Adding new API for custom drawing.

MASShortcutView.h

@@ -14,4 +14,7 @@ typedef enum {
 @property (nonatomic, copy) void (^shortcutValueChange)(MASShortcutView *sender);
 @property (nonatomic) MASShortcutViewAppearance appearance;
 
+/// Returns custom class for drawing control.
++ (Class)shortcutCellClass;
+
 @end

MASShortcutView.m

@@ -29,14 +29,20 @@
 @synthesize shortcutPlaceholder = _shortcutPlaceholder;
 @synthesize shortcutValueChange = _shortcutValueChange;
 @synthesize recording = _recording;
+@synthesize appearance = _appearance;
 
 #pragma mark -
 
++ (Class)shortcutCellClass
+{
+    return [NSButtonCell class];
+}
+
 - (id)initWithFrame:(CGRect)frameRect
 {
     self = [super initWithFrame:frameRect];
     if (self) {
-        _shortcutCell = [[NSButtonCell alloc] init];
+        _shortcutCell = [[[self.class shortcutCellClass] alloc] init];
         _shortcutCell.buttonType = NSPushOnPushOffButton;
         _shortcutCell.font = [[NSFontManager sharedFontManager] convertFont:_shortcutCell.font toSize:BUTTON_FONT_SIZE];
         _enabled = YES;

README.md

@@ -64,7 +64,7 @@ _observableKeyPath = [@"values." stringByAppendingString:kPreferenceGlobalShortc
 
 # Non-ARC Version
 
-If you like retain/release, please check out these forks: [heardrwt/MASShortcut](https://github.com/heardrwt/MASShortcut) and [chendo/MASShortcut](https://github.com/chendo/MASShortcut).
+If you like retain/release, please check out these forks: [heardrwt/MASShortcut](https://github.com/heardrwt/MASShortcut) and [chendo/MASShortcut](https://github.com/chendo/MASShortcut). However, the preferred way is to enable the `-fobjc-arc` in Xcode source options.
 
 # Copyright