Programatic Constraints

ProgramaticConstraints.m

- (void)setProgramaticConstraints {
    self.myView = [UIView new];
    self.myView.translatesAutoresizingMaskIntoConstraints = NO;
    [self.myView setBackgroundColor:COLOR_WHITE_SMOKE];
    [self.view addSubview:self.myView];

    [self.myView addConstraint:[NSLayoutConstraint constraintWithItem:self.myView
                                                                      attribute:NSLayoutAttributeHeight
                                                                      relatedBy:NSLayoutRelationEqual
                                                                         toItem:nil
                                                                      attribute:NSLayoutAttributeNotAnAttribute
                                                                     multiplier:1.0
                                                                       constant:1.0f]];

    NSLayoutConstraint *myViewTopConstraint = [NSLayoutConstraint
                                                         constraintWithItem:self.myView attribute:NSLayoutAttributeTop
                                                         relatedBy:NSLayoutRelationEqual toItem:self.view
                                                         attribute:NSLayoutAttributeBottom multiplier:1.0 constant:0.0f];

    NSLayoutConstraint *myViewBottomConstraint = [NSLayoutConstraint
                                                         constraintWithItem:self.myView attribute:NSLayoutAttributeBottom
                                                         relatedBy:NSLayoutRelationEqual toItem:self.view
                                                         attribute:NSLayoutAttributeBottom multiplier:1.0 constant:0.0f];

    NSLayoutConstraint *myViewLeadingConstraint = [NSLayoutConstraint
                                                          constraintWithItem:self.myView attribute:NSLayoutAttributeLeading
                                                          relatedBy:NSLayoutRelationEqual toItem:self.view
                                                          attribute:NSLayoutAttributeLeading multiplier:1.0 constant:0.0f];

    NSLayoutConstraint *myViewTrailingConstraint = [NSLayoutConstraint
                                                           constraintWithItem:self.myView attribute:NSLayoutAttributeTrailing
                                                           relatedBy:NSLayoutRelationEqual toItem:self.view
                                                           attribute:NSLayoutAttributeTrailing multiplier:1.0 constant:0.0f];


    [self.view addConstraints:@[myViewTopConstraint, myViewBottomConstraint, myViewLeadingConstraint, myViewTrailingConstraint]];
}