ios View中添加通知和移除通知

//这个方法相当于vc中的viewDidLoad
-(void)didMoveToWindow{
    if (self.window) {
        [self XSAddNotice];

    }
}

//从当前window删除 相当于-viewDidUnload
-(void)willMoveToWindow:(UIWindow *)newWindow{
    if (newWindow == nil) {
        [[NSNotificationCenter defaultCenter] removeObserver:self];
    }
}