Xcode项目构建：失败

Question

我正在开发简单的应用程序，并且在编写代码时没有错误，但是当我按下构建按钮时，就发生了错误。 生成myProject：失败，并且xCode向我显示两个错误警告。 错误消息如下：

 Ld /Users/MacUser/Library/Developer/Xcode/DerivedData/Calculator-azorstixlscpikfhurtxwvvwachh/Build/Products/Debug-iphonesimulator/Calculator.app/Calculator normal i386
cd "/Users/MacUser/Downloads/Downloads/Desktop/old drop box/calc/Calculator"
setenv MACOSX_DEPLOYMENT_TARGET 10.6
setenv PATH "/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -arch i386 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.1.sdk
-L/Users/MacUser/Library/Developer/Xcode/DerivedData/Calculator-azorstixlscpikfhurtxwvvwachh/Build/Products/Debug-iphonesimulator 
-F/Users/MacUser/Library/Developer/Xcode/DerivedData/Calculator-azorstixlscpikfhurtxwvvwachh/Build/Products/Debug-iphonesimulator 
-filelist /Users/MacUser/Library/Developer/Xcode/DerivedData/Calculator-azorstixlscpikfhurtxwvvwachh/Build/Intermediates/Calculator.build/Debug-iphonesimulator/Calculator.build/Objects-normal/i386/Calculator.LinkFileList 
-mmacosx-version-min=10.6 -Xlinker 
-objc_abi_version -Xlinker 2 
-fobjc-arc -fobjc-link-runtime -Xlinker -no_implicit_dylibs -D__IPHONE_OS_VERSION_MIN_REQUIRED=50100 
-framework UIKit -framework Foundation -framework CoreGraphics 
-o /Users/MacUser/Library/Developer/Xcode/DerivedData/Calculator-azorstixlscpikfhurtxwvvwachh/Build/Products/Debug-iphonesimulator/Calculator.app/Calculator

Undefined symbols for architecture i386:
"_OBJC_CLASS_$_AxesDrawer", referenced from:
  objc-class-ref in AxesView.o
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)

我发现了一些东西，这是我的controller.m代码：

#import "AxesView.h"
#import "AxesDrawer.h"

@implementation AxesView


- (void)drawRect:(CGRect)rect
{
   CGRect b;
   b = self.bounds;
   CGPoint aO;
   aO = b.origin;
   CGFloat pPU;
   pPU = b.size.height;

   [AxesDrawer drawAxesInRect:(CGRect)b originAtPoint:(CGPoint)aO scale:(CGFloat)pPU];
}
@end

我在AxesDrawer.h文件中认为的问题，但我不知道为什么。 如果我将导入从AxesDrawer.h更改为AxesDrawer.m（我知道这是错误的，但仅用于测试），则该项目将在模拟器中构建并运行。 有人可以帮我吗？ 我做错了什么？

Answer 1

AxesDrawer.m可能不在您的目标中。 单击它并使用最右边的“实用程序”面板，并确保已检查要构建的目标。