CODEWITHSUNDEEP
iosobjective-cuiviewautolayoutconstraints
user5208463
user5208463

Reputation:

Center X of a programmatically created UIView to another UIView - Objective C

Just to try it out I create a Button programmatically as below

UIBUtton *button = [UIButton buttonWithType:UIButtonTypeSystem];
[button setTitle:@"Button" forState:UIControlStateNormal];
[button sizeToFit];
[self.view insertSubview:button belowSubview:_testlabel];

I already have an existing label inside my view named _testlabel. I am using autolayout and I wanted to center my newly added button's X to the _testlabel, I tried the below code in every possible way I could:

[self.view addConstraint:[NSLayoutConstraint
constraintWithItem:_testlabel attribute:NSLayoutAttributeCenterX
relatedBy:NSLayoutRelationEqual toItem:button
attribute:NSLayoutAttributeCenterX multiplier:1.0 constant:0.0]];

All I could do was center _testlabel's X to the newly added button, not the other way around. What am I missing here?

Upvotes: 2

Views: 554

Answers (1)

Larry Pickles
Larry Pickles

Reputation: 4646

You may need to do this to both your button and your label:

    [button setTranslatesAutoresizingMaskIntoConstraints:FALSE];
    [_testlabel setTranslatesAutoresizingMaskIntoConstraints:FALSE];

and then add additional resizing constraints using AutoLayout constraint formatting lanaguage using:

[self.view addConstraints: ... constraintsWithVisualFormat ...];

and/or also using more 

[self.view addConstraint: ... constraintWithItem ...]

Upvotes: 1

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