识别对在iOS中以编程方式创建的UIViews子类的触摸

Question

I am creating an app with cards. In my mainViewController, I have this code:

CardView *cardView = [[CardView alloc] initWithFrame:CGRectMake(0, 0, CardWidth, CardHeight)];
                    cardView.card = [player.closedCards cardAtIndex:t];
                    [self.cardContainerView addSubview:cardView];
                    [cardView animateDealingToBottomPlayer:player withIndex:t withDelay:delay];
                    delay += 0.1f;

where CardView is a subclass of UIView. Each Card is a unique cardView and in CardView.m I do have:

@implementation CardView
{
    UIImageView *_backImageView;
    UIImageView *_frontImageView;
    CGFloat _angle;
}

@synthesize card = _card;

- (id)initWithFrame:(CGRect)frame
{
    if ((self = [super initWithFrame:frame]))
    {
        self.backgroundColor = [UIColor clearColor];
        [self loadBack];
        self.userInteractionEnabled=YES;
    }
    return self;
}

- (void)loadBack
{
    if (_backImageView == nil)
    {
        _backImageView = [[UIImageView alloc] initWithFrame:self.bounds];
        _backImageView.image = [UIImage imageNamed:@"Back"];
        _backImageView.contentMode = UIViewContentModeScaleToFill;
        [self addSubview:_backImageView];
    }
}

and the implementations for other functions .

Since in order to win space, one card is placed on top of the others (half of teh card is visible and the rest is covered by the next card and so on), I want to identify touches on each card.

If I place that code in CardView:

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    NSLog(@"Card is touched");
}

it is never called. If I place it in the GameView Controller it is called anywhere that I will touch, but I do not know how to identify which cardView is called. Can you give me a hint?

EDIT: I decided to use gestures. Therefore in my mainViewController changed the code to this:

for (PlayerPosition p = startingPlayer.position; p < startingPlayer.position + 4; ++p)
{
   CardView *cardView = [[CardView alloc] initWithFrame:CGRectMake(0, 0, CardWidth, CardHeight)];
   cardView.card = [player.closedCards cardAtIndex:t];
   cardView.userInteractionEnabled=YES;
   [self.cardContainerView addSubview:cardView];
   [cardView animateDealingToBottomPlayer:player withIndex:t withDelay:delay];
   delay += 0.1f;
   UITapGestureRecognizer *recognizer=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(cardSelected:)];
   [cardView addGestureRecognizer:recognizer];
}

but this is never called.

-(void)cardSelected:(UITapGestureRecognizer *)recognizer
{
    NSLog(@"Card Selected with gestures");
}

Why is that?

EDIT 2:

I have also tried adding this:

self.cardContainerView.userInteractionEnabled=YES; 

or changing this:

UITapGestureRecognizer *recognizer=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(cardSelected:)];

to this:

UITapGestureRecognizer *recognizer=[[UITapGestureRecognizer alloc]initWithTarget:self .cardContainerView action:@selector(cardSelected:)];

but none of them worked.

Answer 1

If you instead add a tap gesture recogniser to each card view you can get a callback to a method you specify and the gesture is connected to the view so you can directly get a reference to it.

---

Your CardView (which I guess is a subclass of UIView ?) has 2 subviews, which are image views:

UIImageView *_backImageView;
UIImageView *_frontImageView;

You may want to set userInteractionEnabled to YES on one or both of them (depending on when the card should be tappable and when the subviews are shown and hidden).

You can also act as the delegate of the gesture (if you need to, or just temporarily to debug that the gesture is getting triggered but blocked by something other gesture).