The first line is the output of the Map object, and the second line is the UserInfo object reference.

第一行是map对象的输出，第二行是UserInfo对象引用。

youdao

The notification object is the window object that has become hidden. This notification does not contain a userInfo dictionary.

这个消息对象是当视窗对象变为隐藏时触发。这个消息不包含用户信息字典。

youdao

The notification object is the window object that has become hidden. This notification does not contain a userInfo dictionary.

这个消息对象是当视窗对象变为隐藏时触发。这个消息不包含用户信息字典。

youdao