修复西班牙语bug

CustomKeyboard/View/KBKeyboardView.m

@@ -127,6 +127,9 @@ static const CGFloat kKBLettersRow2EdgeSpacerMultiplier = 0.5;
     }
 
     KBKeyboardLayout *layout = [self kb_currentLayout];
+    NSLog(@"[KBKeyboardView] reloadKeys: layoutName=%@ rows=%lu shiftRows=%lu shiftOn=%d",
+          self.currentLayoutJsonId, (unsigned long)layout.rows.count, (unsigned long)layout.shiftRows.count, self.shiftOn);
+    
     NSArray<KBKeyboardRowConfig *> *rows = nil;
     
     if (self.shiftOn && layout.shiftRows.count > 0) {
@@ -135,7 +138,10 @@ static const CGFloat kKBLettersRow2EdgeSpacerMultiplier = 0.5;
         rows = layout.rows ?: @[];
     }
     
+    NSLog(@"[KBKeyboardView] reloadKeys: usingRows=%lu", (unsigned long)rows.count);
+    
     if (rows.count < 4) {
+        NSLog(@"[KBKeyboardView] reloadKeys: rows.count < 4, fallback to legacy");
         [self kb_buildLegacyLayout];
         return;
     }
@@ -146,6 +152,7 @@ static const CGFloat kKBLettersRow2EdgeSpacerMultiplier = 0.5;
     [self buildRow:self.row4 withRowConfig:rows[3]];
 
     NSUInteger totalButtons = [self kb_totalKeyButtonCount];
+    NSLog(@"[KBKeyboardView] reloadKeys: totalButtons=%lu", (unsigned long)totalButtons);
     if (totalButtons == 0) {
         NSLog(@"[KBKeyboardView] config layout produced no keys, fallback to legacy.");
         for (UIView *row in @[self.row1, self.row2, self.row3, self.row4]) {
@@ -376,7 +383,7 @@ static const CGFloat kKBLettersRow2EdgeSpacerMultiplier = 0.5;
 
 // 字母键工厂：根据 shiftOn 决定显示与输出大小写
 - (KBKey *)kb_letterKeyWithChar:(NSString *)charString {
-    NSParameterAssert(charString.length == 1);
+    if (charString.length == 0) { return nil; }
     NSString *lower = charString.lowercaseString;
     NSString *upper = charString.uppercaseString;
 
@@ -1151,7 +1158,7 @@ edgeSpacerMultiplier:(CGFloat)edgeSpacerMultiplier {
         NSString *prefix = [itemId substringToIndex:range.location];
         NSString *value = [itemId substringFromIndex:range.location + 1];
         if ([prefix isEqualToString:@"letter"]) {
-            if (value.length == 1) {
+            if (value.length >= 1) {
                 return [self kb_letterKeyWithChar:value];
             }
             return nil;