How does uniapp realize the animation effect of water ripples when clicked?

In mobile application interface design, interaction is a crucial aspect. As a very popular interactive feedback method, the water ripple effect is widely used in different mobile applications. This article will introduce how to implement the water ripple animation effect when clicked under the UniApp framework.

First of all, let’s understand how the water ripple effect is achieved. The water ripple effect is essentially a wave of circular ripples radiated from a circular diffusion, similar to the ripples in the water caused by throwing a stone. When the click event occurs, we can create a circle at the click location and gradually change its size and opacity to make it look like a spreading ripple effect.

There are many ways to achieve this effect under the UniApp framework. Below we will introduce two common implementation methods.

The first method: using CSS styles

Using CSS styles to achieve the water ripple effect is a relatively simple way. First add a pseudo class on the element that triggers the click event, such as :active. Then use the transform, transition and opacity properties of CSS3 to control changes in the size, position and opacity of the element to achieve the effect of water ripples.

For example, we can add the following code to the style sheet:

.button:active {
  position: relative;
}
.button:active::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background-color: rgba(0, 0, 0, 0.2);
  border-radius: 100%;
  transform: translate(-50%, -50%) scale(0, 0);
  opacity: 1;
  transition: all 0.3s ease-out;
}

.button:active::after {
  width: 200px;
  height: 200px;
  opacity: 0;
  transform: translate(-50%, -50%) scale(1, 1);
}

When the click event is triggered, add the :active class name to achieve the above CSS style defined effect.

Second method: Use plug-ins

In addition to using CSS styles, we can also use plug-ins to achieve the water ripple effect. Under the UniApp framework, there are already some plug-ins to achieve water ripple effects, such as Mescroll-uni and uview-ui.

Take uview-ui as an example, just add the @click.native="ripple" event to the component that needs to use the water ripple effect, for example:

<view @click.native="ripple">Click me!</view>

In this simple and clear way, we can achieve the animation of water ripple effects.

Summary

As a very popular interactive feedback method, the water ripple effect is crucial to improving the user experience of mobile applications. Under the UniApp framework, we can easily animate water ripple effects by using CSS styles or plug-ins. Hope this article can help you.

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