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Contents.swift
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Contents.swift
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//: Playground - noun: a place where people can play
import UIKit
class SmartAirConditioner{
private var temperature: Int = 26
var temperatureChange: ((Int) -> ())!
// 使用强制解包 weak self
// init(){
// temperatureChange = { [weak self](newTemperature) in
// if abs(newTemperature - self!.temperature) >= 10{
// print("It's not healthy to do it!")
// }
// else{
// self!.temperature = newTemperature
// print("New temperature \(newTemperature) is set!")
// }
// }
// }
// 使用 if let `self` 解包 weak self
// init(){
// temperatureChange = { [weak self](newTemperature) in
// if let `self` = self{
// if abs(newTemperature - self.temperature) >= 10{
// print("It's not healthy to do it!")
// }
// else{
// self.temperature = newTemperature
// print("New temperature \(newTemperature) is set!")
// }
// }
// }
// }
// 使用 if let weakSelf(起一个新名字) 解包 weak self
// init(){
// temperatureChange = { [weak self](newTemperature) in
// if let weakSelf = self{
// if abs(newTemperature - weakSelf.temperature) >= 10{
// print("It's not healthy to do it!")
// }
// else{
// weakSelf.temperature = newTemperature
// print("New temperature \(newTemperature) is set!")
// }
// }
// }
// }
// 使用 unowned self
init(){
temperatureChange = { [unowned self]newTemperature in
if abs(newTemperature - self.temperature) >= 10{
print("It's not healthy to do it!")
}
else{
self.temperature = newTemperature
print("New temperature \(newTemperature) is set!")
}
}
}
deinit{
print("Smart Air-conditioner is being deinitialized!")
}
}
var airCon: SmartAirConditioner? = SmartAirConditioner()
airCon?.temperature
airCon?.temperatureChange(100)
airCon?.temperatureChange(24)
airCon = nil