iOS 简单实现label点击放大动画

先看效果

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代码很简单懒加载一个label.然后把他添加到self.view

- (UILabel *)label {
    if (_label == nil) {
        _label = [[UILabel alloc]initWithFrame:CGRectMake(100, 50, 120, 21)];
        _label.text = @"我会放大";
        _label.textColor = [UIColor redColor];
        _label.userInteractionEnabled = YES;
        _label.layer.shadowOpacity = 1;
        _label.layer.shadowColor = [UIColor blueColor].CGColor;
        _label.layer.shadowOffset = CGSizeMake(1, 1);
        UITapGestureRecognizer *tapRecognizerBottom =
        [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(respondToTapGesture:)];
       
        [_label addGestureRecognizer:tapRecognizerBottom];
        
    }
    
    return _label;
}

    [self.view addSubview:self.label];

在点击事件中添加帧动画

- (void)respondToTapGesture:(UITapGestureRecognizer *)ges {
    UIView *targetView = ges.view;
    
    CAKeyframeAnimation *animation = [CAKeyframeAnimation animation];
    animation.keyPath = @"transform.scale";
    animation.values = @[@0.2,@20.8,@0.9,@1.0];
    animation.duration = 0.3;
    animation.calculationMode = kCAAnimationPaced;
    //把动画添加上去就OK了
    [targetView.layer addAnimation:animation forKey:nil];
}

总结添加动画很简单,会给label加,其他的view层也是一样的,所以tabbar点击动画原理也是这样的