'NSInvalidArgumentException', reason: 'Unable to parse constraint format'

Question

I have a subview that I want to keep stops during rotating screen, so I decided to put the NSLayoutConstraint type:

Trailing Space to Superview
Top Space to Supe

Answer 1

My trick is to simply declare a local variable that's just another pointer to the property, and put it in the NSDictionaryOfVariableBindings.

@interface ViewController ()
@property (strong) UIButton *myButton;
@property (strong) UILabel *myLabel;
@end

...

UIButton *myButtonP = self.myButton;
UILabel *theLabelP = self.myLabel;
NSDictionary *viewsDictionary = NSDictionaryOfVariableBindings(myButtonP, myLabelP);

The P suffix is for "pointer".