ios - RubyMotion 错误

Question

我刚开始学习 ruby​​ motion，在教程开始时我遇到了障碍!教程是《RubyMotion iOS 开发精要》。

这是我的代码:

class RootController < UIViewController
    def viewDidLoad
    alert = UIAlertView.alloc.initWithTitle "This is foo title",
    message:"Do you like this example?",
    delegate: nil,
    cancelButtonTitles: "cancel",
    otherButtonTitles: "Yes", "No", nil
    alert.show
    end
end

我知道缩进看起来很有趣，但显然那是 RubyMotion 语法……很奇怪，我知道。这是我收到的关于“initWithTitle”方法的错误:

(main)> 2013-12-13 00:44:40.780 HelloWorld[97435:80b] root_controller.rb:7:in `viewDidLoad': undefined method `initWithTitle' for #<UIAlertView:0x8d2bcf0> (NoMethodError)
    from app_delegate.rb:6:in `application:didFinishLaunchingWithOptions:'
2013-12-13 00:44:40.782 HelloWorld[97435:80b] root_controller.rb:7:in `viewDidLoad': undefined method `initWithTitle' for #<UIAlertView:0x8d2bcf0> (NoMethodError)
    from app_delegate.rb:6:in `application:didFinishLaunchingWithOptions:'
2013-12-13 00:44:40.784 HelloWorld[97435:80b] *** Terminating app due to uncaught exception 'NoMethodError', reason: 'root_controller.rb:7:in `viewDidLoad': undefined method `initWithTitle' for #<UIAlertView:0x8d2bcf0> (NoMethodError)
    from app_delegate.rb:6:in `application:didFinishLaunchingWithOptions:'

'

如果有任何指点，我将不胜感激，这么早就陷入困境真是太可惜了!

Answer 1

cancelButtonTitles 应该是单数:cancelButtonTitle。

因为您使用的是复数措辞，所以找不到匹配的方法签名。