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resignFirstResponder doesn't work on iPad
source link: https://fann.im/blog/2012/06/06/resignfirstresponder-doesnot-work-on-ipad/
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resignFirstResponder doesn't work on iPad
Jun 6, 2012
在 iPad 上，用 modalPresentationStyle = UIModalPresentationFormSheet 方式推出一个 viewController，这时这个 viewController 不会响应 resignFirstResponder，其他样式的 modalPresentationStyle 没有问题。苹果一个开发在开发者论坛说这是个 feature，不是 bug，devforums.apple.com
Was your view by any chance presented with the UIModalPresentationFormSheet style? To avoid frequent in-and-out animations, the keyboard will sometimes remain on-screen even when there is no first responder. This is not a bug.
就算不是 bug 也很恼人，有人给出了解决方法 devforums.apple.com。新建一个 UINavigationController category，禁掉 disablesAutomaticKeyboardDismissal：
- (BOOL)disablesAutomaticKeyboardDismissal
{
return NO;
}
然后把 viewController 挂在 UINavigationController 下即可：
MyViewController *myViewController = [[MyViewController alloc] initWithNibName:@"MyViewController" bundle:nil];
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:myViewController];
theNavigationController.modalPresentationStyle = UIModalPresentationFormSheet;
[self presentModalViewController:theNavigationController animated:YES];
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