iOS问题记录UIAlertViewController弹出时崩

解决方案

1. 子类化 UIAlertViewController
2. 实现下面几个方法

- (NSUInteger)supportedInterfaceOrientations {
    return UIInterfaceOrientationMaskAll;
}

- (BOOL) shouldAutorotate {
    return YES;
}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {
    return UIInterfaceOrientationPortrait;
}