How to use show hide animation in Uniapp

Uniapp is a cross-platform application development framework that allows developers to write code once in one code base and then compile it into multiple different applications. In Uniapp, developers can use different animation effects to improve the experience and user-friendliness of the application, such as showing and hiding animations. This article will introduce how to use show-hide animation in Uniapp.

1. Show and hide animation

In Uniapp, you can use the show and hide instructions to display and hide elements. The show directive is used to display elements, and the hide directive is used to hide elements. The specific usage is as follows:

1. Display element:

<div v-show="flag"></div>

2. Hidden element:

<div v-show="!flag"></div>

Among them, flag is a variable, When flag is true, the element is displayed, when flag is false, the element is hidden.

Showing and hiding animations can enhance the user experience and help users better understand the functions of the application. In Uniapp, you can use the transition component to implement show-hide animation.

2. Transition component

The transition component is a component used to achieve animation effects in Uniapp, which can help developers quickly add animation effects. It can apply different animation effects to the entry and exit of elements, such as fade effects, rotation effects, displacement effects, etc.

1. Usage

In Uniapp, the specific usage of using the transition component is as follows:

  <div v-show="flag"></div>

Among them, the name attribute is the name of the specified animation effect, fade Refers to the animation name, which can be customized according to the needs of the developer.

2. CSS Style

In order to achieve the animation effect, you also need to add the corresponding style to the CSS file. For example, in the above example, you need to add the fade style:

.fade-enter-active,
.fade-leave-active {
  transition: opacity .5s ease;
}

.fade-enter,
.fade-leave-to {
  opacity: 0;
}

Among them, .fade-enter-active and .fade-leave-active represent the visibility when the animation enters and leaves, and transition is used for Specify how long the animation takes, how it transitions, and how long it delays. .fade-enter and .fade-leave-to specify the transparency at the beginning and end of the animation. As needed, developers can customize and implement more different animation effects.

3. Summary

In Uniapp, the show-hide animation effect can be easily achieved through the show and hide instructions and the transition component. Developers only need to add the corresponding code in the HTML and CSS files to achieve it, without initiating too many resources and time.

But it should be noted that user experience and performance issues need to be taken into consideration during the implementation process. If the animation effect is too complex or takes a long time, it may cause the application to freeze or significantly reduce the performance of the application. Therefore, during use, it is necessary to reasonably control the complexity of the animation and test the performance and stability of the application.

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