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iOS仿AirPods弹出动画

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效果图

预览图

思路

在当前ViewController下Present另外一个AnimationViewController,在弹出的AnimationViewController中播放动画,弹出的时候原来的ViewController上有一个全屏覆盖的maskView,在弹出时,有一个渐变动画(页面渐黑),在AnimationViewController声明一个代理,在代理方法中实现收起的动画效果(dissmissController和maskView消失)

主要代码

HCAirPodsAnimationViewController *vc = [[HCAirPodsAnimationViewController alloc] init];
  vc.delegate = self;
  vc.modalPresentationStyle = UIModalPresentationOverCurrentContext;
  
  [UIView animateWithDuration:0.2 animations:^{
    self.maskBgView.alpha = 0.5;
  } completion:nil];
  
  [self presentViewController:vc animated:YES completion:^{
    [vc.animationView play];
  }];

模态跳转的style有一个枚举值,在iOS13以前modalPresentationStyle的默认值为UIModalPresentationFullScreen,iOS13以后变成了UIModalPresentationPageSheet,在这里我们把style设置为UIModalPresentationOverCurrentContext弹出的这个控制器就会覆盖在原来的控制器之上

- (UIView *)maskBgView
{
  if (!_maskBgView) {
    _maskBgView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height)];
    _maskBgView.backgroundColor = [UIColor blackColor];
    _maskBgView.alpha = 0;
    [self.view addSubview:_maskBgView];
  }
  return _maskBgView;
}

一个覆盖全屏的maskView采用懒加载的方式实现

- (void)initContentView
{
  CGFloat containerW = SCREEN_WIDTH - 20;
  CGFloat containerH = containerW * 0.9;
  UIView *containerView = [[UIView alloc] initWithFrame:CGRectMake(10, SCREEN_HEIGHT - containerH - 10, containerW, containerH)];
  containerView.layer.cornerRadius = 20;
  containerView.backgroundColor = [UIColor whiteColor];
  [self.view addSubview:containerView];
  
  self.animationView = [[LOTAnimationView alloc] initWithFrame:CGRectMake(70, 70, containerW - 140, containerH - 140)];
  [containerView addSubview:self.animationView];
  self.animationView.animation = @"gift_animation";
  
  self.animationView.loopAnimation = YES;
  
  UIButton *confirmButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 200, 34)];
  confirmButton.center = CGPointMake(self.animationView.center.x, containerH - 44);
  
  [confirmButton setTitle:@"Close" forState:UIControlStateNormal];
  [confirmButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
  
  [confirmButton setBackgroundColor:[UIColor blueColor]];
  confirmButton.layer.cornerRadius = 10;
  
  [confirmButton addTarget:self action:@selector(onConfirmButtonClick) forControlEvents:UIControlEventTouchUpInside];
  [containerView addSubview:confirmButton];
}

动画这里用到的是Lottie这个动画开源库(Airbnb),这个开源库主要的功能是可以将After Effects制作的动画通过插件导出为json格式的文件,然后通过这个开源库解析成动画。

- (void)onConfirmButtonClick
{
  if ([self.delegate respondsToSelector:@selector(onAirPodsAnimationViewControllerConfirmButtonClick:)]) {
    [self dismissViewControllerAnimated:YES completion:nil];
    [self.delegate onAirPodsAnimationViewControllerConfirmButtonClick:self];
  }
}

dissmiss当前的控制器,让viewController来实现这个代理方法,并且在代理方法中隐藏maskView

- (void)onAirPodsAnimationViewControllerConfirmButtonClick:(HCAirPodsAnimationViewController *)vc
{
  [UIView animateWithDuration:0.2 animations:^{
    self.maskBgView.alpha = 0.0;
  } completion:nil];
}

项目地址:AirPodsAnimation

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