Question

我在UIView中有一个UIImageView。在UIImageView内部，我在运行时添加了一个UIView（一个引脚），因此你可以多次添加相同的UIView并重新定位它。

问题是当UIImageView放大时UIView的重新定位。一旦UIImageView / UIScrollView放大，我无法抓住UIView（引脚）。整个UIImageView / UIScrollView移动但我可以＆＃39 ;抓住别针。当UIImageView缩小时，我仍然可以移动UIImageView，但我可以轻松选择并移动UIView。

关于如何在我放大时选择UIView而不是UIImageView的任何想法？这是我的代码：

- (void)viewDidLoad
{
    [super viewDidLoad];

    imageView_image.image = originalImage;
    scrollView.contentSize = self.view.frame.size;//originalImage.size;
    scrollView.delegate = self;
    scrollView.minimumZoomScale = 1.0;
    scrollView.maximumZoomScale = 100.0;
}

- (IBAction)button_addAnnotation:(id)sender
{
    annotationImage = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"push-pin-mini@3x.png"]];
    [annotationImage setCenter:CGPointMake(imageView_image.bounds.size.width / 2, imageView_image.bounds.size.height / 2)];

    annotationImage.userInteractionEnabled = YES;
    imageView_image.userInteractionEnabled = YES;

    panRecognizer = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(handlePan:)];
    [annotationImage addGestureRecognizer:panRecognizer];
    [imageView_image addSubview:annotationImage];
}


- (void)handlePan:(UIPanGestureRecognizer *)recognizer
{
    CGPoint translation = [recognizer translationInView:self.view];
    recognizer.view.center = CGPointMake(recognizer.view.center.x + translation.x,
                                         recognizer.view.center.y + translation.y);

    [recognizer setTranslation:CGPointMake(0, 0) inView:self.view];

    if (recognizer.state == UIGestureRecognizerStateEnded)
    {

        CGPoint velocity = [recognizer velocityInView:self.view];
        CGFloat magnitude = sqrtf((velocity.x * velocity.x) + (velocity.y * velocity.y));
        CGFloat slideMult = magnitude / 200;
        //NSLog(@"magnitude: %f, slideMult: %f", magnitude, slideMult);

        float slideFactor = 0.1 * slideMult; // Increase for more of a slide
        CGPoint finalPoint = CGPointMake(recognizer.view.center.x + (velocity.x * slideFactor),
                                         recognizer.view.center.y + (velocity.y * slideFactor));
        finalPoint.x = MIN(MAX(finalPoint.x, 0), self.view.bounds.size.width);
        finalPoint.y = MIN(MAX(finalPoint.y, 0), self.view.bounds.size.height);

        [UIView animateWithDuration:slideFactor*2 delay:0 options:UIViewAnimationOptionCurveEaseOut animations:^{
            recognizer.view.center = finalPoint;
        } completion:nil];
    }
}

感谢。

Answer 1

如果您希望在尝试移动图钉时不滚动滚动视图，可以使用gestureRecognizer:shouldBeRequiredToFailByGestureRecognizer:委托方法使滚动视图手势失败，例如：

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer
        shouldBeRequiredToFailByGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {

    // Make the scroll view pan fail if the pin's "panRecognizer"
    // is recognized
    if (gestureRecognizer == scrollView.panGestureRecognizer && 
        otherGestureRecognizer == panRecognizer) {
        return YES;
    }
    return NO;
}

放大scrollView时无法选择UIView

1 个答案: