ios - 如何在ios中实现instagram similar like效果？

Question

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Answer 1

这是一个实现:

- (void) animateLike {
    [UIView animateWithDuration:0.3f delay:0 options:UIViewAnimationOptionAllowUserInteraction animations:^{
        heartPopup.transform = CGAffineTransformMakeScale(1.3, 1.3);
        heartPopup.alpha = 1.0;
    } completion:^(BOOL finished) {
        [UIView animateWithDuration:0.1f delay:0 options:UIViewAnimationOptionAllowUserInteraction animations:^{
            heartPopup.transform = CGAffineTransformMakeScale(1.0, 1.0);
        } completion:^(BOOL finished) {
            [UIView animateWithDuration:0.3f delay:0 options:UIViewAnimationOptionAllowUserInteraction animations:^{
                heartPopup.transform = CGAffineTransformMakeScale(1.3, 1.3);
                heartPopup.alpha = 0.0;
            } completion:^(BOOL finished) {
                heartPopup.transform = CGAffineTransformMakeScale(1.0, 1.0);
            }];
        }];
    }];
}

Swift 3.0 代码

func likeAnimation() {
    UIView.animate(withDuration: 0.3, delay: 0, options: .allowUserInteraction, animations: {() -> Void in
        heartPopup.transform = CGAffineTransform(scaleX: 1.3, y: 1.3)
        heartPopup.alpha = 1.0
    }, completion: {(_ finished: Bool) -> Void in
        UIView.animate(withDuration: 0.1, delay: 0, options: .allowUserInteraction, animations: {() -> Void in
            heartPopup.transform = CGAffineTransform(scaleX: 1.0, y: 1.0)
        }, completion: {(_ finished: Bool) -> Void in
            UIView.animate(withDuration: 0.3, delay: 0, options: .allowUserInteraction, animations: {() -> Void in
                heartPopup.transform = CGAffineTransform(scaleX: 1.3, y: 1.3)
                heartPopup.alpha = 0.0
            }, completion: {(_ finished: Bool) -> Void in
                heartPopup.transform = CGAffineTransform(scaleX: 1.0, y: 1.0)
            })
        })
    })
}

heartPopup 是一个 UIImageView，将其设置在图像中心的界面构建器中，并将其上的 alpha 设置为零。调用上面的方法来动画点赞效果。

Swift 4(代码来自评论)

if let bigLikeImageV = likeImageV, liked == true {
        UIView.animate(withDuration: 0.6, delay: 0, usingSpringWithDamping: 0.4, initialSpringVelocity: 0.2, options: .allowUserInteraction, animations: {
            bigLikeImageV.transform = CGAffineTransform(scaleX: 1.6, y: 1.6)
            bigLikeImageV.alpha = 1.0
        }) { finished in
            bigLikeImageV.alpha = 0.0
            bigLikeImageV.transform = CGAffineTransform(scaleX: 1.0, y: 1.0)
        }
}