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: Donald Hall <email@hidden>
- Date: Sun, 29 Dec 2013 23:50:28 -0700
Roland,
Thanks for the quick reply! Yes that was the problem. I just copied straight from Apple's example. I guess they got it wrong. :-(
Unfortunately, this caused the toolbar to disappear on the iPad simulator. I'll have to try another approach to getting the toolbar to not underlap the status bar.
Best, Don
------------
Don Hall
Apps & More Software Design, Inc.
http://www.appsandmore.com
email@hidden
On 2013-12-29, at 11:36 PM, Roland King <email@hidden> wrote:
> 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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