ios - clang : error: linker command failed with exit code 1 (use -v to see invocation) when doing unit test on xcode

Question

当我在 xcode 上进行单元测试时遇到此错误。我尝试导入“SignIn.h”并测试 SignIn.h/SignIn.m 中定义的VerifyEmail 类。

我的代码如下:

#import <XCTest/XCTest.h>
#import "SignIn.h"

@interface SignInTests : XCTestCase

@property (nonatomic) VerifyEmail* verifyEmail;

@end

@implementation SignInTests

- (void)testVerifyEmail
{
    _verifyEmail = [[VerifyEmail alloc] init];
}
...

我只是遵循通常的单元测试流程。 import "SignIn.h"和 @property (nonatomic) VerifyEmail* verifyEmail 没问题，但是当我尝试初始化 verifyEmail (_verifyEmail = [[VerifyEmail alloc] init];) 时出现如下错误:

ld: warning: directory not found for option '-Llibs/Debug-iphonesimulator'
Undefined symbols for architecture x86_64:
  "_OBJC_CLASS_$_VerifyEmail", referenced from:
      objc-class-ref in SignInTests.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

我已经为此工作了很长时间，确实需要有人帮助。谢谢!

Answer 1

当尝试向现有 iOS 项目添加单元测试时，有时需要在主应用程序目标的build设置中将“默认隐藏的符号”设置为否。 查看此帖子:http://twobitlabs.com/2011/06/adding-ocunit-to-an-existing-ios-project-with-xcode-4/

它仍然适用于 xcode 7。谢谢 Todd!