iOS 导入谷歌xml报错解决方法

新项目导入内容错误:  libxml/tree.h file not found
1.  导入libxml2.dylib 包
2.build settings —>header search Paths 添加:
   $(SDKROOT)/usr/include/libxml2

其它问题

declaration of 'objc_property_t' must be import from module 'ObjectiveC.runtime' before it is required:
 应该特别注意的是在使用 objc_property_t 时先导入头文件 #import<objc/runtime.h>，否则报错：Declaration of 'objc_property_t' must be imported from module 'objectiveC.runtime'before it is required.

No visible @interface for 'SCBaseManagedDomain' declares the selector 'enumPropertiesUsiingBlock:'
文件没有包含某个类

expected a type:
需要自己手动导入库#import <UIKit/UIKit.h>