Define CustomTapGestureRecognizer to reliably toggle local keyboard, better than UITapGestureRecognizer

Limelight/Input/CustomTapGestureRecognizer.m

@@ -0,0 +1,40 @@
+//
+//  CustomTapGestureRecognizer.m
+//  Moonlight
+//
+//  Created by Admin on 2024/5/15.
+//  Copyright © 2024 Moonlight Game Streaming Project. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+#import <UIKit/UIGestureRecognizerSubclass.h>
+#import "CustomTapGestureRecognizer.h"
+
+@implementation CustomTapGestureRecognizer
+
+static NSTimeInterval multiFingerDownTime;
+static bool multiFingerDown;
+
+- (instancetype)initWithTarget:(nullable id)target action:(nullable SEL)action {
+    self = [super initWithTarget:target action:action];
+    return self;
+}
+
+- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
+    // Check if the number of touches and taps meets the required criteria
+    if ([[event allTouches] count] == _numberOfTouchesRequired) {
+        multiFingerDownTime = CACurrentMediaTime();
+        multiFingerDown = true;
+        self.state = UIGestureRecognizerStatePossible;
+    }
+}
+
+- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
+    // [super touchesEnded:touches withEvent:event];
+    if(multiFingerDown && [[event allTouches] count] == [touches count]){
+        multiFingerDown = false;
+        if((CACurrentMediaTime() - multiFingerDownTime) < _tapDownTimeThreshold / 1000) self.state = UIGestureRecognizerStateRecognized;
+    }
+}
+
+@end