参考原文：UIStackView学习分享， 纯代码实现

代码预览：

- (void)viewDidLoad {
    [super viewDidLoad];
    
    containerView = [[UIStackView alloc] initWithFrame:CGRectMake(0, 100, ScreenWidth, 200)];
    containerView.axis = UILayoutConstraintAxisHorizontal;
    containerView.distribution = UIStackViewDistributionFillEqually;
    containerView.spacing = 10;
    containerView.alignment = UIStackViewAlignmentFill;
    
    for (NSInteger i = 0; i < 4; i++) {
        UIView *view = [[UIView alloc] init];
        view.backgroundColor = [UIColor colorWithRed:random()%256/255.0 green:random()%256/255.0 blue:random()%256/255.0 alpha:1];
        [containerView addArrangedSubview:view];
    }
    
    [self.view addSubview:containerView];
}