通常Xib加载View的两种方法
let v = Bundle.main.loadNibNamed("OurCustomView", owner: nil, options: nil)?.first as! OurCustomView
或者是
let nib = UINib(nibName: "OurCustomView", bundle: nil)
let v = nib.instantiate(withOwner: nil, options: nil)[0] as! OurCustomView
一般一个项目可能多达几十个XIB甚至上百个，那么这样的重复代码是否可以精简一下呢？答案是肯定的
首先把这个重复的动作抽到一个协议中去，并在协议的extension中提供默认实现
代码如下
import Foundation
protocol NibloadProtocol {
}
extension NibloadProtocol where Self : UIView{
/*
static func loadNib(_ nibNmae :String = "") -> Self{
let nib = nibNmae == "" ? "\(self)" : nibNmae
return Bundle.main.loadNibNamed(nib, owner: nil, options: nil)?.first as! Self
}
*/
static func loadNib(_ nibNmae :String? = nil) -> Self{
return Bundle.main.loadNibNamed(nibNmae ?? "\(self)", owner: nil, options: nil)?.first as! Self
}
}
xib加载view从此变得如此简单
let v = OurCustomView.loadNib()
只需要继承该协议即可
原来：
class OurCustomView: UIView {
修改后：
class OurCustomView: UIView,NibloadProtocol {
使用：
let v = OurCustomView.loadNib()
