Question

我的图像似乎在我触摸每个其他更新的位置下方呈现。另一次它按预期进行。

我希望图像从上次移动时的偏移量移动而不会闪烁回到触摸位置。我怎么能这样做？

以下是代码：

int xposStamp;
int yposStamp;

int lastxposStamp;
int lastyposStamp;


- (void) touchesEnded: (NSSet *) touches
            withEvent: (UIEvent *) event
{
    lastxposStamp = xposStamp;
    lastyposStamp = yposStamp;
    NSLog(@"touchesEndedCalled");

}

- (void) touchesMoved: (NSSet *) touches
            withEvent: (UIEvent *) event
{
    if([touches count] == 1){

        CGPoint touchPoint = [[touches anyObject] locationInView:_photoImageView];

        CGRect rect = _draggableImageView.frame;

        int xOffset = touchPoint.x-rect.origin.x;
        int yOffset = touchPoint.y-rect.origin.y;

        rect.origin.x = lastxposStamp+xOffset;
        rect.origin.y = lastyposStamp+yOffset;

        _draggableImageView.frame = rect;

        //xpos and y pos of the stamp

        xposStamp = rect.origin.x;
        yposStamp = rect.origin.y;

        NSLog(@"xpos: %d, ypos: %d", xposStamp, yposStamp);
    }
}

这里还有一个NSLog：

2013-08-19 14:25:52.898 JABImageMerge[2292:907] xpos: -11, ypos: 206
2013-08-19 14:25:52.914 JABImageMerge[2292:907] xpos: 133, ypos: 204
2013-08-19 14:25:52.930 JABImageMerge[2292:907] xpos: -16, ypos: 215
2013-08-19 14:25:52.946 JABImageMerge[2292:907] xpos: 128, ypos: 212
2013-08-19 14:25:52.962 JABImageMerge[2292:907] xpos: -19, ypos: 222
2013-08-19 14:25:52.978 JABImageMerge[2292:907] xpos: 124, ypos: 218
2013-08-19 14:25:52.994 JABImageMerge[2292:907] xpos: -21, ypos: 225
2013-08-19 14:25:53.010 JABImageMerge[2292:907] xpos: 121, ypos: 221
2013-08-19 14:25:53.026 JABImageMerge[2292:907] xpos: -22, ypos: 226
2013-08-19 14:25:53.042 JABImageMerge[2292:907] xpos: 120, ypos: 222
2013-08-19 14:25:53.058 JABImageMerge[2292:907] xpos: -21, ypos: 227
2013-08-19 14:25:53.074 JABImageMerge[2292:907] touchesEndedCalled

设置使用此代码的演示应用程序：

photoImageView是一个imageview。
draggableImageView是一个imageview。
实施了UIGestureRecognizerDelegate

希望有人可以帮我解决这个难题。我不是最数学的程序员。

Answer 1

答案如下：

将此添加到.m文件中。

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    return YES;
}

请勿使用TouchesMoved。而是使用平移手势在视图中移动：

- (void)panDetected:(UIPanGestureRecognizer *)panRecognizer
{

    CGPoint translation = [panRecognizer translationInView:self.view];
    CGPoint imageViewPosition = self.draggableImage.center;
    imageViewPosition.x += translation.x;
    imageViewPosition.y += translation.y;

    self.draggableImage.center = imageViewPosition;
    [panRecognizer setTranslation:CGPointZero inView:self.view];

}

Answer 2

请尝试使用下一代码：

 CGPoint touchPoint = [[touches anyObject] locationInView:_photoImageView.superview];
 _photoImageView.center = touchPoint;

或者搜索拖动视图的实现，有很多例子。

使用touchesMoved拖动图像闪烁

2 个答案: