一：创建自己的ViewController视图
1.是否改变跟视图
let VC = TestViewContorller()
letnavVC =UINavigationController(rootViewController: VC)
self.window?.rootViewController= navVC
2.像这样的先做一个，方便我们调节位置
let SCR_W = UIScreen.main.bounds.size.width
let SCR_H = UIScreen.main.bounds.size.height
3.根据自己的喜好来创建，就做一个简单的登录界面吧
（1）在ViewDidLoad里
self.view.backgroundColor = UIColor.gray
//左侧按钮
letLeftBtn =UIButton(frame:CGRect(x:0, y:0, width:50, height:50))
LeftBtn.setImage(UIImage(named:"返回箭头"), for: .normal)
letleftItem =UIBarButtonItem(customView: LeftBtn)
self.navigationItem.leftBarButtonItem = leftItem
//导航条标题
self.navigationItem.title = "导航条文字"
layout()
（2）实现上面的方法
funclayout() ->Void{
//头像框
letImgV =UIImageView(image:UIImage(named:"头像照片"))
ImgV.frame=CGRect(x: (SCR_W-120)/2, y:150, width:120, height:120)
ImgV.layer.cornerRadius = 60
ImgV.layer.masksToBounds = true
self.view.addSubview(ImgV)
//登录框背景
letvLogin =UIView(frame:CGRect(x:0, y:300, width:SCR_W, height:180))
vLogin.layer.borderWidth=0.5
vLogin.layer.borderColor = UIColor.lightGray.cgColor
vLogin.backgroundColor = UIColor.white
self.view.addSubview(vLogin)
//用户输入框
lettxtUser =UITextField(frame:CGRect(x:0, y:0, width:SCR_W, height:60))
txtUser.placeholder=" 请输入账号"
txtUser.layer.borderWidth=0.5
txtUser.leftView=UIView(frame:CGRect(x:0, y:0, width:80, height:60))
txtUser.leftViewMode = UITextFieldViewMode.always
//用户名输入框左侧图标
letaccountBtn =UIButton()
accountBtn.frame=CGRect(x:0, y:0, width:80, height:60)
accountBtn.setImage(UIImage(named:"账号"), for: .normal)
accountBtn.alpha=0.7
accountBtn.setTitle(" 账号 | ", for: .normal)
accountBtn.setTitleColor(UIColor.black, for: .normal)
txtUser.leftView?.addSubview(accountBtn)
vLogin.addSubview(txtUser)
//用户密码框
lettxtPassWord =UITextField(frame:CGRect(x:0, y:60, width:SCR_W, height:60))
txtPassWord.placeholder="请输入密码"
txtPassWord.layer.borderWidth=0.5
txtPassWord.leftView=UIView(frame:CGRect(x:0, y:60, width:80, height:60))
txtPassWord.leftViewMode = UITextFieldViewMode.always
//密码输入框左侧图标
letpasswordBtn =UIButton()
passwordBtn.frame=CGRect(x:0, y:0, width:80, height:60)
passwordBtn.setImage(UIImage(named:"锁"), for: .normal)
passwordBtn.alpha=0.7
passwordBtn.setTitle(" 密码 | ", for: .normal)
passwordBtn.setTitleColor(UIColor.black, for: .normal)
txtPassWord.leftView?.addSubview(passwordBtn)
vLogin.addSubview(txtPassWord)
//确认用户密码框
lettxtConfirmPW =UITextField(frame:CGRect(x:0, y:120, width:SCR_W, height:60))
txtConfirmPW.placeholder="请再次输入密码"
txtConfirmPW.layer.borderWidth=0.5
txtConfirmPW.leftView=UIView(frame:CGRect(x:0, y:120, width:80, height:60))
txtConfirmPW.leftViewMode = UITextFieldViewMode.always
//确认密码图标
letConfirmPWBtn =UIButton()
ConfirmPWBtn.frame=CGRect(x:0, y:0, width:80, height:60)
ConfirmPWBtn.setImage(UIImage(named:"锁"), for: .normal)
ConfirmPWBtn.alpha=0.7
ConfirmPWBtn.setTitle(" 密码 | ", for: .normal)
ConfirmPWBtn.setTitleColor(UIColor.black, for: .normal)
txtConfirmPW.leftView?.addSubview(ConfirmPWBtn)
vLogin.addSubview(txtConfirmPW)
//注册按钮
letRegistered =UIButton(frame:CGRect(x: (SCR_W-350)/2, y:500, width:350, height:55))
Registered.setTitle("注册", for:.normal)
Registered.backgroundColor=UIColor(red: (0/255.0), green: (193/255.0), blue: (255/255.0), alpha:1.0)
Registered.layer.cornerRadius=5
Registered.layer.masksToBounds=true
Registered.addTarget(self, action:#selector(click), for: .touchUpInside)
self.view.addSubview(Registered)
//判断是否为有的账号
letuserLab =UILabel(frame:CGRect(x:270, y:570, width:80, height:32))
userLab.text="？"
userLab.font=UIFont.systemFont(ofSize:15)
userLab.textColor=UIColor.lightGray
self.view.addSubview(userLab)
letuserBtn =UIButton(frame:CGRect(x:350, y:575, width:50, height:20))
userBtn.setImage(UIImage(named:"登录"), for: .normal)
userBtn.addTarget(self, action:#selector(login), for: .touchUpInside)
self.view.addSubview(userBtn)
}
（3）实现我们上面的点击方法
@objcfuncclick() ->Void{
let NetWork = NetworkViewController()
self.navigationController?.pushViewController(NetWork, animated:true)
letitem =UIBarButtonItem(title:"", style: .plain, target:self, action:nil)
self.navigationItem.backBarButtonItem = item
}
（4）做好之后我们一定要判断此账号是否登录
@objcfunclogin() ->Void{
print("登录异地登录，请注意安全")
}
