参考:
if (viewController.isViewLoaded && viewController.view.window) { // viewController is visible}本文共 147 字，大约阅读时间需要 1 分钟。
参考:
if (viewController.isViewLoaded && viewController.view.window) { // viewController is visible}转载于:https://www.cnblogs.com/qike/p/5587307.html