创建setIOSAreaMixin.js文件

import {
	mapState,
	mapMutations
} from 'vuex'

export default {
	computed: {
		...mapState("ios_area", ["globalAreaClass", 'isSafeAreaCalculated'])
	},
	mounted() {
		if (!this.isSafeAreaCalculated) {
			this.calculateSafeAreaClass();
			this.setSafeAreaCalculated(true)
		}
	},

	methods: {
		...mapMutations("ios_area", ["setSafeAreaCalculated", 'setGlobalClass']),
		calculateSafeAreaClass() {
			// 获取设备信息
			let result =  uni.getSystemInfoSync().osName
			// 判断设备类型
			if (result == 'ios' ) {
				// 计算安全区域类名
				
				const safeAreaClass = 'setIosArea'; // 根据你的需求定义类名
				// 更新 Vuex 中的数据

				this.setGlobalClass(safeAreaClass)
			} else {
				// 非iOS设备时清空类名

				this.setGlobalClass('')
			}
		},
	},
};import {
	mapState,
	mapMutations
} from 'vuex'

export default {
	computed: {
		...mapState("ios_area", ["globalAreaClass", 'isSafeAreaCalculated'])
	},
	mounted() {
		if (!this.isSafeAreaCalculated) {
			this.calculateSafeAreaClass();
			this.setSafeAreaCalculated(true)
		}
	},

	methods: {
		...mapMutations("ios_area", ["setSafeAreaCalculated", 'setGlobalClass']),
		calculateSafeAreaClass() {
			// 获取设备信息
			let result =  uni.getSystemInfoSync().osName
			// 判断设备类型
			if (result == 'ios' ) {
				// 计算安全区域类名
				
				const safeAreaClass = 'setIosArea'; // 根据你的需求定义类名
				// 更新 Vuex 中的数据

				this.setGlobalClass(safeAreaClass)
			} else {
				// 非iOS设备时清空类名

				this.setGlobalClass('')
			}
		},
	},
};

Vuex中存储

export default {
	namespaced: true,
	state: {
		isSafeAreaCalculated: false,
		globalAreaClass: '',
	},
	mutations: {
		setSafeAreaCalculated(state, value) {
			state.isSafeAreaCalculated = value;
		},
		setGlobalClass(state, value) {
			state.globalAreaClass = value;
		},
	},
}

main.js中全局混入

import setIOSAreaMixin from './mixin/setIOSAreaMixin'
Vue.mixin(setIOSAreaMixin);

 页面中使用

<view class="footer"  :class="globalAreaClass">
			<u-button type="warning" :custom-style="customStyle" hover-class="none" @click="chongZhi">确认充值</u-button>
		</view>

css

.setIosArea {
		padding-bottom: calc(constant(safe-area-inset-bottom)/(1.5)) !important;
		padding-bottom: calc(env(safe-area-inset-bottom)/(1.5)) !important;

	}