RubyMotion错误

Question

我刚刚开始学习红宝石运动，在一个教程的开始，我遇到了一个路障！本教程是"RubyMotion iOS开发要点“。

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，但显然这是RubyMotion语法.奇怪，我知道。下面是我收到的关于"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:'

‘

我很感激你的指点，这么早就被困在这里真是太令人沮丧了！

Answer 1

cancelButtonTitles应该是单数：cancelButtonTitle。

因为你使用复数的措辞，所以它找不到匹配的方法签名。