UIImagePickerController not presenting in iOS 8

I think this is because in iOS 8, alert views and action sheets are actually presented view controllers (UIAlertController). So, if you’re presenting a new view controller in response to an action from the UIAlertView, it’s being presented while the UIAlertController is being dismissed. I worked around this by delaying the presentation of the UIImagePickerController until the next iteration of the runloop, by doing this:

[[NSOperationQueue mainQueue] addOperationWithBlock:^{
    [self openPhotoPicker:sourceType];

However, the proper way to fix this is to use the new UIAlertController API on iOS 8 (i.e. use if ([UIAlertController class]) … to test for it). This is just a workaround if you can’t use the new API yet.

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