1 基本用法

添加观察（可能很多页面）

[[NSNotificationCenterdefaultCenter] addObserver:selfselector:@selector(changeIntlCode:)name:NOTIFICATION_SUCCESS_SELECT_INTLCODEobject:nil];

发出通知（可能只有一个页面）

[[NSNotificationCenterdefaultCenter] postNotificationName:NOTIFICATION_SUCCESS_SELECT_INTLCODEobject:niluserInfo:[NSDictionarydictionaryWithObject:model forKey:@"selectedIntlCodeModel"]];

在 dealloc中移除监听

[[NSNotificationCenter defaultCenter] removeObserver:self name:NOTIFICATION_SUCCESS_SELECT_INTLCODE object:nil];