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February 1, 2016 10:30
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Sometimes when add child view controller programmatically and just add subview fill all container. You have to add constraint again and again. This snip set code will help you add by one line of code.
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| //Add constraint with top left right bottom is (0, 0, 0, 0) | |
| func addConstraintsChildToContainer(parent container: UIView, child childView: UIView) { | |
| container.addSubview(childView) | |
| let views = Dictionary(dictionaryLiteral: ("childView", childView),("container", container)) | |
| //Horizontal constraints | |
| let horizontalConstraints = NSLayoutConstraint.constraintsWithVisualFormat("H:|[childView]|", options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: views) | |
| container.addConstraints(horizontalConstraints) | |
| //Vertical constraints | |
| let verticalConstraints = NSLayoutConstraint.constraintsWithVisualFormat("V:|[childView]|", options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: views) | |
| container.addConstraints(verticalConstraints) | |
| } | |
| //Add constraint with top left right bottom is same with option UIEdgeInsets | |
| func addConstraintsChildToContainer(parent container: UIView, child childView: UIView, andInsets insets: UIEdgeInsets) { | |
| container.addSubview(childView) | |
| let views = Dictionary(dictionaryLiteral: ("childView", childView),("container", container)) | |
| //Horizontal constraints | |
| let horizontalConstraints = NSLayoutConstraint.constraintsWithVisualFormat("H:|-\(insets.left)-[childView]-\(insets.right)-|", options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: views) | |
| container.addConstraints(horizontalConstraints) | |
| //Vertical constraints | |
| let verticalConstraints = NSLayoutConstraint.constraintsWithVisualFormat("V:|-\(insets.top)-[childView]-\(insets.bottom)-|", options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: views) | |
| container.addConstraints(verticalConstraints) | |
| } |
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