UIStackView的简单实用

UIstackView是一个很好的布局控件，废话不多说，下面是我写的一个简单的demo


   UIStackView *vstackView = [[UIStackView alloc]initWithFrame:CGRectMake(20, 30, 300, 300)];
    vstackView.axis = UILayoutConstraintAxisVertical;
    vstackView.distribution = UIStackViewDistributionFillEqually;
    vstackView.alignment = UIStackViewAlignmentFill;
    vstackView.spacing = 20;
    
    [self.view addSubview:vstackView];
    for (int a = 0; a<4; a++) {
        UIStackView *stackView = [[UIStackView alloc]init];
        
        stackView.axis = UILayoutConstraintAxisHorizontal;
        stackView.distribution = UIStackViewDistributionFillEqually;
        stackView.alignment  = UIStackViewAlignmentFill;
        stackView.spacing = 20;
         stackView.backgroundColor = [UIColor colorWithRed:arc4random()%255/255.0 green:arc4random()%255/255.0 blue:arc4random()%255/255.0 alpha:1];
        [vstackView addArrangedSubview:stackView];
       
        
        for (int i = 0; i<4; i++) {
            UILabel *view = [[UILabel alloc]init];
            view.backgroundColor = [UIColor colorWithRed:arc4random()%255/255.0 green:arc4random()%255/255.0 blue:arc4random()%255/255.0 alpha:1];
            view.textAlignment = NSTextAlignmentCenter;
            view.text = [NSString stringWithFormat:@"%d",i];
            [stackView addArrangedSubview:view];
        }
      
    }