检测（使用Tap手势）和拖动线（使用平移手势）

Question

我想拖动由Me完成的绘制线。下面的代码片段在堆栈溢出用户回答的帮助下正常工作。

//我在.h文件中的实例

CGPoint location1,location2;
LineView* l;

- (void)viewDidLoad
{
   [super viewDidLoad];
   l = [[LineView alloc]initWithFrame:self.view.frame];
   [self.view addSubview:l];
   UIPinchGestureRecognizer *linepinch = [[UIPinchGestureRecognizer alloc]    
   initWithTarget:l action:@selector(handleLinePinch:)];
   [l addGestureRecognizer:linepinch];
}


- (void)handleLinePinch:(UIPinchGestureRecognizer *)gesture
{
    NSUInteger num_touches = [gesture numberOfTouches];

    // save locations to some instance variables, like `CGPoint location1, location2;`
    if (num_touches >= 1) {
       location1 = [gesture locationOfTouch:0 inView:l];
    }
    if (num_touches >= 2) {
       location2 = [gesture locationOfTouch:1 inView:l];
    }
    [l drawRect:location1 Loc2:location2];
    [l setNeedsDisplay];

}


LineView.m

- (void)drawRect:(CGPoint)location1 Loc2:(CGPoint)location2 {

CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetLineWidth(context, 5.0);
CGContextMoveToPoint(context, location1.x, location1.y);
CGContextAddLineToPoint(context, location2.x, location2.y);
CGContextStrokePath(context);
}

上面的代码片段工作正常，但我想提前使用UITapGeustureRecognizer或someother.thanks拖动此行。