iOS中通知NSNotificationCenter的基本使用

1.注册通知

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(showProgressHud:) name:@"showProgressHud" object:nil];

2.发送通知

[[NSNotificationCenter defaultCenter] postNotificationName:@"showProgressHud" object:nil userInfo:@{@"string":@"登录成功"}];

3.实现方法

- (void)showProgressHud:(id)notification {
    
}

4.移除通知

[[NSNotificationCenter defaultCenter] removeObserver:self name:@"showProgressHud" object:nil];