React native:不透明视图内的透明视图 [英] React native: transparent view inside opaque view
本文介绍了React native:不透明视图内的透明视图的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我想用不透明的框架和透明的中心显示相机的视图。像图片中的东西(黑色部分是来自相机的视图)。我正在寻找具有纯反应原生组件的解决方案,没有额外的库(如
解决方案
我找到了简单的解决方案,我添加了查看
,内部透明,带有不透明边框,如下所示:
let {width,height} = Dimensions.get ('窗口');
<查看
style = {{
position:'absolute',
top:-width / 2 + 100,
left:-width / 2 + 50,
右:-width / 2 + 50,
底部:-width / 2 + 200,
backgroundColor:'transparent',
borderWidth :width / 2,
borderRadius:width,
borderColor:'red',
opacity:0.3,
}}
/>
I want to show view from camera with opaque frame and transparent center. Something like in the picture (black part is a view from camera). I'm looking for solution with pure react-native components, no additional libs (like https://github.com/gilbox/react-native-masked-view), without adding fullscreen image with transparent center or other hacks.
解决方案
I found simple solution, I added View
, transparent inside with opaque border, something like this:
let {width, height} = Dimensions.get('window');
<View
style={{
position: 'absolute',
top: -width/2 + 100,
left: -width/2 + 50,
right: -width/2 + 50,
bottom: -width/2 + 200,
backgroundColor: 'transparent',
borderWidth: width/2,
borderRadius: width,
borderColor: 'red',
opacity: 0.3,
}}
/>
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