'NSInvalidArgumentException', reason: 'Unable to parse constraint format: Expected a view
'NSInvalidArgumentException', reason: 'Unable to parse constraint format: Expected a view
- Subject: 'NSInvalidArgumentException', reason: 'Unable to parse constraint format: Expected a view
- From: Donald Hall <email@hidden>
- Date: Sun, 29 Dec 2013 23:28:17 -0700
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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