撸了个轮子，集成 GestureRecognizer 到 ReactiveCocoa 里

//添加点击的处理事件 [[self.view rac_signalForGestureRecognizer:[UITapGestureRecognizer class]] subscribeNext:^(UITapGestureRecognizer * x) { NSLog(@"view tapped at %f,%f", [x locationInView:x.view].x,[x locationInView:x.view].y); }]; //添加仅针对 View 中特定区域的拖动检测 [[[self.view rac_signalForGestureRecognizer:[UIPanGestureRecognizer class]] filter:^BOOL(id value) { UIPanGestureRecognizer* pgr = (UIPanGestureRecognizer*)value; CGRect rect = CGRectMake(100, 100, 200, 200); return CGRectContainsPoint(rect, [pgr locationInView:pgr.view]); }] subscribeNext:^(id x) { NSLog(@"panned in given rect"); }]; //缩放事件 [[self.view rac_signalForGestureRecognizer:[UIPinchGestureRecognizer class]] subscribeNext:^(id x) { NSLog(@"view pinched"); }]; //可拖拽 view 的一个非常简单的实现方式 UIView* t = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 100, 100)]; t.backgroundColor = [UIColor yellowColor]; [self.view addSubview:t]; RAC(t,center) = [[t rac_signalForGestureRecognizer:[UIPanGestureRecognizer class]] map:^id(UIPanGestureRecognizer* value) { CGPoint p = [value translationInView:self.view]; [value setTranslation:CGPointZero inView:self.view]; return [NSValue valueWithCGPoint:CGPointMake(t.center.x + p.x, t.center.y + p.y)]; }];