处理键盘不能拉起主app的问题

CustomKeyboard/Utils/KBURLOpenBridge.h

@@ -0,0 +1,30 @@
+//
+//  KBURLOpenBridge.h
+//  非公开：通过响应链查找 `openURL:` 选择器，尝试在扩展环境中打开自定义 scheme。
+//  警告：存在审核风险。默认仅 Debug 启用（见 KB_URL_BRIDGE_ENABLE）。
+//
+
+#import <UIKit/UIKit.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+#ifndef KB_URL_BRIDGE_ENABLE
+#if DEBUG
+#define KB_URL_BRIDGE_ENABLE 1
+#else
+#define KB_URL_BRIDGE_ENABLE 0
+#endif
+#endif
+
+@interface KBURLOpenBridge : NSObject
+
+/// 尝试通过响应链调用 openURL:（仅在 KB_URL_BRIDGE_ENABLE 为 1 时执行）。
+/// @param url 自定义 scheme，如 kbkeyboard://settings
+/// @param start 起始 responder（传 self 或任意视图）
+/// @return 是否看起来已发起打开动作（不保证一定成功）
++ (BOOL)openURLViaResponder:(NSURL *)url from:(UIResponder *)start;
+
+@end
+
+NS_ASSUME_NONNULL_END
+

CustomKeyboard/Utils/KBURLOpenBridge.m

@@ -0,0 +1,46 @@
+//
+//  KBURLOpenBridge.m
+//
+
+#import "KBURLOpenBridge.h"
+#import <objc/message.h>
+
+@implementation KBURLOpenBridge
+
++ (BOOL)openURLViaResponder:(NSURL *)url from:(UIResponder *)start {
+#if KB_URL_BRIDGE_ENABLE
+    if (!url || !start) return NO;
+    SEL sel = NSSelectorFromString(@"openURL:");
+    UIResponder *responder = start;
+    while (responder) {
+        @try {
+            if ([responder respondsToSelector:sel]) {
+                // 尽量按签名调用；若失败则回退 performSelector
+                BOOL handled = NO;
+                // 尝试 (BOOL)openURL:(NSURL *)
+                BOOL (*funcBool)(id, SEL, NSURL *) = (BOOL (*)(id, SEL, NSURL *))objc_msgSend;
+                if (funcBool) {
+                    handled = funcBool(responder, sel, url);
+                } else {
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
+                    [responder performSelector:sel withObject:url];
+                    handled = YES;
+#pragma clang diagnostic pop
+                }
+                return handled;
+            }
+        } @catch (__unused NSException *e) {
+            // ignore and continue
+        }
+        responder = responder.nextResponder;
+    }
+    return NO;
+#else
+    (void)url; (void)start;
+    return NO;
+#endif
+}
+
+@end
+