Swift3.0 - 真的很简单
Swift3.0 - 数据类型
Swift3.0 - Array
Swift3.0 - 字典
Swift3.0 - 可选值
Swift3.0 - 集合
Swift3.0 - 流控制
Swift3.0 - 对象和类
Swift3.0 - 属性
Swift3.0 - 函数和闭包
Swift3.0 - 初始化和释放
Swift3.0 - 协议protocol
Swift3.0 - 类和结构体的区别
Swift3.0 - 枚举
Swift3.0 - 扩展
Swift3.0 - 下标
Swift3.0 - 泛型
Swift3.0 - 异常错误
Swift3.0 - 断言
Swift3.0 - 自动引用计数(strong,weak,unowned)
Swift3.0 - 检测API
Swift3.0 - 对象的标识
Swift3.0 - 注释
Swift3.0 - 元类型
Swift3.0 - 空间命名
Swift3.0 - 对象判等
Swift3.0 - 探究Self的用途
Swift3.0 - 类簇
Swift3.0 - 动态调用对象(实例)方法
Swift3.0 - 文本输出
Swift3.0 - 黑魔法swizzle
Swift3.0 - 镜像
Swift3.0 - 遇到的坑
- 文本方式输出对象
class Person:CustomStringConvertible {
var name: String
var age: Int
var weight:Double
init(name:String,age:Int,weight:Double) {
self.name = name
self.age = age
self.weight = weight
}
var description: String{
return name + String(age) + String(weight)
}
}
let person = Person(name: "酷走天涯", age: 25,weight:150.0)
// 获取对象文本
let des = String(describing: person)
print(des)
运行结果:
酷走天涯25150.0
提示:
让对象文本输出很简单，只要实现协议CustomStringConvertible 即可
思考: 下面的代码为什么不正确
class Person:NSObject,CustomStringConvertible {
var name: String
var age: Int
var weight:Double
init(name:String,age:Int,weight:Double) {
self.name = name
self.age = age
self.weight = weight
}
var description: String{
return name + String(age) + String(weight)
}
}
提示:
NSObject 里面已经实现了协议CustomStringConvertible,不能重复实现,我们只需要重写var description: String 即可
正确代码如下:
class Person:NSObject {
var name: String
var age: Int
var weight:Double
init(name:String,age:Int,weight:Double) {
self.name = name
self.age = age
self.weight = weight
}
override var description: String{
return name + String(age) + String(weight)
}
}