link不上ScreenshotServices库

需求: ScreenshotServices是iOS11以后截屏的库,但是我连link都link不上
**日志: ld: framework not found ScreenshotServices
**代码:
void *SBServer = dlopen("/System/Library/PrivateFrameworks/ScreenshotServices.framework/ScreenshotServices", RTLD_LAZY); //用这种方法可以找到库
SSMainScreenSnapshotter *shoppter = [[SSMainScreenSnapshotter alloc] init];//但是一使用Undefined symbols for architecture arm64:
OBJC_CLASS$_SSMainScreenSnapshotter”
** 任何其他描述: (描述问题的现象,等等)
** 环境: iphone6,iOS11.1.3,已越狱

iOS PRIVATE SDK 请

或者把SSMainScreenSnapshotter换成objc_getClass("SSMainScreenSnapshotter")