LVMixStreamInput Class Reference Inherits from NSObject Declared in LVRTCEngineDefines.h Overview 用户视频位置配置 userId 用户标识 @property (nullable, nonatomic, copy) NSString *userId Declared In LVRTCEngineDefines.h mixRect 混流用户视频在画布中的位置 @property (nonatomic, assign) CGRect mixRect Declared In LVRTCEngineDefines.h