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Automatically run UIAlertAction by UIAlertController software

I want my UIAlertController to click the Cancel button when my application goes to the background.

I have set a background notification with

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(appDidEnterBackground) name:UIApplicationDidEnterBackgroundNotification object:nil];

Then, in my appDidEnterBackground function, I have:

- (void)appDidEnterBackground {
    if (_alertController) {
        UIAlertAction *cancelAction = [[_alertController actions] objectAtIndex:0];

        //HERE: is there a way to trigger the cancelAction??

        [_alertController dismissViewControllerAnimated:NO completion:nil];
    }
}

What I am struggling with is how to programmatically trigger the UIAlertAction. Is it possible?

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1 answer


I answered this with a suggestion made by MCKapur.

I already had a UIAlertController in singleton mode. What I did was define a variable in my singlelet to keep the completion action:

@property (copy, nonatomic) void (^completion)(BOOL);

Then when I configured the UIAlertController to show it, I also set the completion code with:



_completion = ^(BOOL cancelled) {
    if (block) {
        block (NO, nil);
    }
};

Finally, I changed the call to appDidEnterBackground to:

- (void)appDidEnterBackground {
    if (_alertController) {
        if (_completion) {
            _completion(NO);
            _completion = nil;
        }
        [_alertController dismissViewControllerAnimated:NO completion:nil];
    }
}
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