<unknown>:0: error: failed

error: 'AFNetworking.h' file not found

#import "AFNetworking.h"
<unknown>:0: error: failed to import bridging header ‘path/to/project/<main project directory>/projectName-Bridging-Header.h'

解决方法：
BuildSettings → Header Search Paths 加上 "${PODS_ROOT}/" 属性为 recursive

来源：stackoverflow