UIKeyCommand

keyCommand.m

//用法
xxxxxxButton.mgj_keyCommand = @"2";
-> ctrl + 2 //UIKeyModifierControl

// UIButton+UIKeyCommand
static char *kKeyCommandAssociatedObjectKey;
@interface UIButton (UIKeyCommand)
@property (nonatomic, strong) NSString *mgj_keyCommand;
@end
@implementation UIButton (UIKeyCommand)
- (void)setMgj_keyCommand:(NSString *)mgj_keyCommand
{
    [self bk_associateCopyOfValue:mgj_keyCommand withKey:kKeyCommandAssociatedObjectKey];
}
- (NSString *)mgj_keyCommand
{
    return [self bk_associatedValueForKey:kKeyCommandAssociatedObjectKey];
}
@end


// in vc
- (BOOL)canBecomeFirstResponder {
    return YES;
}

#pragma mark - 快捷键
- (NSArray<UIKeyCommand *>*)keyCommands {

    NSMutableArray *keyCommands = [@[] mutableCopy];
    // workaround: http://stackoverflow.com/questions/28674907/uikeycommand-with-modifier-wont-be-recognized-on-first-invocation
    [keyCommands addObject:[UIKeyCommand keyCommandWithInput:@"" modifierFlags:UIKeyModifierControl action:@selector(keyCommand:) discoverabilityTitle:@"Types"]];

    for (UIView *v in self.view.subviews) {
        if ([v isKindOfClass:[UIButton class]]) {
            UIButton *b = (UIButton *)v;
            if (b.mgj_keyCommand.length) {
                [keyCommands addObject:[UIKeyCommand keyCommandWithInput:b.mgj_keyCommand modifierFlags:UIKeyModifierControl action:@selector(keyCommand:) discoverabilityTitle:[b titleForState:UIControlStateNormal]]];
            }
        }
    }

    return keyCommands;
}
- (void)keyCommand:(UIKeyCommand *)sender {
    NSString *input = sender.input;
    if (!input.length) return;

    for (UIView *v in self.view.subviews) {
        if ([v isKindOfClass:[UIButton class]]) {
            UIButton *b = (UIButton *)v;
            if ([b.mgj_keyCommand isEqualToString:input]) {
                [b sendActionsForControlEvents:UIControlEventTouchUpInside];
            }
        }
    }
}