLWithString:@"http://www.myblog.com"];
[wp authenticate:@"wordpress-user-name" password:@"wordpress-user-password"];
[wp saveDraft:@"wordpress-post-name" content:@"wordpress-post-content" tags:@"wordpress-post-tags"];
[wp postDraft:@"wordpress-post-name"];
[wp logout];
[wp release];

If there is no such API out there, can anyone point me to some references that could help me get started on writing my own?

Thanks for your time