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iosobjective-cxcode-storyboard

How to change constraints programmatically that is added from storyboard?

I have one screen. It will display like below

enter image description here

Now When User clicked I have an Account and Password(button) it will display like below

enter image description here

I want to move both views accordingly I added constraints using storyboard.Now need to change constraints from programming..

Solution

  • You need to create an IBOutlet of your constraint.
    enter image description here

    Then you set the constant value of your constraint in code:

    labelWidthConstraint.constant = newValue

    If you want it animated you can do something like this:

    Swift

    labelWidthConstraint.constant = newValue
UIView.animate(withDuration: 0.3, animations: { 
    self.view.layoutIfNeeded()
})

    Objective-C

    self.labelWidthConstraint.constant = newValue;
[UIView animateWithDuration:0.3 animations:^{        
    [self.view layoutIfNeeded];
}];