Question

我在一个单独的类中创建了一个UIView，我试图在我的ViewController中设置它的动画。它应该像你在向下滑动时出现的iPhone上的通知屏幕一样工作，然后你可以将它向上滑动。

我可以让我的自定义视图向下滑动，但是当我尝试向上滑动时，向上滑动手势不会被启动。

我是新手，所以非常感谢任何帮助！

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.

    NotificationView *notificationView = [[NotificationView alloc]init];
    [self.view addSubview:notificationView];



    UISwipeGestureRecognizer *swipeDownGestureRecognizer = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipeDown:)];
    swipeDownGestureRecognizer.direction = UISwipeGestureRecognizerDirectionDown;

    UISwipeGestureRecognizer *swipeUpGestureRecognizer = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipeUp:)];
    swipeUpGestureRecognizer.direction = UISwipeGestureRecognizerDirectionUp;

    [self.view addGestureRecognizer:swipeDownGestureRecognizer];
    [notificationView addGestureRecognizer:swipeUpGestureRecognizer];

}

-(void) swipeUp: (UISwipeGestureRecognizer *) recognizer{

    UIView *notificationView = [[NotificationView alloc]init];
    notificationView = recognizer.view;

    [UIView animateWithDuration:2.0 animations:^{
        notificationView.frame = CGRectMake(0, 0, 414, 723);
    }];

}

-(void) swipeDown: (UISwipeGestureRecognizer *) recognizer{

    UIView *notificationView = [[NotificationView alloc]init];
    notificationView = recognizer.view;

    [UIView animateWithDuration:2.0 animations:^{
        notificationView.frame = CGRectMake(0, 723, 414, 723);
    }];

}

Answer 1

您应该使用notificationView创建一个属性并保留对它的引用，而不是一遍又一遍地创建一个新属性。

@property (strong, nonatomic) NotificationView *notificationView;

在您的viewDidLoad：

中

       _notificationView = [[NotificationView alloc] init];

// Important line to solve your problems on gestures not fired off on your notification view
_notificationView.userInteractionEnabled = YES;

        [self.view addSubview:_notificationView];

并简单地改变：

-(void)swipeDown:(UISwipeGestureRecognizer *)recognizer {

    [UIView animateWithDuration:2.0 animations:^{
        _notificationView.frame = CGRectMake(0, 723, 414, 723);
    }];

}

您应该查看有关属性如何工作的教程。你应该look into This Thread通过处理手势状态来避免动画被多次调用等。

Answer 2

ViewDidLoad中的notificationView应分配给viewControllers属性，并且不应在手势识别器操作中分配初始化视图。

UISwipeGestureRecognizer与UIView在一个单独的类中创建不起作用

2 个答案: