错误提示：Could not Build module ImageIO:
原因：修改了XCode API 源文件
措施：从一个干净的未曾修改过的XCode中拷贝一份相应的文件添加到发生错误的XCode中
路径：/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/System/Library/Frameworks/ImageIO.framework/Headers/