iOS26 UINavigationBar+QMUI.m中的qmui_contentView这里闪退

[liuteng000]

UINavigationBar+QMUI.m文件中的这里闪退：

• (UIView *)qmui_contentView {
  return [self valueForKeyPath:@"visualProvider.contentView"];
  }

*** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<UIKit._UINavigationBarVisualProviderModernIOSSwift 0x108a0f0c0> valueForUndefinedKey:]: this class is not key value coding-compliant for the key contentView.'
*** First throw call stack:

[morricd]

• (UIView *)qmui_contentView {
  UIView *contentView = nil;

  if (@available(iOS 18.0, *)) {
  // iOS 18 及以上使用新方法（遍历 subviews）
  contentView = [self findContentViewInSubviews_iOS18];
  } else {
  // iOS 17 及以下使用旧方法（KVC）
  @Try {
  contentView = [self valueForKeyPath:@"visualProvider.contentView"];
  } @catch (NSException *exception) {
  NSLog(@"KVC failed: %@", exception.reason);
  contentView = [self findContentViewInSubviews_iOS18];
  }
  }

  return contentView ?: self;
  }

// iOS 18+ 的新实现

• (UIView *)findContentViewInSubviews_iOS18 {
  for (UIView *subview in self.subviews) {
  NSString *className = NSStringFromClass([subview class]);
  if ([className containsString:@"ContentView"] ||
  [className containsString:@"BarContentView"]) {
  return subview;
  }
  }
  return self.subviews.firstObject;
  }