测试配置

CustomKeyboard/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>NSExtension</key>
+	<dict>
+		<key>NSExtensionAttributes</key>
+		<dict>
+			<key>IsASCIICapable</key>
+			<false/>
+			<key>PrefersRightToLeft</key>
+			<false/>
+			<key>PrimaryLanguage</key>
+			<string>en-US</string>
+			<key>RequestsOpenAccess</key>
+			<false/>
+		</dict>
+		<key>NSExtensionPointIdentifier</key>
+		<string>com.apple.keyboard-service</string>
+		<key>NSExtensionPrincipalClass</key>
+		<string>KeyboardViewController</string>
+	</dict>
+</dict>
+</plist>

CustomKeyboard/KeyboardViewController.h

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+//
+//  KeyboardViewController.h
+//  CustomKeyboard
+//
+//  Created by Mac on 2025/10/27.
+//
+
+#import <UIKit/UIKit.h>
+
+@interface KeyboardViewController : UIInputViewController
+
+@end

CustomKeyboard/KeyboardViewController.m

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+//
+//  KeyboardViewController.m
+//  CustomKeyboard
+//
+//  Created by Mac on 2025/10/27.
+//
+
+#import "KeyboardViewController.h"
+
+static CGFloat KEYBOARDHEIGHT = 256;
+
+@interface KeyboardViewController ()
+@property (nonatomic, strong) UIButton *nextKeyboardButton;
+@end
+
+@implementation KeyboardViewController
+
+- (void)updateViewConstraints {
+    [super updateViewConstraints];
+    
+    // Add custom view sizing constraints here
+}
+
+- (void)viewDidLoad {
+    [super viewDidLoad];
+//    
+//    // Perform custom UI setup here
+//    self.nextKeyboardButton = [UIButton buttonWithType:UIButtonTypeSystem];
+//    
+//    [self.nextKeyboardButton setTitle:NSLocalizedString(@"Next Keyboard", @"Title for 'Next Keyboard' button") forState:UIControlStateNormal];
+//    [self.nextKeyboardButton sizeToFit];
+//    self.nextKeyboardButton.translatesAutoresizingMaskIntoConstraints = NO;
+//    
+//    [self.nextKeyboardButton addTarget:self action:@selector(handleInputModeListFromView:withEvent:) forControlEvents:UIControlEventAllTouchEvents];
+//    
+//    [self.view addSubview:self.nextKeyboardButton];
+//    
+//    [self.nextKeyboardButton.leftAnchor constraintEqualToAnchor:self.view.leftAnchor].active = YES;
+//    [self.nextKeyboardButton.bottomAnchor constraintEqualToAnchor:self.view.bottomAnchor].active = YES;
+    
+    [self setupUI];
+}
+
+
+- (void)setupUI {
+    CGFloat toolBarHeight = 40;
+    CGFloat bottom = 5;
+    CGFloat buttonSpace = 8;
+    CGFloat eachButtonHeight = (KEYBOARDHEIGHT - toolBarHeight - 10 - 8 * 3 - bottom) / 4;
+    
+    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, 30)];
+    view.backgroundColor = [UIColor redColor];
+    [self.view addSubview:view];
+}
+
+
+- (void)viewWillLayoutSubviews
+{
+    self.nextKeyboardButton.hidden = !self.needsInputModeSwitchKey;
+    [super viewWillLayoutSubviews];
+}
+
+- (void)textWillChange:(id<UITextInput>)textInput {
+    // The app is about to change the document's contents. Perform any preparation here.
+}
+
+- (void)textDidChange:(id<UITextInput>)textInput {
+    // The app has just changed the document's contents, the document context has been updated.
+    
+    UIColor *textColor = nil;
+    if (self.textDocumentProxy.keyboardAppearance == UIKeyboardAppearanceDark) {
+        textColor = [UIColor whiteColor];
+    } else {
+        textColor = [UIColor blackColor];
+    }
+    [self.nextKeyboardButton setTitleColor:textColor forState:UIControlStateNormal];
+}
+
+@end

CustomKeyboard/PrefixHeader.pch

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+//
+//  PrefixHeader.pch
+//  CustomKeyboard
+//
+//  Created by Mac on 2025/10/27.
+//
+
+#ifndef PrefixHeader_pch
+#define PrefixHeader_pch
+
+// Include any system framework and library headers here that should be included in all compilation units.
+// You will also need to set the Prefix Header build setting of one or more of your targets to reference this file.
+
+#define SCREEN_WIDTH  [UIScreen mainScreen].bounds.size.width
+#define SCREEN_HEIGHT [UIScreen mainScreen].bounds.size.width
+#define imageNamed(s) [UIImage imageNamed:s]
+
+#endif /* PrefixHeader_pch */

CustomKeyboard/View/KBToolBar.h

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+//
+//  KBToolBar.h
+//  CustomKeyboard
+//
+//  Created by Mac on 2025/10/27.
+//
+
+#import <UIKit/UIKit.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface KBToolBar : UIView
+
+@end
+
+NS_ASSUME_NONNULL_END

CustomKeyboard/View/KBToolBar.m

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+//
+//  KBToolBar.m
+//  CustomKeyboard
+//
+//  Created by Mac on 2025/10/27.
+//
+
+#import "KBToolBar.h"
+
+@implementation KBToolBar
+
+/*
+// Only override drawRect: if you perform custom drawing.
+// An empty implementation adversely affects performance during animation.
+- (void)drawRect:(CGRect)rect {
+    // Drawing code
+}
+*/
+
+@end