uniapp dynamically sets the font to a uniform size

In mobile application development, UI design is a very important part. Among them, font size is a very important part because it directly affects the user's reading experience. In UniApp, we can set the font size dynamically in some simple ways to ensure application consistency.

First method: Set the global font size

To set the global font size, you can use the Vue.config.productionTip variable to set the global style when the application is initialized. Add the following code in App.vue:

export default {
    onLaunch: function() {
        Vue.config.productionTip = false
        uni.setGlobalStyle({
            'html,body': {
                fontSize: uni.upx2px(32) + 'px'
            }
        })
    }
}

Among them, uni.upx2px(32) converts 32upx to actual pixel size. This will use the default font size of 32 pixels.

If you need to change the font size, you can provide the option in the application's settings and store the user preferences locally. For example, user settings can be stored locally using the uni-storage component:

export default {
    methods: {
        onChangeFontSize: function(value) {
            uni.setStorageSync('font-size', value)
            uni.setGlobalStyle({
                'html,body': {
                    fontSize: uni.upx2px(value) + 'px'
                }
            })
        }
    }
}

Call this method on the page to set different font sizes selected by the user.

<uni-list>
    <uni-list-item v-for="(item, index) in fontSizes" :key="index" :title="item.title" :icon="item.value === currentFontSize ? 'checkmark' : ''" @click="onChangeFontSize(item.value)"></uni-list-item>
</uni-list>

Second method: Dynamically set font size according to component type

The second method is to set different font sizes for different components. For example, buttons and text boxes may require different font sizes. You can add the custom-style attribute to the component to style the component as follows:

<uni-button custom-style="font-size: 28upx;">My Button</uni-button>
<uni-input custom-style="font-size: 24upx;"></uni-input>

In this example, we set the button to a font size of 28upx and the text box to a font size of 24upx. Note again that we use upx instead of pixels to ensure a consistent look across devices of different sizes.

One disadvantage of this method is that you need to find all the components in the application that need to modify the font size and manually add the custom-style attribute. If the application is very large, this can become very cumbersome.

Conclusion

In summary, dynamically setting font size in UniApp is very simple. You can set the default font size globally and provide font size options in the application, or you can set the font size individually for each component. Either way, make sure you maintain a consistent look and feel across devices of different sizes to provide a better user experience.

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