fix: dropdown animation in ios device

components/NormalTabs/NormalTabs.vue

 <template>
 	<view class="normal-tabs">
-		<u-tabs v-if="elementInfo.option.tabs.type === 'tabs'" :list="elementData.dataList.series" :is-scroll='elementData.dataList.series.length > 4'
+		<u-tabs v-if="elementInfo.option.tabs.type === 'tabs'" :list="elementData.dataList.series" 
+			:is-scroll='elementData.dataList.series.length > 4'
 			:current="currentTabs" :active-color="elementInfo.option.tabs.activeColor"
 			:inactive-color="elementInfo.option.tabs.color" :bg-color="elementInfo.option.tabs.backgroundColor"
 			:font-size="getFontSize()"	@change="handleTabsChange"></u-tabs>
@@ -35,9 +36,11 @@
 		</template>
 		
 		<u-dropdown v-if="elementInfo.option.tabs.type === 'dropdown'" :title-size="getFontSize()" ref="uDropdown"
-		 :active-color="elementInfo.option.tabs.color" :inactive-color="elementInfo.option.tabs.color" :menu-icon-size="getFontSize()" :height="elementInfo.height">
+		 :active-color="elementInfo.option.tabs.color" :inactive-color="elementInfo.option.tabs.color" 
+		 :menu-icon-size="getFontSize()" :height="getHeight()">
 			<u-dropdown-item v-model="tabsValue" :title="getSelectLabel(tabsValue)">
-				<view class="slot-content" :style="{'background-color': elementInfo.option.tabs.itemBackgroundColor}" v-for="(item, index) in elementData.dataList.series" :key="index">
+				<view class="slot-content" :style="{'background-color': elementInfo.option.tabs.itemBackgroundColor}" 
+					v-for="(item, index) in elementData.dataList.series" :key="index">
 					<view class="drop-item" @click="handleDropdownValue(item)"
 						:style="{
 							'color':tabsValue === item.value ? elementInfo.option.tabs.activeColor : elementInfo.option.tabs.color, 
@@ -242,6 +245,9 @@
 			},
 			getFontSize() {
 				return this.$u.common.pxToRpx(this.elementInfo.option.tabs.fontSize)
+			},
+			getHeight() {
+				return this.$u.common.pxToRpx(this.elementInfo.height)
 			}
 		},
 		watch: {

uview-ui/components/u-dropdown/u-dropdown.vue

@@ -134,7 +134,8 @@
 			popupStyle() {
 				let style = {};
 				// 进行Y轴位移，展开状态时，恢复原位。收齐状态时，往上位移100%，进行隐藏
-				style.transform = `translateY(${this.active ? 0 : '-100%'})`
+				// style.transform = `translateY(${this.active ? 0 : "-100%"})`;
+				style.transform = `scaleY(${this.active ? 1 : 0})`
 				style['transition-duration'] = this.duration / 1000 + 's';
 				style.borderRadius = `0 0 ${this.$u.addUnit(this.borderRadius)} ${this.$u.addUnit(this.borderRadius)}`;
 				return style;
@@ -291,6 +292,7 @@
 			&__popup {
 				position: relative;
 				z-index: 10;
+				transform-origin: center top;
 				transition: all  0.3s;
 				transform: translate3D(0, -100%, 0);
 				overflow: hidden;