按钮之间无间距，按钮里的图片设置间距

CustomKeyboard/View/KBKeyButton.m

@@ -47,8 +47,8 @@
         [NSLayoutConstraint activateConstraints:@[
             [iv.topAnchor constraintEqualToAnchor:self.topAnchor],
             [iv.bottomAnchor constraintEqualToAnchor:self.bottomAnchor],
-            [iv.leadingAnchor constraintEqualToAnchor:self.leadingAnchor],
-            [iv.trailingAnchor constraintEqualToAnchor:self.trailingAnchor],
+            [iv.leadingAnchor constraintEqualToAnchor:self.leadingAnchor constant:2],
+            [iv.trailingAnchor constraintEqualToAnchor:self.trailingAnchor constant:-2],
         ]];
         self.iconView = iv;
 

CustomKeyboard/View/KBKeyboardView.m

@@ -277,7 +277,7 @@
 
 - (void)buildRow:(UIView *)row withKeys:(NSArray<KBKey *> *)keys edgeSpacerMultiplier:(CGFloat)edgeSpacerMultiplier {
     CGFloat hInset = 6;   // 行左右内边距
-    CGFloat spacing = 6;  // 键与键之间的间距
+    CGFloat spacing = 0;  // 键与键之间的间距
     UIView *previous = nil;
     UIView *leftSpacer = nil;
     UIView *rightSpacer = nil;