Question

在我的应用程序中，使用了库概念。这需要双击并使用2个手指来放大图像。我使用下面的代码，但它不适合我。我能够实现这个功能.. 请解决我的问题。

 - (void)viewDidLoad
    {
       [self setupScrollView];
     }
    -(void) setupScrollView
    {
        //add the scrollview to the view
        image_scroll = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0,
                                                                      self.view.frame.size.width,
self.view.frame.size.height)];
        image_scroll.pagingEnabled = YES;
        [image_scroll setAlwaysBounceVertical:NO];
        //setup internal views
        for (int i = 0; i < [self.PhotoImgArr count]; i++) {
            current_page =(int)self.PhotoImgArr[i];
            CGFloat xOrigin = i * self.view.frame.size.width;
            AsyncImageView *image = [[AsyncImageView alloc] initWithFrame:
                                     CGRectMake(xOrigin, 0,
                                                self.view.frame.size.width,
                                                self.view.frame.size.height)];
            image.imageURL = [NSURL URLWithString:self.PhotoImgArr[i]];
            image.contentMode = UIViewContentModeScaleAspectFit;
            [image_scroll addSubview:image];
        }
        //set the scroll view content size

        [image_scroll setShowsHorizontalScrollIndicator:NO];
        [image_scroll setShowsVerticalScrollIndicator:NO];
        [image_scroll setMaximumZoomScale:8.0];
        self.image_view.autoresizingMask=UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight;
        image_scroll.decelerationRate = UIScrollViewDecelerationRateFast;
        UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleDoubleTap:)];

        [doubleTap setNumberOfTapsRequired:2];

        [image_scroll addGestureRecognizer:doubleTap];
        image_scroll.contentSize = CGSizeMake(self.view.frame.size.width *
                                              self.PhotoImgArr.count,
                                              self.view.frame.size.height);


        //add the scrollview to this view
        [self.view addSubview:image_scroll];
           [image_scroll setZoomScale:[image_scroll minimumZoomScale]];


    }

    - (void)handleDoubleTap:(UIGestureRecognizer *)gestureRecognizer {

        if(image_scroll.zoomScale > image_scroll.minimumZoomScale)
            [image_scroll setZoomScale:image_scroll.minimumZoomScale animated:YES];
        else
            [image_scroll setZoomScale:image_scroll.maximumZoomScale animated:YES];

    }

Answer 1

您应该设置userInteractionEnabled

的image_scroll

image_scroll.userInteractionEnabled = YES;

如何在iOS中双击并用2个手指捏合图像？

1 个答案: