关于ios:swift53-UIScrollView-动态计算-contentSize

UIScrollView 的非凡之处就在于当它遇到了AutoLayout之后其contentSize 的计算规定有些非凡。
contentSize是依据子视图的leading/trailing/top/bottom进行确定的

所以防止咱们手动去设置 contentSize，咱们必须投合它的规定去设置

间接上代码

       let scrollView = UIScrollView()                scrollView.backgroundColor = .gray        view.addSubview(scrollView)        scrollView.snp.makeConstraints { (make) in            make.edges.equalToSuperview()        }        let containerView = UIView()        containerView.backgroundColor = .blue        scrollView.addSubview(containerView)        containerView.snp.makeConstraints { (make) in            make.edges.equalToSuperview()            make.width.equalToSuperview()        }                let view1 = UIView()        view1.backgroundColor = .orange                let view2 = UIView()        view2.backgroundColor = .blue                        containerView.addSubview(view1)        containerView.addSubview(view2)                view1.snp.makeConstraints { (make) in            make.top.equalToSuperview()            make.width.equalToSuperview()            make.height.equalTo(500)        }                view2.snp.makeConstraints { (make) in            make.top.equalTo(view1.snp.bottom)            make.bottom.equalTo(containerView.snp.bottom)            make.leading.trailing.equalTo(containerView)            make.width.equalToSuperview()            make.height.equalTo(500)        }

大略就是这意思，咱们通过一个填满的 containerView 去设置子视图，同时咱们最初一个 subview 的 bottom 肯定要与 containerView 对齐即可