self.faceshowing = !self.facshowing无效，了，原来set

- (void)setFaceShowing:(BOOL)faceShowing

{

    if (self.faceShowing == faceShowing) {

        return;

    }

    _faceShowing = faceShowing;

}

系统行为，

转载于:https://www.cnblogs.com/guligei/p/3274921.html