// 配置屏幕分享推流
[self.engine configLocalScreenPublish:YES];
// 启动推流
[self.engine publish:^(int err) {
}];
.....

// 配置屏幕分享停止
[self.engine configLocalScreenPublish:NO];
// 启动停推
[self.engine publish:^(int err) {
}];