UIView+Constraints.m

#include "UIView+Constraints.h"

@implementation UIView (fconstraints)
- (void)atlas_anchorTop:(NSLayoutAnchor<NSLayoutYAxisAnchor *> *)top
                leading:(NSLayoutAnchor<NSLayoutXAxisAnchor *> *)leading
                 bottom:(NSLayoutAnchor<NSLayoutYAxisAnchor *> *)bottom
               trailing:(NSLayoutAnchor<NSLayoutXAxisAnchor *> *)trailing
                padding:(UIEdgeInsets)insets
                   size:(CGSize)size {

  self.translatesAutoresizingMaskIntoConstraints = NO;

  if (top != nil) {
    [self.topAnchor constraintEqualToAnchor:top constant:insets.top].active =
        YES;
  }

  if (leading != nil) {
    [self.leadingAnchor constraintEqualToAnchor:leading constant:insets.left]
        .active = YES;
  }

  if (bottom != nil) {
    [self.bottomAnchor constraintEqualToAnchor:bottom constant:-insets.bottom]
        .active = YES;
  }

  if (trailing != nil) {
    [self.trailingAnchor constraintEqualToAnchor:trailing
                                        constant:-insets.right]
        .active = YES;
  }

  if (size.width != 0) {
    [self.widthAnchor constraintEqualToConstant:size.width].active = YES;
  }

  if (size.height != 0) {
    [self.heightAnchor constraintEqualToConstant:size.height].active = YES;
  }
}

- (void)atlas_anchorSizeToView:(UIView *)view {
  [self.widthAnchor constraintEqualToAnchor:view.widthAnchor].active = YES;
  [self.heightAnchor constraintEqualToAnchor:view.heightAnchor].active = YES;
}

- (void)atlas_centerInView:(UIView *)view {
  [self.centerYAnchor constraintEqualToAnchor:view.centerYAnchor].active = YES;
  [self.centerXAnchor constraintEqualToAnchor:view.centerXAnchor].active = YES;
}

- (void)atlas_heightWidthAnchorsEqualToSize:(CGSize)size {
  if (size.width != 0) {
    [self.widthAnchor constraintEqualToConstant:size.width].active = YES;
  }

  if (size.height != 0) {
    [self.heightAnchor constraintEqualToConstant:size.height].active = YES;
  }
}

- (void)atlas_fillSuperview {
  [self atlas_anchorTop:self.superview.topAnchor
                leading:self.superview.leadingAnchor
                 bottom:self.superview.bottomAnchor
               trailing:self.superview.trailingAnchor
                padding:UIEdgeInsetsZero
                   size:CGSizeZero];
}

@end