Simply check whether the flag indicating a change in font status has changed and then create the corresponding UITextField at that time.

检查表明字体状态变更的标记是否改变，然后创建一个对应的UITextField。

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When you change a font, you can create a new UITextField at the same time. Or, you can store the new font context and a flag indicating that fonts have changed.

在更改字体时，您可以同时创建一个新的UITextField，或者存储一个新的字体上下文和一个表明字体已经更改的标记。

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This overridden method illustrates how, if the flag is marked true, the real UITextField (textField) is updated, and the flag is reset to false for future markings.

这个被覆盖的方法演示了当标记被设置为true时，如何更新uitextfield (textField)，以及如何将该标记重新设置为false以在未来进行标记。

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