ios 直播间点赞动画

直播间点赞动画

#pragma mark - 点赞动画

- (void)praiseAnimation {  

    UIImageView *imageView = [[UIImageView alloc] init];  

    CGRect frame = self.view.frame; // 初始frame，即设置了动画的起点  

    imageView.frame = CGRectMake(frame.size.width - 40, frame.size.height - 65, 30, 30); // 初始化imageView透明度为0     imageView.alpha = 0;  

    imageView.backgroundColor = [UIColor clearColor];  

    imageView.clipsToBounds = YES; // 用0.2秒的时间将imageView的透明度变成1.0，同时将其放大1.3倍，再缩放至1.1倍，这里参数根据需求设置     [UIView animateWithDuration:0.2 animations:^{  

        imageView.alpha = 1.0;  

        imageView.frame = CGRectMake(frame.size.width - 40, frame.size.height - 90, 30, 30);  

        CGAffineTransform transfrom = CGAffineTransformMakeScale(1.3, 1.3);  

        imageView.transform = CGAffineTransformScale(transfrom, 1, 1);  

    }];  

    [self.view addSubview:imageView]; // 随机产生一个动画结束点的X值  

    CGFloat finishX = frame.size.width - round(random() % 200); // 动画结束点的Y值  

    CGFloat finishY = 200; // imageView在运动过程中的缩放比例  

    CGFloat scale = round(random() % 2) + 0.7; // 生成一个作为速度参数的随机数  

    CGFloat speed = 1 / round(random() % 900) + 0.6; // 动画执行时间  

    NSTimeInterval duration = 4 * speed; // 如果得到的时间是无穷大，就重新附一个值（这里要特别注意，请看下面的特别提醒）  

    if (duration == INFINITY) duration = 2.412346; // 随机生成一个0~7的数，以便下面拼接图片名  

    int imageName = round(random() % 8); // 开始动画  

    [UIView beginAnimations:nil context:(__bridge void *_Nullable)(imageView)]; // 设置动画时间  

    [UIView setAnimationDuration:duration]; // 拼接图片名字  

    imageView.image = [UIImage imageNamed:[NSString stringWithFormat:@"good%d_30x30_.png",imageName]]; // 设置imageView的结束frame  

    imageView.frame = CGRectMake( finishX, finishY, 30 * scale, 30 * scale); // 设置渐渐消失的效果，这里的时间最好和动画时间一致     [UIView animateWithDuration:duration animations:^{  

        imageView.alpha = 0;  

    }]; // 结束动画，调用onAnimationComplete:finished:context:函数  

    [UIView setAnimationDidStopSelector:@selector(onAnimationComplete:finished:context:)]; // 设置动画代理  

    [UIView setAnimationDelegate:self];  

    [UIView commitAnimations];

}

/// 动画完后销毁iamgeView

- (void)onAnimationComplete:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context{  

    UIImageView *imageView = (__bridge UIImageView *)(context);  

    [imageView removeFromSuperview];  

    imageView = nil;

}