[iOS开发]通知传值

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

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- (void)receive:(NSNotification *)notification {
    NSDictionary *dict = notification.userInfo;
    _firstLabel.text = dict[@"first"];
    _secondLabel.text = dict[@"second"];
}

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+ (instancetype)notificationWithName:(NSNotificationName)aName object:(nullable id)anObject userInfo:(nullable NSDictionary *)aUserInfo;

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- (void)back {
    //创建通知对象
    NSNotification *notification = [NSNotification notificationWithName:@"send" object:self userInfo:@{@"first":_firstTextField.text,@"second":_secondTextField.text}];
    //注意name
    //通知中心发布通知
    [[NSNotificationCenter defaultCenter] postNotification:notification];
    [self dismissViewControllerAnimated:YES completion:nil];
}

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- (void)dealloc {
    [[NSNotificationCenter defaultCenter] removeObserver:self name:@"send" object:nil];
}