下面是一个示例代码，展示了如何使用Angular CDK和Angular自定义步进器来应用动画：

首先，安装Angular CDK和Angular自定义步进器：

npm install @angular/cdk
npm install @angular/material

在app.module.ts文件中导入所需的模块：

import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { ScrollingModule } from '@angular/cdk/scrolling';
import { MatStepperModule } from '@angular/material/stepper';

@NgModule({
  imports: [
    BrowserAnimationsModule,
    ScrollingModule,
    MatStepperModule
  ],
  ...
})
export class AppModule { }

在app.component.html文件中添加一个自定义步进器：

  
    Step 1
    Step 1 content
  
  
    Step 2
    Step 2 content
  
  
    Step 3
    Step 3 content
  

在app.component.ts文件中导入所需的模块和动画函数：

import { Component, ViewChild } from '@angular/core';
import { MatStepper } from '@angular/material/stepper';
import { AnimationEvent } from '@angular/animations';
import { stepperAnimation } from './stepper-animation';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css'],
  animations: [stepperAnimation]
})
export class AppComponent {
  @ViewChild('stepper') stepper: MatStepper;

  onAnimationDone(event: AnimationEvent) {
    if (event.toState === 'next') {
      this.stepper.next();
    } else if (event.toState === 'previous') {
      this.stepper.previous();
    }
  }
}

在app.component.css文件中定义动画：

@import '~@angular/material/theming';

.mat-horizontal-stepper {
  width: 400px;
  margin: 0 auto;
}

.mat-step-body {
  overflow: hidden;
}

.mat-step-body.ng-enter,
.mat-step-body.ng-leave {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
}

.mat-step-body.ng-enter {
  transform: translateX(100%);
  opacity: 0;
}

.mat-step-body.ng-leave {
  transform: translateX(-100%);
  opacity: 0;
}

.mat-step-body.ng-enter-active,
.mat-step-body.ng-leave-active {
  transition: all 300ms cubic-bezier(0.35, 0, 0.25, 1);
}

.mat-step-body.ng-enter-active {
  transform: translateX(0);
  opacity: 1;
}

.mat-step-body.ng-leave-active {
  transform: translateX(-100%);
  opacity: 0;
}

最后，在app.component.html文件的元素上添加动画触发器：

现在，当切换步进器时，动画将应用于步骤更改。