我想更改我的iOS应用程序中的searchBar调用的键盘的返回键的字符串标题。我想把标题从“搜索”改为“完成”。
我的searchBar是在UIView中以编程方式创建的。
我尝试将下面的代码片段放置在UIView的viewDidLoad（）或searchBar设置方法中（参见下面的错误报告）。

DispatchQueue.main.async {
    UITextField.appearance(whenContainedInInstancesOf: [UISearchBar.self]).returnKeyType = UIReturnKeyType.done
}

它无法在任何地方更改Return键的标题。此外，它奇怪地标记了一个错误，即我试图在MainThread之外设置返回类型，但显然不是这样。下面是错误：

2023-06-28 08:15:06.873302-0400 MyApp[28389:4455820] 
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', 
reason: 'Have you sent -setReturnKeyType: to 
    <UISearchBarTextField: 0x7fccbc856a00; 
    frame = (0 0; 0 0); opaque = NO; 
    gestureRecognizers = <NSArray: 0x600003807cc0>; 
    borderStyle = RoundedRect; 
    background = <_UITextFieldSystemBackgroundProvider: 
      0x60000355eb40: 
       backgroundView=<_UISearchBarSearchFieldBackgroundView: 
         0x7fccbc75d020; 
       frame = (0 0; 0 0); 
       opaque = NO; autoresize = W+H; 
       userInteractionEnabled = NO; 
       backgroundColor = <UIDynamicSystemColor: 0x60000218fd00; 
       name = tertiarySystemFillColor>; 
       layer = <CALayer: 0x60000355ef00>>, 
    fillColor=(null), 
    textfield=<UISearchBarTextField 0x7fccbc856a00>>; 
  layer = <CALayer: 0x60000355fa80>> 

off the main thread?

要进行验证，请在日志中查找投诉：“UIKit的使用不受支持..."，如果发现问题，请修复该问题。如果你只使用主线程，请在UIKit上提交一个雷达，并附上这个日志。exercisedImplementations = {“setReturnKeyType：“=（）;}
有什么想法吗我们都知道，雷达需要几个星期到几个月，如果有的话。
SearchBar设置方法：

func setupSearchBar() -> Void {
    myBar = UISearchBar()
    myBar.searchBarStyle = .prominent
    myBar.sizeToFit()
    myBar.isTranslucent = false
    myBar.delegate = self
    self.addSubview(myBar)
    myBar.translatesAutoresizingMaskIntoConstraints = false
    let barLeft = myBar.leftAnchor.constraint(equalTo: self.leftAnchor, constant: 0)
    let barRight = myBar.rightAnchor.constraint(equalTo: self.rightAnchor, constant: 0)
    let barTop = myBar.topAnchor.constraint(equalTo: topAnchor, constant: 0)
    let barHeight = myBar.heightAnchor.constraint(equalToConstant: 40.0)
    let barWidth = myBar.widthAnchor.constraint(greaterThanOrEqualToConstant: 220.0)
    barRight.priority = UILayoutPriority(998.0)
    barLeft.isActive = true
    barRight.isActive = true
    barTop.isActive = true
    barHeight.isActive = true
    barWidth.isActive = true
    DispatchQueue.main.async {
        UITextField.appearance(whenContainedInInstancesOf: [UISearchBar.self]).returnKeyType = UIReturnKeyType.done
    }
}