Where is NSAlert.h in the iOS SDK?

Question

According to iOS's Using and Creating Error Objects, one can display a error object with the following code.

NSError *theError = nil;
BOOL success = [myDoc writeToURL:[self docURL] ofType:@"html" error:&theError];

if (success == NO) {
    // Maybe try to determine cause of error and recover first.
    NSAlert *theAlert = [NSAlert alertWithError:theError];
    [theAlert runModal]; // Ignore return value.
}

Unfortunately, I am not smart enough to figure out how to include NSAlert.h.

Any help would be appreciated.

Answer 1

That document is referring to the (OS X) AppKit framework. Right after that box, it says:

(UIAlertView, the UIKit class corresponding to NSAlert, has no equivalent method for alertWithError:.)

You can still use UIAlertView, but you'll need to manually populate the title, message, and button strings from the error.

Answer 2

NSAlert isn't availble in UIKit. the example it just an copy past of the OS X doc.

This code in Listing 2-1 uses the returned NSError to display an error alert to the user immediately. (UIAlertView, the UIKit class corresponding to NSAlert, has no equivalent method for alertWithError:.) Error objects in the Cocoa domain are always localized and ready to present to users, so they can often be presented without further evaluation.