IOS基础控件 Layer swift3.1

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//
// ViewController.swift
// Layer
//
// Created by hong wang on 2017/6/2.
// Copyright © 2017年 appio. All rights reserved.
//

import UIKit

class ViewController: UIViewController {

override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
//Layer Deomo 使用Button
let btn:UIButton = UIButton(type: .system)
btn.frame = CGRect(x: 10, y: 50, width: 70, height: 30)
btn.setTitle("按钮", for: .normal)
btn.setTitleColor(UIColor.blue, for: .normal)
btn.backgroundColor = UIColor.white
//设置圆边
//btn.layer.masksToBounds = true
btn.layer.cornerRadius = 6

//设置边框
btn.layer.borderWidth = 2
btn.layer.borderColor = UIColor.blue.cgColor

//设置阴影
btn.layer.shadowColor = UIColor.purple.cgColor
btn.layer.shadowOffset = CGSize(width: 2, height: 2)
btn.layer.shadowOpacity = 0.4

self.view.addSubview( btn )
btn.addTarget(self, action: #selector(ViewController.btnClick), for: UIControlEvents.touchUpInside)
}

override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.

}

func btnClick(){
print( "Btn Clicked!")
}

}