Swift3.0 - 文本输出
- 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)
}
}举报
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