Opengl es xcode6中的OpenGLES链接错误：架构arm64的未定义符号

更新到

Xcode 6.0.1

后，我的项目在链接阶段生成错误。我不知道为什么，但我确信这是关于

OpenGLES

的。因为当我删除关于这一点的代码时，它构建得很好

以下是完整的错误消息：

Undefined symbols for architecture arm64:
  "_OBJC_CLASS_$_EAGLContext", referenced from:
      objc-class-ref in PPSSignatureView.o
  "_glDisable", referenced from:
      -[PPSSignatureView setupGL] in PPSSignatureView.o
  "_glGenVertexArraysOES", referenced from:
      -[PPSSignatureView setupGL] in PPSSignatureView.o
  "_glGenBuffers", referenced from:
      -[PPSSignatureView setupGL] in PPSSignatureView.o
  "_glBufferData", referenced from:
      -[PPSSignatureView setupGL] in PPSSignatureView.o
  "_glVertexAttribPointer", referenced from:
      -[PPSSignatureView bindShaderAttributes] in PPSSignatureView.o
  "_glDeleteVertexArraysOES", referenced from:
      -[PPSSignatureView tearDownGL] in PPSSignatureView.o
  "_glMapBufferOES", referenced from:
      _addVertex in PPSSignatureView.o
  "_glDrawArrays", referenced from:
      -[PPSSignatureView drawRect:] in PPSSignatureView.o
  "_glBindBuffer", referenced from:
      -[PPSSignatureView tap:] in PPSSignatureView.o
      -[PPSSignatureView pan:] in PPSSignatureView.o
      -[PPSSignatureView setupGL] in PPSSignatureView.o
  "_glClearColor", referenced from:
      -[PPSSignatureView drawRect:] in PPSSignatureView.o
  "_glDeleteBuffers", referenced from:
      -[PPSSignatureView tearDownGL] in PPSSignatureView.o
  "_glClear", referenced from:
      -[PPSSignatureView drawRect:] in PPSSignatureView.o
  "_glUnmapBufferOES", referenced from:
      _addVertex in PPSSignatureView.o
  "_glBindVertexArrayOES", referenced from:
      -[PPSSignatureView drawRect:] in PPSSignatureView.o
      -[PPSSignatureView setupGL] in PPSSignatureView.o
  "_glEnableVertexAttribArray", referenced from:
      -[PPSSignatureView bindShaderAttributes] in PPSSignatureView.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

---

导入代码：import

OpenGLES/ES2/glext.h

听起来你好像没有链接到OpenGLES

在您的项目设置中，转到“构建阶段”，并在“将二进制文件链接到库”中添加OpenGLES.framework