在滚动视图内使用手势（通过手势将内容带出滚动视图）

Question

在我的 UIScrollView 中我有一个视图。该视图中有几幅图像。我想将图像从滚动条（和视图）拖到主视图。然而，在滚动条和视图前面获取图像让我发疯。

这是我的一段代码：

- (void)viewDidLoad{

    //scroller properties
    scroller.contentSize = CGSizeMake(1300, 130);
    scroller.scrollEnabled = YES;
    scroller.directionalLockEnabled =YES;
    scroller.frame = CGRectMake(0, 874, 768, 130);
    [scroller setDelegate:self];

    UIView *contentContainer = [[UIView alloc] init];

    [scroller addSubview:contentContainer];
    [scroller addSubview:image1];
    [scroller bringSubviewToFront:image1];
    [speler1 release];

    UILongPressGestureRecognizer *longPress1 =
    [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressed:)];
    [image1 addGestureRecognizer:longPress1];
    [longPress1 release];

    UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc]  initWithTarget:self action:@selector(move:)];
    [panRecognizer setMinimumNumberOfTouches:1];
    [panRecognizer setMaximumNumberOfTouches:1];
    [panRecognizer setDelegate:self];
    [image1 addGestureRecognizer:panRecognizer];


}

-(void)longPressed:(UILongPressGestureRecognizer *)sender {

    [[self.view superview] bringSubviewToFront:image1];

}

-(void)move:(id)sender {

    //move the image

}

我想使用 LongPressGestureRecognizer 将图像置于视图前面。 PanGestureRecognizer 负责移动图像。拖动仅在滚动视图内有效。有人知道如何将我的图像带到视图前面吗？

非常感谢帮助

Answer 1

我成功地将图像从滚动条放到主视图中。请参阅下面的我的代码。

- (void)viewDidLoad{

    //scroller properties
    scroller.contentSize = CGSizeMake(1300, 130);
    scroller.scrollEnabled = YES;
    scroller.directionalLockEnabled =YES;
    scroller.frame = CGRectMake(0, 874, 768, 130);
    [scroller setDelegate:self];
    [scroller addSubview:image1];

    [image1 release];

    UILongPressGestureRecognizer *longPress1 =
    [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressed:)];
    [image1 addGestureRecognizer:longPress1];
    [longPress1 release];

    UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc]  initWithTarget:self action:@selector(move:)];
    [panRecognizer setMinimumNumberOfTouches:2];
    [panRecognizer setMaximumNumberOfTouches:2];
    [panRecognizer setDelegate:self];
    [image1 addGestureRecognizer:panRecognizer];


}

-(void)longPressed:(UILongPressGestureRecognizer *)sender {

    CGPoint location = [sender locationInView:self.view];
    [self.view addSubview:image1];
    image1.center = location;
}

-(void)move:(id)sender {

    //move the image
}

现在我希望能够将图像放回滚动视图。我正在尝试通过 Touchsend 和双击来实现这一点。图像将被放置到其原点。但是它不会返回到滚动条内部。这是一个 TouchedEnd 方法的一部分。

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    [super touchesEnded:touches withEvent:event];

    UITouch *touch = [touches anyObject];

    if ([touch tapCount] == 2) {
        [UIView beginAnimations:nil context:NULL];
        [UIView setAnimationBeginsFromCurrentState:YES];
        [UIView setAnimationCurve:UIViewAnimationCurveLinear];
        [UIView setAnimationDuration:0.20];
        [UIView commitAnimations];

        image1.transform = CGAffineTransformIdentity;
        image1.center = CGPointMake(20, 20);

        [self.view sendSubviewToBack:image1];

        return;
    }
}

希望有人能指出正确的方向，以便将图像放回滚动条中原来的位置。

提前致谢！