MFViewController.m

//
//  MFViewController.m
//  MisterFusionSample
//
//  Created by 鈴木大貴 on 2015/11/14.
//  Copyright © 2015年 Taiki Suzuki. All rights reserved.
//

#import "MFViewController.h"
#import <MisterFusion/MisterFusion-Swift.h>

@interface MFViewController ()
@property (strong, nonatomic) UIView *greenView;
@property (strong, nonatomic) NSLayoutConstraint *greenViewBottomConstraint;

@property (strong, nonatomic) UIView *whiteView;
@property (strong, nonatomic) UIView *redView;
@property (strong, nonatomic) NSLayoutConstraint *whiteViewWidthConstraint;
@end

@implementation MFViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    UIView *redView = [UIView new];
    redView.backgroundColor = [UIColor redColor];
    redView.translatesAutoresizingMaskIntoConstraints = NO;
    [self.view addSubview: redView];
    //Ordinary AutoLayout code
    id toItem;
    if (@available(iOS 11.0, *)) {
        toItem = self.view.safeAreaLayoutGuide;
    } else {
        toItem = self.view;
    }
    [self.view addConstraints:@[
        [NSLayoutConstraint constraintWithItem:redView attribute:NSLayoutAttributeTop    relatedBy:NSLayoutRelationEqual toItem:toItem attribute:NSLayoutAttributeTop    multiplier:1.0f constant:10.0f],
        [NSLayoutConstraint constraintWithItem:redView attribute:NSLayoutAttributeRight  relatedBy:NSLayoutRelationEqual toItem:toItem attribute:NSLayoutAttributeRight  multiplier:1.0f constant:-10.0f],
        [NSLayoutConstraint constraintWithItem:redView attribute:NSLayoutAttributeLeft   relatedBy:NSLayoutRelationEqual toItem:toItem attribute:NSLayoutAttributeLeft   multiplier:1.0f constant:10.0f],
        [NSLayoutConstraint constraintWithItem:redView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:toItem attribute:NSLayoutAttributeHeight multiplier:0.5f constant:-15.0f]
    ]];
    self.redView = redView;
    
    UIView *yellowView = [UIView new];
    yellowView.backgroundColor = [UIColor yellowColor];
    yellowView.translatesAutoresizingMaskIntoConstraints = NO;
    [self.view addSubview:yellowView];
    //MisterFusion code
    [self.view addLayoutConstraints:@[
        yellowView.Top   .Equal(redView.Bottom)          .Constant(10.0f),
        yellowView.Right .Equal(self.view.SafeAreaRight) .Constant(-10.0f),
        yellowView.Left  .Equal(self.view.SafeAreaLeft)  .Constant(10.0f),
        yellowView.Height.Equal(self.view.SafeAreaHeight).Multiplier(0.5f).Constant(-15.0f)
    ]];
    
    UIView *greenView = [UIView new];
    greenView.backgroundColor = [UIColor greenColor];
    //Advanced MisterFusion code
    self.greenViewBottomConstraint = [yellowView addLayoutSubview:greenView andConstraints:@[
        greenView.Top,
        greenView.Right,
        greenView.Bottom,
        greenView.Width.Multiplier(0.5f)
    ]].FirstAttribute(NSLayoutAttributeBottom).firstObject;
    self.greenView = greenView;
    
    UIView *whiteView = [UIView new];
    whiteView.backgroundColor = [UIColor whiteColor];
    [redView addLayoutSubview:whiteView andConstraints:@[
         whiteView.Bottom.Constant(-10.0f),
         whiteView.Left.Constant(10.0f),
         whiteView.Height.NotRelatedEqualConstant(100.0f)
    ]];
    self.whiteView = whiteView;
}
    
- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
    [self reduceAnimation];
}
    
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (void)traitCollectionDidChange:(UITraitCollection *)previousTraitCollection {
    [self.redView removeConstraint:self.whiteViewWidthConstraint];
    self.whiteViewWidthConstraint = [self.redView addLayoutConstraints:@[
        self.whiteView.Width.Multiplier(0.5f).Constant(-10).VerticalSizeClass(UIUserInterfaceSizeClassRegular).HorizontalSizeClass(UIUserInterfaceSizeClassCompact),
        self.whiteView.Width.Constant(-20).VerticalSizeClass(UIUserInterfaceSizeClassCompact)
    ]].FirstAttribute(NSLayoutAttributeWidth).firstObject;
}
    
-(void)stretchAnmation {
    self.greenViewBottomConstraint.constant = 0.0f;
    [UIView animateWithDuration:2.0f animations:^{
        [self.greenView.superview layoutIfNeeded];
    } completion:^(BOOL finished) {
        [self reduceAnimation];
    }];
}
    
-(void)reduceAnimation {
    CGFloat constant = self.greenView.superview.frame.size.height;
    self.greenViewBottomConstraint.constant = -constant / 2.0f;
    [UIView animateWithDuration:2.0f animations:^{
        [self.greenView.superview layoutIfNeeded];
    } completion:^(BOOL finished) {
        [self stretchAnmation];
    }];
}
    
@end