小编Rid*_*wan的帖子

每当我构建以下代码时,我都会收到上面的错误.

//Controller.h
#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>
#import "PolygonShape.h"
#import "PolygonView.h";

@interface Controller : NSObject
{
    IBOutlet UIButton *decreaseButton;
    IBOutlet UIButton *increaseButton;
    IBOutlet UILabel *numberOfSidesLabel;
    IBOutlet PolygonShape *shape;
    IBOutlet PolygonView *shapeView;
}
- (IBAction)decrease;
- (IBAction)increase;
- (void)awakeFromNib;
@end


//Controller.m
#import "Controller.h"


@implementation Controller
@end    

但是,当我替换import语句并改为使用前向类引用时,代码将编译.

//Controller.h

#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>
#import "PolygonShape.h"
@class PolygonView;

@interface Controller : NSObject
{
    IBOutlet UIButton *decreaseButton;
    IBOutlet UIButton *increaseButton;
    IBOutlet UILabel *numberOfSidesLabel;
    IBOutlet PolygonShape *shape;
    IBOutlet PolygonView *shapeView;
}
- (IBAction)decrease;
- (IBAction)increase;
- …

当我尝试运行rspec测试时,我收到以下错误:

/srv/offerme/spec/requests/static_pages_spec.rb:13: undefined method `visit' for #<Class:0xb3436684> (NoMethodError)
from /var/lib/gems/1.8/gems/rspec-core-2.11.1/lib/rspec/core/example_group.rb:238:in `module_eval'
from /var/lib/gems/1.8/gems/rspec-core-2.11.1/lib/rspec/core/example_group.rb:238:in `subclass'
from /var/lib/gems/1.8/gems/rspec-core-2.11.1/lib/rspec/core/example_group.rb:224:in `describe'
from /srv/offerme/spec/requests/static_pages_spec.rb:12
from /var/lib/gems/1.8/gems/rspec-core-2.11.1/lib/rspec/core/example_group.rb:238:in `module_eval'
from /var/lib/gems/1.8/gems/rspec-core-2.11.1/lib/rspec/core/example_group.rb:238:in `subclass'
from /var/lib/gems/1.8/gems/rspec-core-2.11.1/lib/rspec/core/example_group.rb:224:in `describe'
from /var/lib/gems/1.8/gems/rspec-core-2.11.1/lib/rspec/core/dsl.rb:18:in `describe'
from /srv/offerme/spec/requests/static_pages_spec.rb:3
from /var/lib/gems/1.8/gems/rspec-core-2.11.1/lib/rspec/core/configuration.rb:780:in `load'
from /var/lib/gems/1.8/gems/rspec-core-2.11.1/lib/rspec/core/configuration.rb:780:in `load_spec_files'
from /var/lib/gems/1.8/gems/rspec-core-2.11.1/lib/rspec/core/configuration.rb:780:in `map'
from /var/lib/gems/1.8/gems/rspec-core-2.11.1/lib/rspec/core/configuration.rb:780:in `load_spec_files'
from /var/lib/gems/1.8/gems/rspec-core-2.11.1/lib/rspec/core/command_line.rb:22:in `run'
from /var/lib/gems/1.8/gems/rspec-core-2.11.1/lib/rspec/core/runner.rb:69:in `run'
from /var/lib/gems/1.8/gems/rspec-core-2.11.1/lib/rspec/core/runner.rb:8:in `autorun'
from /usr/local/bin/rspec:19

我收到此错误的文件如下所示(spec/requests/static_pages_spec.rb):

require 'spec_helper'

describe "StaticPages" do
include Capybara::DSL
  describe "GET /static_pages" do
    it "works! (now write some real specs)" do
      # Run the generator …

似乎我的代码永远不会通过switch语句运行.每次我创建一个Deck对象时,每个Card对象的套装和名称都是nil.谁能帮我吗？

class Card
def initialize (suit, number, name)
    @suit = suit
    @number = number
    @name = name         #
end
attr_reader :suit, :number, :name
end

class Deck
      def initialize
          @deck = Array.new
          for i in 0...4
              suit = case i
                  when i == 0 then "Spades"
                  when i == 1 then "Hearts"
                  when i == 2 then "Diamonds"
                  when i == 3 then "Clubs"
              end
          puts i
          puts suit     #Debug only
          for j in 2...15
              name = case j
                  when j …

我收到了一个Uncaught SyntaxError:这段代码的第一行出现了意外的标识符.我是JavaScript的新手,所以它可能非常简单,我很想念.

chrome.tabs.getSelected(function(Tab tab) {
    var url = tab.url;
    console.log(url);
});
console.log("test");