Width and Height Equal to its superView using autolayout programmatically?

If someone is looking for a Swift solution – I would create a Swift extension for UIView which will help you each time you want to bind a subviews frame to its superviews bounds:

Swift 2:

extension UIView {    /// Adds constraints to this `UIView` instances `superview` object to make sure this always has the same size as the superview.    /// Please note that this has no effect if its `superview` is `nil` – add this `UIView` instance as a subview before calling this.    func bindFrameToSuperviewBounds() {        guard let superview = self.superview else {            print("Error! `superview` was nil – call `addSubview(view: UIView)` before calling `bindFrameToSuperviewBounds()` to fix this.")            return        }        self.translatesAutoresizingMaskIntoConstraints = false        superview.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|-0-[subview]-0-|", options: .DirectionLeadingToTrailing, metrics: nil, views: ["subview": self]))        superview.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:|-0-[subview]-0-|", options: .DirectionLeadingToTrailing, metrics: nil, views: ["subview": self]))    }}

Swift 3:

extension UIView {    /// Adds constraints to this `UIView` instances `superview` object to make sure this always has the same size as the superview.    /// Please note that this has no effect if its `superview` is `nil` – add this `UIView` instance as a subview before calling this.    func bindFrameToSuperviewBounds() {        guard let superview = self.superview else {            print("Error! `superview` was nil – call `addSubview(view: UIView)` before calling `bindFrameToSuperviewBounds()` to fix this.")            return        }        self.translatesAutoresizingMaskIntoConstraints = false        superview.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|-0-[subview]-0-|", options: .directionLeadingToTrailing, metrics: nil, views: ["subview": self]))        superview.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|-0-[subview]-0-|", options: .directionLeadingToTrailing, metrics: nil, views: ["subview": self]))    }}

Swift 4.2:

extension UIView {    /// Adds constraints to this `UIView` instances `superview` object to make sure this always has the same size as the superview.    /// Please note that this has no effect if its `superview` is `nil` – add this `UIView` instance as a subview before calling this.    func bindFrameToSuperviewBounds() {        guard let superview = self.superview else {            print("Error! `superview` was nil – call `addSubview(view: UIView)` before calling `bindFrameToSuperviewBounds()` to fix this.")            return        }        self.translatesAutoresizingMaskIntoConstraints = false        self.topAnchor.constraint(equalTo: superview.topAnchor, constant: 0).isActive = true        self.bottomAnchor.constraint(equalTo: superview.bottomAnchor, constant: 0).isActive = true        self.leadingAnchor.constraint(equalTo: superview.leadingAnchor, constant: 0).isActive = true        self.trailingAnchor.constraint(equalTo: superview.trailingAnchor, constant: 0).isActive = true    }}

Then simply call it like this:

// after adding as a subview, e.g. `view.addSubview(subview)`subview.bindFrameToSuperviewBounds()

I'm not sure if this is the most efficient way to do it, but it works..

UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];button.translatesAutoresizingMaskIntoConstraints = NO;// initialize[coverForScrolView addSubview:button];NSLayoutConstraint *width =[NSLayoutConstraint                                    constraintWithItem:button                                    attribute:NSLayoutAttributeWidth                                    relatedBy:0                                    toItem:coverForScrolView                                    attribute:NSLayoutAttributeWidth                                    multiplier:1.0                                    constant:0];NSLayoutConstraint *height =[NSLayoutConstraint                                     constraintWithItem:button                                     attribute:NSLayoutAttributeHeight                                     relatedBy:0                                     toItem:coverForScrolView                                     attribute:NSLayoutAttributeHeight                                     multiplier:1.0                                     constant:0];NSLayoutConstraint *top = [NSLayoutConstraint                                   constraintWithItem:button                                   attribute:NSLayoutAttributeTop                                   relatedBy:NSLayoutRelationEqual                                   toItem:coverForScrolView                                   attribute:NSLayoutAttributeTop                                   multiplier:1.0f                                   constant:0.f];NSLayoutConstraint *leading = [NSLayoutConstraint                                       constraintWithItem:button                                       attribute:NSLayoutAttributeLeading                                       relatedBy:NSLayoutRelationEqual                                       toItem:coverForScrolView                                       attribute:NSLayoutAttributeLeading                                       multiplier:1.0f                                       constant:0.f];[coverForScrolView addConstraint:width];[coverForScrolView addConstraint:height];[coverForScrolView addConstraint:top];[coverForScrolView addConstraint:leading];

This link can help you,follow the instructions : http://www.raywenderlich.com/20881/beginning-auto-layout-part-1-of-2

EDIT :

use following code snippet, where subview is your subivew.

[subview setTranslatesAutoresizingMaskIntoConstraints:NO];[self.view addConstraints:[NSLayoutConstraint                           constraintsWithVisualFormat:@"H:|-0-[subview]-0-|"                           options:NSLayoutFormatDirectionLeadingToTrailing                           metrics:nil                           views:NSDictionaryOfVariableBindings(subview)]];[self.view addConstraints:[NSLayoutConstraint                           constraintsWithVisualFormat:@"V:|-0-[subview]-0-|"                           options:NSLayoutFormatDirectionLeadingToTrailing                           metrics:nil                           views:NSDictionaryOfVariableBindings(subview)]];