Question

我正在研究CS193P，我想创建一种效果，卡片从0,0一个接一个地卡入到位。我试图链接动画，但视图一起飞行我也试图使用UIDynamicAnimator，同样的事情发生。所有观点都在一起攫取。这是我必须捕捉视图的代码。

-(void)snapCardsForNewGame
{
    for (PlayingCardView *cardView in self.cards){
        NSUInteger cardViewIndex = [self.cards indexOfObject:cardView];
        int cardColumn = (int) cardViewIndex / self.gameCardsGrid.rowCount;
        int cardRow = (int) cardViewIndex % self.gameCardsGrid.rowCount;
        UISnapBehavior *snapCard = [[UISnapBehavior alloc]initWithItem:cardView snapToPoint:[self.gameCardsGrid centerOfCellAtRow:cardRow inColumn:cardColumn]];
        snapCard.damping = 1.0;
        [self.animator addBehavior:snapCard];

    }


}


-(void)newGame
{
    NSUInteger numberOfCardsInPlay = [self.game numberOfCardsInPlay];
    for (int i=0; i<numberOfCardsInPlay; i++) {
        PlayingCardView *playingCard = [[PlayingCardView alloc]initWithFrame:CGRectMake(0, 0, 50, 75)];
        playingCard.faceUp = YES;
        [playingCard addGestureRecognizer:[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(flipCard:)]];
        [self.cards addObject:playingCard];
        //NSUInteger cardViewIndex = [self.cards indexOfObject:playingCard];
        //int cardColumn = (int) cardViewIndex / self.gameCardsGrid.rowCount;
        //int cardRow = (int) cardViewIndex % self.gameCardsGrid.rowCount;

       // playingCard.frame = [self.gameCardsGrid frameOfCellAtRow:cardRow inColumn:cardColumn];
        playingCard.center = CGPointMake(0, 0);
        [self.gameView addSubview:playingCard];
        [self snapCardsForNewGame];
    }
}

在这种情况下使用它是否有意义？我尝试了几个不同的东西让卡片一个接一个地飞，但是不能。

提前致谢！

Answer 1

由于您同时添加了所有UISnapBehaviors，动画师会将它们全部一起运行。延迟将它们添加到动画制作者，他们将自己动画。

-(void)snapCardsForNewGame
{
    for (PlayingCardView *cardView in self.cards){
        NSUInteger cardViewIndex = [self.cards indexOfObject:cardView];
        int cardColumn = (int) cardViewIndex / self.gameCardsGrid.rowCount;
        int cardRow = (int) cardViewIndex % self.gameCardsGrid.rowCount;
        UISnapBehavior *snapCard = [[UISnapBehavior alloc]initWithItem:cardView snapToPoint:[self.gameCardsGrid centerOfCellAtRow:cardRow inColumn:cardColumn]];
        snapCard.damping = 1.0;

        NSTimeInterval delayTime = 0.01 * cardViewIndex;
        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayTime * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
            [self.animator addBehavior:snapCard];
        });
    }
}

是否可以连续使用UISnapBehavior捕获UIViews

1 个答案: