Swift 纯代码自定义简单UIView

自定义其他控件类方法也类似

import UIKit

let SCREEN_WIDTH = UIScreen.mainScreen().bounds.size.width
let SCREEN_HEIGHT = UIScreen.mainScreen().bounds.size.height

class MyView: UIView {
    //1 声明变量
    var myImageView: UIImageView?
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        
        //2 初始化视图
        myImageView = UIImageView(frame: CGRect(x: SCREEN_WIDTH/2 - 87.5, y: SCREEN_HEIGHT/2 - 180, width: 175, height: 256))
        self.addSubview(myImageView!)
    }
    
    //3 增加设置图片方法
    func addImage(image: UIImage) {
        myImageView?.image = image
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

使用

        let yourView = MyView() //按照图纸要求征块地
        yourView.addImage(UIImage(named: "imageName")!) //设置图片