1

CustomKeyboard/View/KBKeyboardView.m

@@ -6,6 +6,7 @@
 #import "KBKeyboardView.h"
 #import "KBKeyButton.h"
 #import "KBKey.h"
+#import "KBResponderUtils.h" // 封装的响应链工具
 
 @interface KBKeyboardView ()
 @property (nonatomic, strong) UIView *row1;
@@ -13,6 +14,8 @@
 @property (nonatomic, strong) UIView *row3;
 @property (nonatomic, strong) UIView *row4;
 @property (nonatomic, strong) NSArray<NSArray<KBKey *> *> *keysForRows;
+// 长按退格的一次次删除控制标记（不使用 NSTimer，仅用 GCD 递归调度）
+@property (nonatomic, assign) BOOL backspaceHoldActive;
 @end
 
 @implementation KBKeyboardView
@@ -196,6 +199,16 @@
         [btn addTarget:self action:@selector(onKeyTapped:) forControlEvents:UIControlEventTouchUpInside];
         [row addSubview:btn];
 
+        // ⌫ 长按：开始连续逐个删除（无需 NSTimer）。使用 UILongPressGestureRecognizer 识别长按，
+        // 在开始态触发递归的轻量调度，每次删除 1 个字符，直到松手或无内容。
+        if (key.type == KBKeyTypeBackspace) {
+            UILongPressGestureRecognizer *lp = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(onBackspaceLongPress:)];
+            // 稍短的判定时间，提升响应（默认约 0.5s）。
+            lp.minimumPressDuration = 0.35;
+            lp.cancelsTouchesInView = YES; // 被识别为长按时，取消普通点击
+            [btn addGestureRecognizer:lp];
+        }
+
         // Shift 按钮选中态随大小写状态变化
         if (key.type == KBKeyTypeShift) {
             btn.selected = self.shiftOn;
@@ -293,6 +306,42 @@
     }
 }
 
+// 长按退格：按住时以小间隔逐个删除；松手停止。（不使用 NSTimer/DisplayLink）
+- (void)onBackspaceLongPress:(UILongPressGestureRecognizer *)gr {
+    switch (gr.state) {
+        case UIGestureRecognizerStateBegan: {
+            self.backspaceHoldActive = YES;
+            [self kb_backspaceStep];
+        } break;
+        case UIGestureRecognizerStateEnded:
+        case UIGestureRecognizerStateCancelled:
+        case UIGestureRecognizerStateFailed: {
+            self.backspaceHoldActive = NO;
+        } break;
+        default: break;
+    }
+}
+
+#pragma mark - Helpers
+
+// 单步删除并在需要时安排下一次，直到松手或无内容
+- (void)kb_backspaceStep {
+    if (!self.backspaceHoldActive) { return; }
+    UIInputViewController *ivc = KBFindInputViewController(self);
+    if (!ivc) { self.backspaceHoldActive = NO; return; }
+    id<UITextDocumentProxy> proxy = ivc.textDocumentProxy;
+    NSString *before = proxy.documentContextBeforeInput ?: @"";
+    if (before.length <= 0) { self.backspaceHoldActive = NO; return; }
+    [proxy deleteBackward]; // 每次仅删 1 个
+
+    // 轻量递归调度下一次；不使用 NSTimer，避免复杂状态管理
+    __weak typeof(self) weakSelf = self;
+    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.06 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
+        __strong typeof(weakSelf) selfStrong = weakSelf;
+        [selfStrong kb_backspaceStep];
+    });
+}
+
 #pragma mark - Lazy
 
 - (UIView *)row1 { if (!_row1) _row1 = [UIView new]; return _row1; }