UI basic principles

1 Responsibilities

1.1 UIViewController duties

UIView, event manager, responsible for creating dependency.

1.2 UIView duties

1. It is a sub-view event, CALayer managers.

2. Process layout.

2 layout

In most cases, it is AutoLayout 自上而下layout, the tree view, the parent node of setting constraints subviews.

So long as we know the roots of the frame can draw a tree view of the whole grain.

In some cases, the lower layout will affect the upper, such as automatic tableView estimates, the new circle of friends reply.

At this time, the tree view child nodes need to tell their parent node to re-calculate their own constraints, and refresh the layout.

3 code organization

3.1 For view

1. initWithFrame in

   Assembly subview

2. setModel in

   Configuration data source, needLayout

3. layoutSubview中

   Process layout

3.2 For viewController

1. init, only need to pass parameters when we come to need

   Do not appear self.view, only common property assignment (such as model, details page url, etc.)

2. In viewDidLoad

   Assembled subview

3. viewWilAppear in

   Processing of data related to the processing system-level tasks (such as statusbar, network monitoring, etc.)

4. viewDidLayoutSubviews中

   Process layout

5. subview initialization in the getter

6. Slimming

   ViewModel、RAC、category

4 common class hierarchy

5 Common practice

The loadingView other common unified operation, wrote a UIViewController's classification.

Reproduced in: https: //juejin.im/post/5d077fa0e51d45105d63a50a