Swift Xib加载方式

0.新建加载工具类 NibLoadable.swift

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import UIKit

// 协议
protocol NibLoadable {
    // 具体实现写到extension内
}

// 加载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（点击文件名会自动将名字补全）

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3.将xib与类名进行关联

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4.在DemoView中遵循NibLoadable协议

import UIKit

class DemoView: UIView, NibLoadable {
    // 可自定义属性    
    var name : String = ""
}

5.然后就可以疯狂的搞事情了

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        // 加载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"
    }

}