Re: 'NSInvalidArgumentException', reason: 'Unable to parse constraint format: Expected a view
Re: 'NSInvalidArgumentException', reason: 'Unable to parse constraint format: Expected a view
- Subject: Re: 'NSInvalidArgumentException', reason: 'Unable to parse constraint format: Expected a view
- From: Roland King <email@hidden>
- Date: Mon, 30 Dec 2013 14:36:06 +0800
Do you really have a space between V: and [toolbar]? I'd remove that.
On 30 Dec, 2013, at 2:28 pm, Donald Hall <email@hidden> wrote:
> Hi all,
>
> I am trying to add a layout constraint to my container view programmatically by putting the following code in the view controller (which I got and modified from Apple's UIViewController docs):
> -------------
> [toolbar setTranslatesAutoresizingMaskIntoConstraints: NO];
> id topGuide = self.topLayoutGuide;
> NSDictionary *viewsDictionary = NSDictionaryOfVariableBindings (toolbar, topGuide);
> [self.view addConstraints:
> [NSLayoutConstraint constraintsWithVisualFormat: @"V: [toolbar]-20-[topGuide]"
> options: 0
> metrics: nil
> views: viewsDictionary]];
> [self.view layoutSubviews]; // You must call this method here or the system raises an exception
> -------------
> "toolbar" is a UIToolBar at the top of the view.
>
> This doesn't work. I get the following:
>
> 'NSInvalidArgumentException', reason: 'Unable to parse constraint format:
> Expected a view
> V: [toolbar]-20-[topGuide]
> ^'
>
> Does anyone have any ideas where I am going wrong? I tried using the view instead of topGuide, but got the same error message.
>
> I am trying to keep the tool bar from underlapping the status bar in iOS 7, while keeping iOS 6 compatibility. (Xcode 5.0.2, Base SDK iOS 7.0)
>
> Thanks, Don
>
> ------------
> Don Hall
> Apps & More Software Design, Inc.
> http://www.appsandmore.com
> email@hidden
>
>
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