How do I use uni-app's animation API?

How do I use uni-app's animation API?

To use uni-app's animation API, you need to follow these steps:

1. Create an Animation Instance: Begin by creating an animation instance using uni.createAnimation(options). The options parameter allows you to set default properties like duration, timing function, and delay.

   <code class="javascript">const animation = uni.createAnimation({
     duration: 1000,
     timingFunction: 'ease',
   });</code>

2. Define Animation Actions: Use the methods provided by the animation instance to define the actions you want to perform. Common methods include translate(), rotate(), scale(), and opacity(). These actions modify the properties of the animation instance.

   <code class="javascript">animation.translate(30, 30).rotate(45).scale(2, 2).step();</code>

3. Export the Animation Data: After defining the actions, you need to export the animation data to be used in your view. You can export the animation data by calling export() method of the animation instance.

   <code class="javascript">this.animationData = animation.export();</code>

4. Apply the Animation to a View: Finally, apply the exported animation data to the view using the animation property in the view's style.

   <code class="html"><view :animation="animationData">Animated View</view></code>

What are the key functions in uni-app's animation API?

The key functions in uni-app's animation API include:

• createAnimation(options): This function is used to create a new animation instance. The options object can include properties like duration, timingFunction, delay, and transformOrigin.
• translate(x, y): Moves the element by the specified x and y values.
• rotate(deg): Rotates the element by the specified degrees.
• scale(sx, [sy]): Scales the element. The sx value scales the element horizontally, and the optional sy value scales it vertically. If sy is not provided, it defaults to the sx value.
• opacity(value): Sets the opacity of the element, where value is a number between 0 and 1.
• step(options): Marks the end of one set of actions and allows you to start a new set with different properties. The options parameter can override the default properties of the animation.
• export(): Exports the current animation state so it can be applied to a view.

Can I combine multiple animations in uni-app?

Yes, you can combine multiple animations in uni-app using the step() method. This method allows you to segment your animation into different steps, each with its own set of properties and timing.

Here is an example of how to combine multiple animations:

<code class="javascript">const animation = uni.createAnimation();

animation.translate(30, 30).step({ duration: 300 });
animation.rotate(45).step({ duration: 300 });
animation.scale(2, 2).step({ duration: 300 });

this.animationData = animation.export();</code>

In this example, the element will first move 30 pixels to the right and 30 pixels down over 300 milliseconds, then rotate 45 degrees over the next 300 milliseconds, and finally scale to twice its size over another 300 milliseconds.

How do I control the timing of animations in uni-app?

To control the timing of animations in uni-app, you can use the following methods and properties:

• Duration: Set the duration property when creating the animation instance or within the step() method to control how long each segment of the animation lasts.

  <code class="javascript">const animation = uni.createAnimation({
    duration: 1000, // Default duration for all steps
  });
  
  animation.translate(30, 30).step({ duration: 500 }); // Override duration for this step</code>

• Timing Function: Use the timingFunction property to control the speed curve of the animation. Options include linear, ease, ease-in, ease-out, and ease-in-out.

  <code class="javascript">const animation = uni.createAnimation({
    timingFunction: 'ease-in-out',
  });</code>

• Delay: Use the delay property to add a delay before the animation starts.

  <code class="javascript">const animation = uni.createAnimation({
    delay: 500, // Delay the start of the animation by 500ms
  });</code>

• Step: Use the step() method to segment your animation into different steps, each with its own timing properties.

  <code class="javascript">animation.translate(30, 30).step({ duration: 300, timingFunction: 'ease-in' });
  animation.rotate(45).step({ duration: 300, timingFunction: 'ease-out' });</code>

By carefully setting these properties, you can precisely control the timing and flow of your animations in uni-app.

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