UIScrollView 中子视图的 touchEvent

Question

全部，

我有一个问题，我在 StackOverflow（和其他互联网）上查看了所有可能的答案，但我尝试了所有解决方案，但没有任何效果......

我有一个 UIScrollView 和一个 UIImageView 作为子视图来创建一个板。我可以放大和缩小，工作正常。滚动效果也很好！

现在，我想将其他 UIImageView（图块）拖放到 ScrollView 以及 ScrollView 的 OUT 中。但是当我将 UIImageView 放到 ScrollView 中时，我无法拖放子视图。

我在 viewDidLoad 中设置了 UIScrollView 的 setCanCancelContentTouches:NO。
我创建了一个子类 TileImageView 并在初始化中将 ExclusiveTouch 设置为 YES。
NB:boardImage 是一个“普通”UIImageView'，图块与子类一起使用！

补充：当我将 boardImage 的 UserInteraction 设置为 NO 时，ScrollView 会缩放，但 touchBegan 不会被记录。如果我将其设置为 YES，则 ScrollView 不会缩放，但会记录 touchBegan..

所以我留下它以便我可以缩放，但是一旦它们在 ScrollView 中，Tiles 就不能再拖动了。
我究竟做错了什么？或者我错过了什么？

PS：设置 delaysContentTouches 属性会使滚动无效，所以这也不是解决方案...

代码： RootViewController_iphone.m

@implementation RootViewController_iphone

@synthesize boardScrollView;
@synthesize dragObject;
@synthesize boardImage;

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.

    UIImage *image = [UIImage imageNamed:@"greyblue_numbered_15x15_900x900.png"];
    self.boardImage = [[UIImageView alloc] initWithImage:image];
    self.boardImage.frame = (CGRect){.origin=CGPointMake(0.0f, 0.0f), .size=image.size};
    [self.boardScrollView addSubview:self.boardImage];

    self.boardImage.userInteractionEnabled = YES;

    self.boardScrollView.contentSize = image.size;
    self.boardScrollView.userInteractionEnabled = YES;
    self.boardScrollView.canCancelContentTouches = NO;
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
if ([touches count] == 1) {
    // one finger

    CGPoint touchPoint = [[touches anyObject] locationInView:self.view];

    for (UIImageView *iView in self.view.subviews) {
        if ([iView isMemberOfClass:[TileImageView class]]) {
            if (touchPoint.x > iView.frame.origin.x &&
                touchPoint.x < iView.frame.origin.x + iView.frame.size.width &&
                touchPoint.y > iView.frame.origin.y &&
                touchPoint.y < iView.frame.origin.y + iView.frame.size.height)
            {
                self.dragObject = iView;
                self.touchOffset = CGPointMake(touchPoint.x - iView.frame.origin.x,
                                               touchPoint.y - iView.frame.origin.y);
                self.homePosition = CGPointMake(iView.frame.origin.x,
                                                iView.frame.origin.y);
                [self.view bringSubviewToFront:self.dragObject];
            }
        }
    }
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    CGPoint touchPoint = [[touches anyObject] locationInView:self.view];

    CGRect newDragObjectFrame = CGRectMake(touchPoint.x - touchOffset.x,
                                           touchPoint.y - touchOffset.y,
                                           self.dragObject.frame.size.width,
                                           self.dragObject.frame.size.height);
    self.dragObject.frame = newDragObjectFrame;
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [[event allTouches] anyObject];
    NSString *tmp = touch.view.description;

    CGPoint touchPointScreen = [[touches anyObject] locationInView:self.view];
    CGPoint touchPointImage = [[touches anyObject] locationInView:self.boardImage];
    CGPoint touchPointBoard = [[touches anyObject] locationInView:self.boardScrollView];

    if (touchPointScreen.x > self.boardScrollView.frame.origin.x &&
        touchPointScreen.x < self.boardScrollView.frame.origin.x + self.boardScrollView.frame.size.width &&
        touchPointScreen.y > self.boardScrollView.frame.origin.y &&
        touchPointScreen.y < self.boardScrollView.frame.origin.y + self.boardScrollView.frame.size.height)
        {
        self.dragObject.frame = CGRectMake(touchPointImage.x - touchOffset.x,
                                           touchPointImage.y - touchOffset.y,
                                           self.dragObject.frame.size.width,
                                           self.dragObject.frame.size.height);

         [self.boardImage addSubview:self.dragObject]; // add to image


        }
}

代码： TileImageView.m

@implementation TileImageView:

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
        self.exclusiveTouch = YES;
    }
    return self;
}

Answer 1

您已经有了 UIImageView 的子类，因此您可以在子类中执行以下操作：
1- 覆盖 touchsBegan、didEnd 和 didMove
2-在这些方法中将它们传递给UIScrollView的超级视图：[self.superview touchsBegan .... ]
3-如果您的 UIImageView 没有收到这些消息，那么在 init 中添加 self.userInteractionEnabled = YES; 希望对您有所帮助