用面向協(xié)議加載xib

• 創(chuàng)建一個(gè)協(xié)議類(lèi)NibLoadable

import UIKit
protocol NibLoadable {

}
extension NibLoadable where Self : UIView {
    static func loadFromNib(_ nibname : String? = nil) -> Self {
        let loadName = nibname == nil ? "\(self)" : nibname!
        return Bundle.main.loadNibNamed(loadName, owner: nil, options: nil)?.first as! Self
    }
}

• 假如HintCoverView從xib那邊加載那么只需要遵守NibLoadable協(xié)議

class HintCoverView: UIView,NibLoadable{
}

• 調(diào)用時(shí)候：

lazy var hintCoverView : HintCoverView = {
        let hintCoverView = HintCoverView.loadFromNib()
        return hintCoverView
    }()

這就是面向協(xié)議開(kāi)發(fā)桶错，誰(shuí)需要這個(gè)功能就遵守這個(gè)協(xié)議敞斋，其開(kāi)發(fā)核心是: 模塊化(組件化)扁耐，比如寫(xiě)一個(gè)振動(dòng)的動(dòng)畫(huà)協(xié)議，如果當(dāng)UITextField文本驗(yàn)證錯(cuò)誤時(shí)候需要振動(dòng)，那么就繼承這個(gè)協(xié)議寻馏，如果除了振動(dòng)還需要旋轉(zhuǎn)兆龙，那么可再寫(xiě)一個(gè)旋轉(zhuǎn)協(xié)議去繼承。這就是他功能強(qiáng)大之處耻台。

面向協(xié)議進(jìn)行網(wǎng)絡(luò)請(qǐng)求

import Foundation
protocol Requestable {
    var method : HttpMethod { get }
    var URLString : String { get }
   
    associatedtype ResultType : Decodable
}

extension Requestable {
    func request(completion : @escaping (ResultType?) -> Void) {
        // 1.創(chuàng)建URL
        let url = URL(string: URLString)!
        
        // 2.創(chuàng)建request對(duì)象
        let request = URLRequest(url: url)
        
        // 3.通過(guò)URLSession發(fā)送請(qǐng)求
        let task = URLSession.shared.dataTask(with: request, completionHandler: { (data, _, error) in
       // 通過(guò)Decodable協(xié)議得到data數(shù)據(jù)空免，手動(dòng)調(diào)用ResultType的parse：方法獲得解析后的數(shù)據(jù)
            completion(ResultType.parse(data!))
        })
        
        // 4.發(fā)起請(qǐng)求
        task.resume()
    }
}
// 解析數(shù)據(jù)協(xié)議
protocol Decodable {
    static func parse(_ data : Data) -> Self?
}

• 假如有一個(gè)用戶信息請(qǐng)求:UserRequest，通過(guò)Requestable協(xié)議就會(huì)將里面參數(shù)傳進(jìn)去再去調(diào)用請(qǐng)求的方法

class UserRequest : Requestable {
    var method: HttpMethod = .GET
    var URLString : String = "http://www.baidu.com"
    typealias ResultType = User
}

• 用戶模型解析

import UIKit
struct User {
    var name : String = "aaa"
    var message : String = "bbb"
    
    init?(data : Data) {
        guard let dictT = try? JSONSerialization.jsonObject(with: data, options: .mutableContainers) as? [String : Any] else {
            return nil
        }
        
        let dict = dictT?["args"] as? [String : Any]
        
        guard let name = dict?["username"] as? String else {
            return nil
        }        
        guard let message = dict?["age"] as? String else {
            return nil
        }        
        self.name = name
        self.message = message
    }
}
// User（ResultType）的parse：方法進(jìn)行數(shù)據(jù)解析
extension User : Decodable {
    static func parse(_ data: Data) -> User? {
        return User(data: data)
    }
}

• 調(diào)用：

import UIKit
class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        UserRequest().request { (user : User?) in
            if let user = user {
                print(user.name, user.message)
            }
        }
    }
}