0.新建加載工具類 NibLoadable.swift

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import UIKit

// 協(xié)議
protocol NibLoadable {
    // 具體實現(xiàn)寫到extension內(nèi)
}

// 加載nib
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
    }
}

1.新建DemoView

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2.新建xib文件（點擊文件名會自動將名字補全）

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3.將xib與類名進行關(guān)聯(lián)

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4.在DemoView中遵循NibLoadable協(xié)議

import UIKit

class DemoView: UIView, NibLoadable {
    // 可自定義屬性    
    var name : String = ""
}

5.然后就可以瘋狂的搞事情了

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        // 加載demoview
        //方法一：
        let demoView = DemoView.loadFromNib()
        demoView.name = "why"
        view.addSubview(demoView)
        
        //方法二：
        let testView = TestView.loadFromNib("")
        testView.age = 10
        
        demoView.name = "why"
    }

}