objective-c - 命令/Developer/usr/bin/clang 失败，退出代码为 1

Question

我试图用 Xcode 制作一个简单的 Mac Objective-C 应用程序来记录两个玩简单游戏的玩家的分数，每个玩家最多 36 个分数。它不是一个非常实用的应用程序，因为它的功能有限，主要用于练习。我试图使用首选项窗口稍微扩展应用程序，单击菜单项时会弹出​​该窗口。

我创建了一个文件来控制 men 项目，然后在单击它时弹出一个 Nib 。所有这些工作正常，并且会弹出一个新窗口。我将 slider 、文本字段等放在 Nib 上，并将它们连接到 Action 。所有这些都运行良好。

当我试图将文件导入我的根 Controller 以便我可以在应用程序中使用用户的选择时，问题出现了。

我得到以下编译器错误:

Command /Developer/usr/bin/clang failed with exit code 1

连同所有这些:

Ld "/Users/myusername/Library/Developer/Xcode/DerivedData/SimpleScoreKeeper_Mac-bjvjeiybvmwfjpfilvnpezarwkml/Build/Products/Debug/SimpleScoreKeeper Mac.app/Contents/MacOS/SimpleScoreKeeper Mac" normal x86_64 cd "/Users/myusername/Dropbox/iphone app/SimpleScoreKeeper Mac" setenv MACOSX_DEPLOYMENT_TARGET 10.6 /Developer/usr/bin/clang -arch x86_64 -isysroot /Developer/SDKs/MacOSX10.6.sdk -L/Users/myusername/Library/Developer/Xcode/DerivedData/SimpleScoreKeeper_Mac-bjvjeiybvmwfjpfilvnpezarwkml/Build/Products/Debug -F/Users/myusername/Library/Developer/Xcode/DerivedData/SimpleScoreKeeper_Mac-bjvjeiybvmwfjpfilvnpezarwkml/Build/Products/Debug -filelist "/Users/myusername/Library/Developer/Xcode/DerivedData/SimpleScoreKeeper_Mac-bjvjeiybvmwfjpfilvnpezarwkml/Build/Intermediates/SimpleScoreKeeper Mac.build/Debug/SimpleScoreKeeper Mac.build/Objects-normal/x86_64/SimpleScoreKeeper Mac.LinkFileList" -mmacosx-version-min=10.6 -framework Cocoa -o "/Users/myusername/Library/Developer/Xcode/DerivedData/SimpleScoreKeeper_Mac-bjvjeiybvmwfjpfilvnpezarwkml/Build/Products/Debug/SimpleScoreKeeper Mac.app/Contents/MacOS/SimpleScoreKeeper Mac"

ld: duplicate symbol _addScores in /Users/myusername/Library/Developer/Xcode/DerivedData/SimpleScoreKeeper_Mac-bjvjeiybvmwfjpfilvnpezarwkml/Build/Intermediates/SimpleScoreKeeper Mac.build/Debug/SimpleScoreKeeper Mac.build/Objects-normal/x86_64/Prefrences.o and /Users/myusername/Library/Developer/Xcode/DerivedData/SimpleScoreKeeper_Mac-bjvjeiybvmwfjpfilvnpezarwkml/Build/Intermediates/SimpleScoreKeeper Mac.build/Debug/SimpleScoreKeeper Mac.build/Objects-normal/x86_64/RootController.o for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation) Command /Developer/usr/bin/clang failed with exit code 1

我项目中的(可能)相关文件如下。

RootController.h - All the interface declarations for stuff in the MainMenu.xib window
RootController.m - Where I need to import the files to
MainMenu.xib - The nib owned by the RootController class
Preferences.h - A file I'd want to import, but it won't work.
Preferences.m - A file I'd (maybe) want to import, but it won't work.
Preferences.xib - The nib owned by the Preferences class.
PreferencesMenuController.h - Where I declare the clickPreferences action. (Liked to MainMenu.xib)
PreferencesMenuController.m - Where I say that clickPreferences opens up Preferences nib.  (Linked to MainMenu.xib)

我会收到此错误的原因是什么？我正在导入的类(class)中需要做些什么吗？请非常详细，我是该语言的新手，所以可能不知道如何做某些事情。如果有什么我需要澄清的，请告诉我。

编辑: 这是我无法导入的文件的代码。

#import "Preferences.h"

@implementation Preferences

int addScores;

- (IBAction)addScoresToggled
{
    NSLog(@"addScores was toggled.");
}


- (id)initWithWindow:(NSWindow *)window
{
    self = [super initWithWindow:window];
    if (self) {

    }

    return self;
}

- (void)dealloc
{
    [super dealloc];
}

- (void)windowDidLoad
{
    [super windowDidLoad];
}

@end

Answer 1

如果您不小心包含了实现文件而不是头文件，您也可能会遇到此错误。例如#import "MyClass.m"而不是 #import "MyClass.h"