Question

我是Xcode开发的新手，最近在我的项目开发过程中发现了一些奇怪的情况，只是想知道如果有人可以帮我解决这个问题，下面是我在尝试构建/运行时遇到的错误：

Ld /Users/ACE/Library/Developer/Xcode/DerivedData/ACE-ayqohtkcbgquxjgnnsbnwcketmir/Build/Products/Debug-iphonesimulator/ACE.app/ACE normal i386
    cd /Users/ACE/Documents/Development/Products/ACE4
    setenv MACOSX_DEPLOYMENT_TARGET 10.6
    setenv PATH "/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
    /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/clang -arch i386 -isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.0.sdk -L/Users/ACE/Library/Developer/Xcode/DerivedData/ACE-ayqohtkcbgquxjgnnsbnwcketmir/Build/Products/Debug-iphonesimulator -L/Users/ACE/Documents/Development/Products/ACE4/Classes/SUP/libs/Debug-iphonesimulator -F/Users/ACE/Library/Developer/Xcode/DerivedData/ACE-ayqohtkcbgquxjgnnsbnwcketmir/Build/Products/Debug-iphonesimulator -filelist "/Users/ACE/Library/Developer/Xcode/DerivedData/ACE-ayqohtkcbgquxjgnnsbnwcketmir/Build/Intermediates/ACE.build/Debug-iphonesimulator/ACE Simulator.build/Objects-normal/i386/ACE.LinkFileList" -mmacosx-version-min=10.6 -Xlinker -objc_abi_version -Xlinker 2 -Xlinker -no_implicit_dylibs -D__IPHONE_OS_VERSION_MIN_REQUIRED=40200 -lz.1.2.5 -framework Foundation -framework UIKit -framework CoreGraphics -framework AddressBook -framework CoreFoundation -framework QuartzCore -framework Security -lstdc++ -licucore.A -lclientrt -lMO -lSUPObj -framework MapKit -o /Users/ACE/Library/Developer/Xcode/DerivedData/ACE-ayqohtkcbgquxjgnnsbnwcketmir/Build/Products/Debug-iphonesimulator/ACE.app/ACE

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

当我尝试使用我的自定义类（UIViewController的子类）

创建对象时，总会出现此错误

CustomViewController *customView = [[CustomViewController alloc] init];

奇怪的是，如果我直接使用UIViewController

，错误就会消失并完美运行

UIViewController *customView = [[UIViewController alloc] init];

当我使用UIButton中的自定义类时，

下面是另一个错误：

Ld /Users/ACE/Library/Developer/Xcode/DerivedData/ACE-ayqohtkcbgquxjgnnsbnwcketmir/Build/Products/Debug-iphonesimulator/ACE.app/ACE normal i386
    cd /Users/ACE/Documents/Development/Products/ACE4
    setenv MACOSX_DEPLOYMENT_TARGET 10.6
    setenv PATH "/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
    /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/clang -arch i386 -isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.0.sdk -L/Users/ACE/Library/Developer/Xcode/DerivedData/ACE-ayqohtkcbgquxjgnnsbnwcketmir/Build/Products/Debug-iphonesimulator -L/Users/ACE/Documents/Development/Products/ACE4/Classes/SUP/libs/Debug-iphonesimulator -F/Users/ACE/Library/Developer/Xcode/DerivedData/ACE-ayqohtkcbgquxjgnnsbnwcketmir/Build/Products/Debug-iphonesimulator -filelist "/Users/ACE/Library/Developer/Xcode/DerivedData/ACE-ayqohtkcbgquxjgnnsbnwcketmir/Build/Intermediates/ACE.build/Debug-iphonesimulator/ACE Simulator.build/Objects-normal/i386/ACE.LinkFileList" -mmacosx-version-min=10.6 -Xlinker -objc_abi_version -Xlinker 2 -Xlinker -no_implicit_dylibs -D__IPHONE_OS_VERSION_MIN_REQUIRED=40200 -lz.1.2.5 -framework Foundation -framework UIKit -framework CoreGraphics -framework AddressBook -framework CoreFoundation -framework QuartzCore -framework Security -lstdc++ -licucore.A -lclientrt -lMO -lSUPObj -framework MapKit -o /Users/ACE/Library/Developer/Xcode/DerivedData/ACE-ayqohtkcbgquxjgnnsbnwcketmir/Build/Products/Debug-iphonesimulator/ACE.app/ACE

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

这是我的自定义类：

#import <UIKit/UIKit.h>

@interface AceButton : UIButton{
    NSString *identifier;
}

@property(nonatomic,retain) NSString *identifier;

@end

在我的一个View Controller方法viewDidLoad（）

中

AceButton *button1 = [[AceButton alloc] initWithFrame:frame];

Answer 1

错误消息基本上表示类TransportViewController使用类TransportMAPView，但链接器找不到类TransportMAPView（在构建过程结束时，它结合了所有类）将代码编译成单个可执行文件）。

类TransportViewController和TransportMAPView是您的代码的一部分吗？如果TransportMAPView应该在库中，那么库就没有正确添加。

具有自定义子类的体系结构i386的未定义符号

1 个答案: