iOS26 你们没有闪退吗？大佬啊，啥时候更新下库啊？

[chenailuo]

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

这里会闪退的。
*** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<UIKit._UINavigationBarVisualProviderModernIOSSwift 0x11f9f8a00> valueForUndefinedKey:]: this class is not key value coding-compliant for the key contentView.'
*** First throw call stack:

[MrChen-Git]

同样也是有这个问题，应该不止这一处

[fanruoyang]

这个问题 你后面如何处理了，我现在也遇到这种情况了

[Ambitiones]

这是 iOS 26 后 nav 的contentView 变更导致 KVC 找不到的问题, 具体目前只能 fork 分支自己修改, 或者你可以临时修改, 找到pods 文件中的:
`- (UIView *)qmui_contentView {
return [self valueForKeyPath:@"visualProvider.contentView"];
}

将该方法修改为:

• (UIView *)qmui_contentView {
  // return [self valueForKeyPath:@"visualProvider.contentView"];
  UIView *contentView = nil;
  if (@available(iOS 26.0, *)) {
  contentView = nil;
  } else {
  // 老版本走原来的方法，但是用 try 兜底
  @Try {
  contentView = [self valueForKeyPath:@"visualProvider.contentView"];
  } @catch (NSException *exception) {
  contentView = nil;
  }
  }
  if (contentView) {
  return contentView;
  }

   // 按类名查找 _UINavigationBarContentView
   Class class__NavigationBarContentView = NSClassFromString([NSString qmui_stringByConcat:@"_", @"UINavigationBar", @"ContentView", nil]);
   if (class__NavigationBarContentView) {
       contentView = [self subviewWithClass:class__NavigationBarContentView];
       if (contentView) {
           return contentView;
       }
   }
  
   // 按类名查找 UIKit.NavigationBarContentView
   Class class_UIKit_NavigationBarContentView = NSClassFromString(@"UIKit.NavigationBarContentView");
   if (class_UIKit_NavigationBarContentView) {
       contentView = [self subviewWithClass:class_UIKit_NavigationBarContentView];
       if (contentView) {
           return contentView;
       }
   }
  
   // 查找名字中包含 "ContentView" 的 view
   NSString *classNamePart_ContentView = @"ContentView";
   contentView = [self subviewWithClassNamePart:classNamePart_ContentView];
   if (contentView) {
       return contentView;
   }
  
   return nil;
  

  }

  • (UIView *)subviewWithClass:(Class)aClass {
    if (aClass) {
    for (UIView *sub in self.subviews) {
    if ([sub isKindOfClass:aClass]) {
    return sub;
    }
    // 有的系统层次里 contentView 不是直接子视图，尝试再向下查找一层
    for (UIView *sub2 in sub.subviews) {
    if ([sub2 isKindOfClass:aClass]) {
    return sub2;
    }
    }
    }
    }
    return nil;
    }

• (UIView *)subviewWithClassNamePart:(NSString *)classNamePart {
  for (UIView *sub in self.subviews) {
  NSString *className = NSStringFromClass(sub.class);
  if ([className containsString:classNamePart]) {
  return sub;
  }
  for (UIView *sub2 in sub.subviews) {
  NSString *className2 = NSStringFromClass(sub2.class);
  if ([className2 containsString:classNamePart]) {
  return sub2;
  }
  }
  }
  return nil;
  }`
  重新运行即可

[douxindong]

替换
- (UIView *)qmui_contentView{...}的实现:
↓
- (UIView *)qmui_contentView {
    // 优先尝试原始 KVC 方式（iOS 26 以下）
    if (@available(iOS 26.0, *)) {
        // iOS 26+ 不使用 KVC，走下面的兜底逻辑
    } else {
        @try {
            UIView *contentView = [self valueForKeyPath:@"visualProvider.contentView"];
            if (contentView) {
                return contentView;
            }
        } @catch (NSException *exception) {
            // KVC 失败，继续走兜底逻辑
            NSLog(@"QMUI: Failed to get contentView via KVC: %@", exception);
        }
    }
    
    // iOS 26+ 或 KVC 失败时的兜底方案
    UIView *contentView = [self qmui_findContentView];
    if (contentView) {
        return contentView;
    }
    
    return nil;
}

#pragma mark - Private Helper Methods

- (UIView *)qmui_findContentView {
    UIView *contentView = nil;
    
    // 1. 尝试 _UINavigationBarContentView（iOS 26 以下的老类名）
    Class contentViewClass = NSClassFromString(@"_UINavigationBarContentView");
    if (contentViewClass) {
        contentView = [self qmui_subviewWithClass:contentViewClass];
        if (contentView) return contentView;
    }
    
    // 2. 尝试 UIKit.NavigationBarContentView（Swift 风格的类名）
    contentViewClass = NSClassFromString(@"UIKit.NavigationBarContentView");
    if (contentViewClass) {
        contentView = [self qmui_subviewWithClass:contentViewClass];
        if (contentView) return contentView;
    }
    
    // 3. 模糊匹配类名中包含 "ContentView" 的视图
    contentView = [self qmui_subviewWithClassNamePart:@"ContentView"];
    if (contentView) return contentView;
    
    return nil;
}

- (UIView *)qmui_subviewWithClass:(Class)aClass {
    if (!aClass) return nil;
    
    for (UIView *subview in self.subviews) {
        if ([subview isKindOfClass:aClass]) {
            return subview;
        }
        // 某些系统版本中 contentView 不是直接子视图，需要向下查找一层
        for (UIView *subSubview in subview.subviews) {
            if ([subSubview isKindOfClass:aClass]) {
                return subSubview;
            }
        }
    }
    return nil;
}

- (UIView *)qmui_subviewWithClassNamePart:(NSString *)classNamePart {
    if (!classNamePart.length) return nil;
    
    for (UIView *subview in self.subviews) {
        NSString *className = NSStringFromClass([subview class]);
        if ([className containsString:classNamePart]) {
            return subview;
        }
        for (UIView *subSubview in subview.subviews) {
            NSString *subClassName = NSStringFromClass([subSubview class]);
            if ([subClassName containsString:classNamePart]) {
                return subSubview;
            }
        }
    }
    return nil;
}

@end