您的位置：首页 > 产品设计 > UI/UE

Add child view controller to UINavigationController

2015-12-18 17:48 1641 查看

http://stackoverflow.com/questions/19257999/add-child-view-controller-to-uinavigationcontroller
I'm trying to add a child view controller to a

UIViewController

contained
in a

UINavigationController

with
this code:

- (void)buttonTapped:(id)sender
{
MyChildController *viewController = [self.storyboard instantiateViewControllerWithIdentifier:@"MyChild"];
[self addChildViewController:viewController];
[self.view addSubview:viewController.view];
[viewController didMoveToParentViewController:self];

viewController.view.alpha = 0.0f;
[UIView animateWithDuration:0.4 animations:^{
viewController.view.alpha = 1.0f;
}];
}

But this is the result:

As you can see the

UINavigatioBar

and
the

UIToolbar

are
still on top of the child view controller. How can I put the child view controller on top of all? I've already tried to replace the code with:

[self.navigationController addChildViewController:viewController];
[self.navigationController.view addSubview:viewController.view];
[viewController didMoveToParentViewController:self.navigationController];

But in this way the

viewDidAppear:animated

of
the

viewController

doesn't
get called, dunno why.

iphone objective-c uiviewcontroller ios7 childviewcontroller

shareimprove
this question

edited Jan
21 at 15:38

Community♦
1

asked Oct 8 '13 at 20:44

Fred Collins
1,15693488

add
a comment

2 Answers

active oldest votes

up vote5down
voteaccepted

In your first view controller, do something like this:

- (IBAction)buttonClick:(id)sender
{
SecondViewController *secondView = [self.storyboard instantiateViewControllerWithIdentifier:@"SecondViewController"];
UIImage *blurryImage = [UIImage imageNamed:@"foo.jpeg"];
secondView.imageView.image = blurryImage;
[self.navigationController addChildViewController:secondView];
secondView.view.frame = self.navigationController.view.frame;
[self.navigationController.view addSubview:secondView.view];
}

Then in your second view controller, add the getter for your imageview:

-(UIImageView *)imageView
{
if( _imageView == nil )
{
_imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 320, 548)];
[self.view addSubview:_imageView];
}
return _imageView;
}

shareimprove
this answer

edited Oct
9 '13 at 0:52

answered Oct 8 '13 at 23:05

JonahGabriel
2,2871719

I'm trying to use the viewcontroller-container approach because I need to blur the background view of the modal view
controller that is also semi-transparent. The effect is the same as notification view that you pull down from the top of the screen. The background is semi-transparent and it's also blur/frosted glass. Why if I add a child view controller to

self.navigationController

the

viewDidAppear

method
is not called? – Fred
Collins Oct
8 '13 at 23:21

Hmm...not quite sure...have you tried calling [viewController viewWillAppear:NO]? – JonahGabriel Oct
8 '13 at 23:38

Yes and it does nothing. I need to call

[viewController
viewDidAppear:NO]

just after the line

[viewController
didMoveToParentViewController:self.navigationController]

. Why the hell the methods are not called? Otherwise if I add the child view controller to

self

and
not

self.navigationController

it
works but as showed in the above image the view is 'inside' the

navigationController

. – Fred
Collins Oct
8 '13 at 23:44

So I just coded up a simple case of your problem and it looks like viewDidLoad is getting called. Why not put your logic
in there? I am imagining you are deallocating your view when it gets hidden right? – JonahGabrielOct
8 '13 at 23:51

In order for

viewWillAppear:

and

viewDidAppear:

to
be called, you need to send the message

-beginAppearanceTransition:animated:

to
the view controller responsible for the view you added. Then you do the animation, if any. And in the animation completion block, send

-endAppearanceTransition

to
the view controller that appeared. NOTE: Do not call

[viewController
viewDidAppear:NO]

- you should never invoke these methods yourself. – Sam Nov
12 '13 at 10:41

show 4 more
comments

up vote14down
vote

@Sam's comment is correct. You need to call

beginApperanceTransition:animated:

and

endAppearanceTransition

for

viewDidAppear

to
be triggered. The reason why

UINavigationController

does
not call

viewDidAppear

when
you add a child view controller is because it has overridden its container composition methods to prevent the programmer from adding a child view controller in strange places. In your case, it doesn't want your child view to cover up the navigation bar. The
correct usage of a navigation controller is to have children appear under the navigation bar. Nonetheless, you can still force upon this non-standard UI by manually telling the child when it is appearing and when it has finished appearing.

Add a child to UINavigationController

MyChildViewController* child = [[MyChildViewController alloc] init]l
[self.navigationController addChildViewController:child];
child.view.frame = self.navigationController.bounds;
[self.navigationController.view addSubjvew:child.view];
child.view.alpha = 0.0;
[child beginAppearanceTransition:YES animated:YES];
[UIView
animateWithDuration:0.3
delay:0.0
options:UIViewAnimationOptionCurveEaseOut
animations:^(void){
child.view.alpha = 1.0;
}
completion:^(BOOL finished) {
[child endAppearanceTransition];
[child didMoveToParentViewController:self.navigationController];
}
];

Remove a child from UINavigationController

[child willMoveToParentViewController:nil];
[child beginAppearanceTransition:NO animated:YES];
[UIView
animateWithDuration:0.3
delay:0.0
options:UIViewAnimationOptionCurveEaseOut
animations:^(void){
child.view.alpha = 0.0;
}
completion:^(BOOL finished) {
[child endAppearanceTransition];
[child.view removeFromSuperview];
[child removeFromParentViewController];
}
];

shareimprove
this answer

edited Jul
26 at 14:14

kernix
8861831

answered Mar 25 '14 at 21:19

Pwner
1,19211643

I think child be calling

didMoveToParentViewController:

when
its being removed.. Something like,

[child
didMoveToParentViewController:nil]

– Mohammad
Abdurraafay May
11 '14 at 8:37

It helped me ... thank you. Gave upvote Pwner. – Meenu Jul
29 '14 at 12:43

very helpful, thanks! – kernix Jul
26 at 12:48

add
a comment

内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理

标签：

相关文章推荐

新的分享

章节导航