如何设置APP内全局字体大小

问题现象
在文本量多而杂的场景下，单独给每个Text文本设置字体大小效率不高，有什么方法能够设置APP内的全局字体大小？以便统一设置字体大小，提高效率。

背景知识
动态属性是动态设置组件的属性，支持开发者在属性设置时使用if/else语法，且根据需要使用多态样式设置属性。其属性方法AttributeModifier支持在当前组件上动态设置属性方法。
Text文本组件中的fontSize属性可以设置字体大小，fontFamily属性可以设置字体列表。
接口ApplicationContext.setFontSizeScale设置应用字体大小缩放比例。仅支持主线程调用。当应用字体设置为跟随系统时，通过配置configuration标签就可以设置应用字体大小跟随系统变化的比例。
解决方案
方案一：通过preferences调节应用内全局字体大小。
自定义PreferencesUtil类，通过其提供的创建、保存和查询的数据，将读取到的数据保存到页面带有@State的变量中，通过状态变量对文本字体大小进行设置。具体应用可以参考官网使用preferences实现应用内字体大小调节功能。

方案二：通过动态属性设置全局字体大小。
使用动态属性，自定义class实现AttributeModifier接口，设定好Text需要的fontSize后在页面调用，实现字体大小统一修改。

class MyTextModifier implements AttributeModifier<TextAttribute> {
public isDark: boolean = false;

applyNormalAttribute(instance: TextAttribute): void {
if (this.isDark) {
instance.fontSize(100);
} else {
instance.fontSize(50);
}
}
}

@Entry
@Component
struct Index {
private message: string = 'test';
@State modifier: MyTextModifier = new MyTextModifier();

build() {
Column() {
Text(this.message)
.attributeModifier(this.modifier)
.onClick(() => {
this.modifier.isDark = !this.modifier.isDark;
});
Blank();
Text(this.message)
.attributeModifier(this.modifier)
.onClick(() => {
this.modifier.isDark = !this.modifier.isDark;
});
}
.padding(24)
.width('100%')
.height('100%');
}
}
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