4

keyBoard/Class/Base/VC/BaseNavigationController.h

@@ -11,6 +11,11 @@ NS_ASSUME_NONNULL_BEGIN
 
 @interface BaseNavigationController : UINavigationController
 
+/// Push 一个 VC，如果栈中已存在同 class 的 VC，则先移除旧的，再 push 新的。
+/// 常用于类似“登录/注册”这类会互相跳转的页面，避免堆叠多个相同页面实例。
+- (void)kb_pushViewControllerRemovingSameClass:(UIViewController *)viewController
+                                       animated:(BOOL)animated;
+
 @end
 
 NS_ASSUME_NONNULL_END

keyBoard/Class/Base/VC/BaseNavigationController.m

@@ -41,4 +41,42 @@
     [super pushViewController:viewController animated:animated];
 }
 
+/// Push 一个 VC，若栈中已存在相同 class 的 VC，则先移除旧的再 push 新的。
+- (void)kb_pushViewControllerRemovingSameClass:(UIViewController *)viewController
+                                       animated:(BOOL)animated {
+    if (!viewController) { return; }
+
+    NSMutableArray<UIViewController *> *stack = self.viewControllers.mutableCopy;
+    // 移除同 class 的旧 VC（通常只有一个，这里按需移除第一个）
+    UIViewController *toRemove = nil;
+    for (UIViewController *vc in stack) {
+        if ([vc isKindOfClass:[viewController class]]) {
+            toRemove = vc;
+            break;
+        }
+    }
+    if (toRemove) {
+        [stack removeObject:toRemove];
+    }
+
+    // 追加新 VC
+    [stack addObject:viewController];
+
+    // 对前一个 VC 做统一的返回按钮样式处理，与 pushViewController: 保持一致
+    if (stack.count > 1) {
+        viewController.hidesBottomBarWhenPushed = YES;
+        UIViewController *prev = stack[stack.count - 2];
+        if (@available(iOS 14.0, *)) {
+            prev.navigationItem.backButtonDisplayMode = UINavigationItemBackButtonDisplayModeMinimal;
+        } else {
+            prev.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@""
+                                                                                      style:UIBarButtonItemStylePlain
+                                                                                     target:nil
+                                                                                     action:nil];
+        }
+    }
+
+    [self setViewControllers:stack animated:animated];
+}
+
 @end

keyBoard/Class/Login/VC/KBEmailLoginVC.m

@@ -6,6 +6,7 @@
 //
 
 #import "KBEmailLoginVC.h"
+#import "KBEmailRegistVC.h"
 
 @interface KBEmailLoginVC () <UITextViewDelegate, UITextFieldDelegate>
 
@@ -225,6 +226,13 @@
 
 - (void)onTapSignUp {
     KBLOG(@"KBEmailLoginVC onTapSignUp");
+    KBEmailRegistVC *vc = [[KBEmailRegistVC alloc] init];
+    UINavigationController *nav = KB_CURRENT_NAV;
+    if ([nav isKindOfClass:[BaseNavigationController class]]) {
+        [(BaseNavigationController *)nav kb_pushViewControllerRemovingSameClass:vc animated:YES];
+    } else {
+        [nav pushViewController:vc animated:YES];
+    }
 }
 
 - (void)onTapTogglePassword:(UIButton *)sender {

keyBoard/Class/Login/VC/KBEmailRegistVC.m

@@ -324,8 +324,12 @@
 - (void)onTapEmailLogin {
     KBLOG(@"onTapEmailLogin in KBEmailRegistVC");
     KBEmailLoginVC *vc = [[KBEmailLoginVC alloc] init];
-    [KB_CURRENT_NAV pushViewController:vc animated:true];
-
+    UINavigationController *nav = KB_CURRENT_NAV;
+    if ([nav isKindOfClass:[BaseNavigationController class]]) {
+        [(BaseNavigationController *)nav kb_pushViewControllerRemovingSameClass:vc animated:YES];
+    } else {
+        [nav pushViewController:vc animated:YES];
+    }
 }
 
 #pragma mark - Agreement Tap

keyBoard/Class/Login/VC/KBForgetPwdVC.h

@@ -0,0 +1,16 @@
+//
+//  KBForgetPwdVC.h
+//  keyBoard
+//
+//  Created by Mac on 2025/12/3.
+//
+
+#import <UIKit/UIKit.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface KBForgetPwdVC : UIViewController
+
+@end
+
+NS_ASSUME_NONNULL_END

keyBoard/Class/Login/VC/KBForgetPwdVC.m

@@ -0,0 +1,31 @@
+//
+//  KBForgetPwdVC.m
+//  keyBoard
+//
+//  Created by Mac on 2025/12/3.
+//
+
+#import "KBForgetPwdVC.h"
+
+@interface KBForgetPwdVC ()
+
+@end
+
+@implementation KBForgetPwdVC
+
+- (void)viewDidLoad {
+    [super viewDidLoad];
+    // Do any additional setup after loading the view.
+}
+
+/*
+#pragma mark - Navigation
+
+// In a storyboard-based application, you will often want to do a little preparation before navigation
+- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
+    // Get the new view controller using [segue destinationViewController].
+    // Pass the selected object to the new view controller.
+}
+*/
+
+@end

keyBoard/Class/Login/VC/KBLoginVC.m

@@ -190,7 +190,12 @@
     // 后续接入邮箱登录逻辑
     KBLOG(@"onTapEmailLogin");
     KBEmailLoginVC *vc = [[KBEmailLoginVC alloc] init];
-    [KB_CURRENT_NAV pushViewController:vc animated:true];
+    UINavigationController *nav = KB_CURRENT_NAV;
+    if ([nav isKindOfClass:[BaseNavigationController class]]) {
+        [(BaseNavigationController *)nav kb_pushViewControllerRemovingSameClass:vc animated:YES];
+    } else {
+        [nav pushViewController:vc animated:YES];
+    }
 }
 
 - (void)onTapPolicy {
@@ -202,7 +207,12 @@
     // 打开注册页
     KBLOG(@"onTapSignUp");
     KBEmailRegistVC *vc = [[KBEmailRegistVC alloc] init];
-    [KB_CURRENT_NAV pushViewController:vc animated:true];
+    UINavigationController *nav = KB_CURRENT_NAV;
+    if ([nav isKindOfClass:[BaseNavigationController class]]) {
+        [(BaseNavigationController *)nav kb_pushViewControllerRemovingSameClass:vc animated:YES];
+    } else {
+        [nav pushViewController:vc animated:YES];
+    }
 }
 
 - (void)onTapForgotPassword {