客戶端代碼

• 點擊小紅心祥款，發(fā)送socket給服務器,并且要傳遞房間Key給服務器，通知給哪個主播點贊，就能傳入到對應的分組socket中
• 怎么傳遞房間key扫尖，房間Key在主播界面悴品，一般一個客戶端禀综，只會產(chǎn)生一個房間，可以記錄到socket對象中
• 業(yè)務邏輯：用戶點擊小紅心,小紅心就會往上慢慢飄苔严。
• 實現(xiàn)原理：其實就是一個動畫定枷。
• 怎么實現(xiàn):用UIView做不了，因為小紅心是不規(guī)則的左右擺動届氢，慢慢上去的欠窒。
• 可以使用核心動畫(創(chuàng)建CALayer),CABasicAnimation和CAKeyframeAnimation，放在一個group組中退子。
• CABasicAnimation：漸漸顯示動畫岖妄，修改透明度
• CAKeyframeAnimation:做路徑動畫，描述小紅心的路徑寂祥，然后按照這個路徑走.
  • 描述一根線衣吠，x從寬度中獲取隨機值，y值每次減減
• 動畫完成壤靶，記得移除缚俏，可以用動畫事務類，監(jiān)聽動畫是否完成,代碼一定要放在最前面

XMGLiveOverlayViewController.m

- (IBAction)clickUpvote:(id)sender {
    
    // 發(fā)送點贊事件
    [[SocketIOClient clientSocket] emit:@"upvote" with:@[[SocketIOClient clientSocket].roomKey]];
    
}


XMGUpVoteViewController.m
- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    [[SocketIOClient clientSocket] on:@"upvote" callback:^(NSArray * _Nonnull data, SocketAckEmitter * _Nonnull ack) {
       // 監(jiān)聽到點贊,進行點贊動畫
        [self setupVoteLayer];
    }];
    
}

- (void)setupVoteLayer
{
    CALayer *layer = [CALayer layer];
    layer.contents = (id)[UIImage imageNamed:@"hearts (1)"].CGImage;
    [self.view.layer addSublayer:layer];
    layer.bounds = CGRectMake(0, 0, 30, 30);
    layer.position = CGPointMake(self.view.width * 0.5, self.view.height);
    
    [self setupAnim:layer];
}

- (void)setupAnim:(CALayer *)layer
{
    [CATransaction begin];
    
    [CATransaction setCompletionBlock:^{
        [layer removeAllAnimations];
        [layer removeFromSuperlayer];
    }];
    
    // 創(chuàng)建basic動畫
    CABasicAnimation *alphaAnim = [CABasicAnimation animation];
    alphaAnim.keyPath = @"alpha";
    alphaAnim.fromValue = @0;
    alphaAnim.toValue = @1;
    
    // 路徑動畫
    CAKeyframeAnimation *pathAnim = [CAKeyframeAnimation animation];
    pathAnim.keyPath = @"position";
    pathAnim.path = [self animPath].CGPath;
    
    
    // 創(chuàng)建動畫組
    CAAnimationGroup *group = [CAAnimationGroup animation];
    group.animations = @[alphaAnim,pathAnim];
    group.duration = 5;
    [layer addAnimation:group forKey:nil];
    
    
    
    [CATransaction commit];
}


- (UIBezierPath *)animPath
{
    UIBezierPath *path = [UIBezierPath bezierPath];
    
    CGFloat y = self.view.height;
    CGFloat x = self.view.width * 0.5;
    while (y > 0) {
        x = arc4random_uniform(self.view.width - 20) + 20;
        if (y == self.view.height) {
            [path moveToPoint:CGPointMake(x, y)];
        } else {
            [path addLineToPoint:CGPointMake(x, y)];
        }
        y -= 20;
    }
    
    
    return path;
}