第九节:结构体-sturt //: Playground - noun: a place where people can play import UIKit /* swift学习第九节 结构体:sturt */ let centerX = 100.0 let centerY = 100.0 let distance = 200.0 //定义结构体sturt struct Location { var x : Double = var y : Double = //结构体初始化 init (St…