Wavelet says Swift third season building UI component set for Swift UI-View set (vi) Picker View View Learn notes

To operate on Pickerview, you can only operate in code.

Next, add three label components, then configure all the components into code (see Code), and then to implement the operation of Pickerview, it is necessary to implement its DataSource protocol and his agent, on the right side of the component's link bar, outlets has two options, Link them all to the controller:

OK, where does our data come from?

We define several arrays in the controller of the Code, and manually add the protocol, and then we will prompt viewcontroller not to obey the protocol Uipickerviewdatasource, because we have not implemented:

Here's how to implement the protocol:

There are also pickerview that can be rolled up, but this is an advanced part.

Wavelet says Swift third season building UI component set for Swift UI-View set (vi) Picker View View Learn notes