英文:
How does react-native-measure-text calculate height
问题
我想测量react-native中文本组件的高度，而不需要在屏幕上布局它。
react-native-measure-text可以用于此目的，但这个库是如何计算的。
英文:
I want to measure the height of a text component in react-native without laying it out on screen.
react-native-measure-text can be used for this, but how does this library calculates it.
答案1
得分: 2
它创建一个具有与您要测量的文本组件相同属性的 Text 组件，然后将 onLayout 属性设置为一个函数，该函数在渲染 Text 组件时捕获布局信息。布局信息包括组件的高度和宽度，可用于计算文本的高度。渲染带有 onLayout 的 Text 组件后，react-native-measure-text 会从屏幕上删除该组件，但保留其布局信息。然后，它将组件的高度返回给您，使您能够测量原始文本组件的高度，而无需实际在屏幕上渲染它。
英文:
It creates a Text component with the same properties as the one you want to measure, and then sets the onLayout prop to a function that captures the layout information of the Text component when it is rendered. The layout information includes the height and width of the component, which can be used to calculate the height of the text.
After rendering the Text component with onLayout, react-native-measure-text removes the component from the screen, but retains its layout information. It then returns the height of the component to you, allowing you to measure the height of the original text component without actually rendering it on the screen.
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