iOS：内部带有可点击对象的ScrollView

Question

以下代码行表示我插入到scrollView中的对象。

我的问题是，scrollview中的所有图像都不是可拖放的。

当单独添加图像时（即在滚动视图之外），只需单击即可将其拖放。

似乎发生的每个事件都会触发scrollViews侦听器，而不是单击的图像侦听器。

无论如何添加图像，scrollView均可完美滚动。

如果单击，如何触发图像拖放，并且仍然能够滚动其父视图-scrollView？

#import "BookShelfSection.h"

@implementation BookShelfSection



- (id)initBookShelfWithX:(CGFloat)x y:(CGFloat)y width:(CGFloat)width height:(CGFloat)height
{
    self = [super initWithFrame:CGRectMake(x, y, width, height)];
    self.userInteractionEnabled = YES;
    return self;
}

    - (void)addPages:(NSArray *)fileNameArray
{
    for (id shelf in fileNameArray) {
        UIView *view = [[UIView alloc] initWithFrame: CGRectMake ( 0, 0, self.frame.size.width, self.frame.size.height)];
        UIImage *image = [UIImage imageNamed:[NSString stringWithString:shelf]];
        UIImageView *page = [[UIImageView alloc] initWithImage:image];
        page.frame = CGRectMake(0, 0, self.frame.size.width, self.frame.size.height);
        page.contentMode = UIViewContentModeBottom;

        UIImage *image2 = [UIImage imageNamed:@"car_1.png"];
        Item *item = [[Item alloc] initWithImage:image2 andPosition:CGPointMake(100, 100)];
        page.userInteractionEnabled = YES;
        item.userInteractionEnabled = YES;
        [view addSubview:page];
        [view addSubview:item];

        [self addPageView:view];
    }

}


@end

编辑：这就是我执行拖放的方式：项目类：

#import "Item.h"

@implementation Item

- (id)initWithImage:(UIImage *)image andPosition:(CGPoint)position
{

    CGRect cellRectangle = CGRectMake(position.x, position.y,image.size.width ,image.size.height );

    self = [[Item alloc] initWithFrame:cellRectangle];
    if (self) {
        [self setImage:image];
        [self setUserInteractionEnabled:YES];
    }
    return self;
}

- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    CGPoint pt = [[touches anyObject] locationInView:self];
    startLocation = pt;
    [[self superview] bringSubviewToFront:self];
}
- (void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    CGPoint pt = [[touches anyObject] locationInView:self];
    CGRect frame = [self frame];
    frame.origin.x += pt.x - startLocation.x;
    frame.origin.y += pt.y - startLocation.y;
    [self setFrame:frame];
}

- (void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    CGRect frame = [self frame];
    int originX = (int)roundf(frame.origin.x);
    int originY = (int)roundf(frame.origin.y);
    NSLog(@"Touch ended at point: [%d, %d]", originX, originY);


}

- (void) touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event {
    NSLog(@"Touch cancelled");
}

@end

Answer 1

将其添加到UIImageView：

page.userInteractionEnabled = YES;
item.userInteractionEnabled = YES;

Answer 2

似乎发生的每个事件都会触发scrollViews侦听器，而不是单击的图像侦听器。

当您捕获此事件以进行滚动查看时，请遍历添加的页面/图像并检查userInteractionEnabled的值？ 可能会有助于缩小问题的范围。