Out of Comfort Zone

a project template compatible for iOS13 and pre-iOS13;

使用UIAlertController时的内存问题探讨;

a record for UICollectionView crash by invalid number index;

correctly add child view controller with UINavigationController;

记录UIViewController生命周期事件未运行问题的解决；

国行iPhone上使用UIActivityViewController无法分享到 Facebook/Twitter

summary of how to handle rotation in iPhone;

Error: Multiple commands produce 的解决;

WWDC2019-universal link 中的更新; New in Universal Link;

WWDC2019之sign in with Apple；使用Apple ID 登录;