如何在页面已加载后，如何在uitextfied中设置值
我有一个本机iOS项目，我们在其中整合了React Native。在这里，我们有一个本机iOS（Swift）和屏幕B中的屏幕A中的反应本地。 当用户在屏幕中时，单击组件并导航到屏幕B。在屏幕B中，用户选择一个选项并将该值传递给使用NativeModules之间的两个部分之间的brigde。 在该屏幕B被解散之后，用户再次能够看到屏幕A。可以在屏幕上的函数中访问通过桥梁的值，但是当试图将该值设置为UITEXTFIELD获取错误时 ：在隐式解开可选值时，意外发现了nil
线程1：致命错误
I have a native iOS project in which we have integrated react native. Here we have a screen A in native iOS(swift) and screen B in React-native.
When user is in screen A clicks on component and navigated to screen B. Inside screen B then user selects a option and passes that value to brigde between the two parts using NativeModules.
After that screen B gets dismissed and user is again able to see the screen A. The value which is passed through bridge can be accessed inside a function in screen A view controller, but when trying to set that value to UITextField getting error Thread 1: Fatal error: Unexpectedly found nil while implicitly unwrapping an Optional value
Expecting to set the value which is received from screen B in screen A gets saved in UITextField to be utilised further
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这意味着您尝试使用零的对象。
例如，您有一个TextField对象（Uitextfield的类型），并且您尝试使用：
尚未初始化Textfield。没有代码，很难说出什么问题，但是要么您之前应该在某个地方进行过启动文本字段：
或者您应该安全地解开字段，然后尝试设置该值 - 如果零，则仍然不会设置它。
This means that you tried to use an object which is nil.
E.g. you had a textField object (type of UITextField) and you tried to use:
Your textField is not yet initialized. Without code it's hard to say what's wrong but either you should have initilaized textField somewhere before:
Or you should safely unwrap the field and try to set the value - if it's nil it still won't be set.