Swift 【利用 泛型 便利 xib 的加载过程】

//
//  UIView+Extension.swift
//  BasicSwift
//
//  Created by 王中尧 on 2017/11/28.
//  Copyright © 2017年 hc. All rights reserved.
//

import UIKit

/// 加载 UIView 类型的 xib
func loadNib<T>(_ as: T.Type) -> T where T: UIView {
    return Bundle.main.loadNibNamed("\(T.self)", owner: nil, options: nil)?.first as! T
}

/// 加载 UIView 类型的 xib（并设置 frame 参数）
func loadNib<T>(_ as: T.Type, frame: CGRect) -> T where T: UIView {
    let TView = loadNib(`as`)
    TView.frame = frame
    return TView
}

//
//  HomeViewController.swift
//  BasicSwift
//
//  Created by CoderZYWang on 2017/11/27.
//  Copyright © 2017年 hc. All rights reserved.
//

import UIKit

class HomeViewController: UIViewController {
    override func viewDidLoad() {
        setUpUI()
    }
}

extension HomeViewController {
    func setUpUI() {
        view.backgroundColor = UIColor(hex: "FF5A39", alpha: 0.5)

        let laolaoView = loadNib(LaoLaoView.self, frame: CGRect(x: 20, y: 220, width: 300, height: 150))
        view.addSubview(laolaoView)

        let laolaoView02 = loadNib(LaoLaoView.self)
        view.addSubview(laolaoView02)
        laolaoView02.frame = CGRect(x: 20, y: 400, width: 200, height: 120)
    }
}