View 的Push 方法：
if let tabVC = UIApplication.shared.keyWindow?.rootViewController as? UITabBarController,
let navi = tabVC.selectedViewControlleras?UINavigationController{
let playVC =BCPlayerViewController()
playVC.hidesBottomBarWhenPushed = true
navi.pushViewController(playVC,animated:true)
}
问题：当在 BCPlayerViewController popViewController 回去时出现界面卡顿
原因：BCPlayerViewController 上添加了一个UIImageView ：
bgImageView.frame = CGRectMake(0, 0,kScreenWidth, kScreenHeight)
bgImageView.sd_setImage(with: NSURL(string: BCPlayerManager.shared.player?.songModel.albumimg ?? "") as URL?, placeholderImage: UIImage(named: "lost_icon"))
bgImageView.contentMode = .scaleAspectFill
view.addSubview(bgImageView)
解决方式：在popViewController 之前，移除这个UIImageView
bgImageView.removeFromSuperview()
self.navigationController?.popViewController(animated: true)
另：真正的原因是这一句：bgImageView.sd_setImage(with: NSURL(string: BCPlayerManager.shared.player?.songModel.albumimg ?? "") as URL?, placeholderImage: UIImage(named: "lost_icon")) 取消了就没事了。原因不明。
