摘要： override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view, typically from a nib. //获得一个应用实例，应用实例的核心作用是提供程序运行期间的控制和协作，每个程... 阅读全文

摘要： import UIKit class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view, typically from a nib. ... 阅读全文