swift-结构体

示例 struct 关键字

struct Location {
    
    let latitude: Double   // 可以给默认值 = 0
    let longitude: Double
}

let myHomeLocation = Location(latitude: 21, longitude: 33)

结构体之构造函数

第一种方式：
struct Location {
    let latitude: Double = 0
    let longitude: Double = 0
}

let myHomeLocation = Location() // 这里不需要传参 因为上面给了默认值

第二种方式：

struct Location {
    
    var latitude: Double
    var longitude: Double
    var point: (Double, Double)?
    
    init(latitude: Double, longitude: Double) {
        
        self.latitude = latitude
        
        self.longitude = longitude
    }
    
    init(latitude: Double, longitude: Double, point: (Double, Double)) {
        
        self.latitude = latitude
        
        self.longitude = longitude
        
        self.point = point
    }
    
}

// 调用构造函数
let myLocation = Location(latitude: 20, longitude: 30, point: (20, 30))

let myHomeLation = Location(latitude: 20, longitude: 30)