ios - 如何只显示一次登录屏幕？
<p><p>当用户首次打开应用程序时，我会显示登录屏幕。用户成功登录后，我在 <code>NSUserDefaults</code> 中存储了一个 sessionID。然后下次用户打开应用程序时，我检查是否设置了 sessionID。如果已设置，那么我不想显示登录屏幕。 </p>
<p>所以第一次我想显示 main_controller，但是当用户在成功登录后第二次打开应用程序时，我想显示 <code>test_controller.rb</code>。 </p>
<p><strong>问题</strong></p>
<p>我应该在哪里控制这个流程？</p>
<p>我不确定如何在第二次打开应用程序时检查 sessionID。 </p>
<p>这是我的
app_delegate.rb</p>
<pre><code>class AppDelegate
attr_reader :window
def application(application, didFinishLaunchingWithOptions:launchOptions)
@window = UIWindow.alloc.initWithFrame(UIScreen.mainScreen.bounds)
main_controller = MainController.alloc.initWithNibName(nil, bundle: nil)
@window.rootViewController = UINavigationController.alloc.initWithRootViewController(main_controller)
@window.makeKeyAndVisible
true
end
end
</code></pre>
<p>main_controller.rb</p>
<pre><code>class MainController < UIViewController
def viewDidLoad
super
self.edgesForExtendedLayout = UIRectEdgeNone
rmq.stylesheet = MainStylesheet
init_nav
rmq(self.view).apply_style :root_view
@username = rmq.append(UITextField, :username).focus.get
@password = rmq.append(UITextField, :password).focus.get
@sessionId = NSUserDefaults.standardUserDefaults
puts @sessionId["sessionId"]
if @sessionId["sessionId"] == nil
rmq.append(UIButton, :submit_button).on(:touch) do |sender|
puts "pressed #{@username.text} #{@password.text}"
login_user (@username.text, @password.text)
end
end
end
def login_user(uname, pwd)
client = AFMotion::Client.build("http://localhost:9000/") do
header "Accept", "application/json"
header "Content-Type", "application/json"
request_serializer :json
response_serializer :json
end
client.post("user/signup", username: uname, password: pwd) do |result|
@sessionId["sessionId"] = result.object["sessionId"]
end
end
def init_nav
self.title = "Main"
end
end
</code></pre>
<p>最后是 <code>test_controller.rb</code></p>
<pre><code>class TestController < UIViewController
def viewDidLoad
super
# Sets a top of 0 to be below the navigation control
self.edgesForExtendedLayout = UIRectEdgeNone
rmq.stylesheet = MainStylesheet
init_nav
rmq(self.view).apply_style :root_view
end
def init_nav
self.title = "TEST"
end
end
</code></pre></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>我认为您可以使用类似这样的某种辅助类</p>
<h3>AuthManager.rb</h3>
<pre><code>class AuthManager
attr_accessor :sessionId
def self.instance
Dispatch.once { @instance ||= new}
@instance
end
def init
@keychain = KeychainItemWrapper.alloc.initWithIdentifier('EthanApp', accessGroup: nil)
self.sessionId = @keychain.objectForKey KSecAttrAccount
end
def need_login?
return (self.sessionId.nil? || self.sessionId.empty?)
end
def login(username, password)
client = AFMotion::Client.build('http://localhost:9000/') do
header 'Accept', 'application/json'
header 'Content-Type', 'application/json'
request_serializer :json
response_serializer :json
end
client.post('user/signup', username: uname, password: pwd) do |result|
ap result
ap result.object
if result.success?
@keychain.setObject result.object[:sessionId], forKey: KSecAttrAccount
else
App.alert('login failed: invalid username and/or password')
end
end
end
def logout
@keychain.setObject nil, forKey: KSecAttrAccount
end
end
</code></pre>
<h3>将此添加到您的 app_delegate.rb</h3>
<pre><code>AuthManager.instance.init # initialize singleton object
</code></pre>
<h3>main_controller.rb</h3>
<pre><code># You can control your login screen by call this method
if AuthManager.instance.need_login?
rmq.append(UIButton, :submit_button).on(:touch) do |sender|
AuthManager.instance.login(username, password)
end
else
# Display TestController
end
</code></pre></p>
<p style="font-size: 20px;">关于ios - 如何只显示一次登录屏幕？，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/22461836/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/22461836/
</a>
</p>
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