拥有多个具有不同触摸的移动 UIImage 视图

Question

我正在努力尝试让多个 UIImageView 在拖动时移动。我最初将所有运动都放在 TouchesBegan 下。但是，当我拖动单个对象时，它们都会消失，只有我拖动的对象会移动。

如何让每个图像都拖动自己的术语（我拖动第一个图像，只有第一个图像移动等）？

Answer 1

我不确定这是否是您正在寻找的内容，但我不久前就从事过此工作，所以希望它有用。

只需确保在 XIB 文件中设置了 7 个 UIImageView，链接它们就可以了。

@synthesize img1, img2, img3, img4, img5, img6, magnet;

-(void) checkInsertion {
    if (CGRectContainsRect(img2.frame, img1.frame)) {img1.center = img2.center;}
    if (CGRectContainsRect(img4.frame, img3.frame)) {img3.center = img4.center;}
    if (CGRectContainsRect(img6.frame, img5.frame)) {img5.center = img6.center;}

    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:0.2];
    if (CGRectIntersectsRect(magnet.frame, img1.frame)) {img1.center = magnet.center;}
    if (CGRectIntersectsRect(magnet.frame, img2.frame)) {img2.center = magnet.center;}
    if (CGRectIntersectsRect(magnet.frame, img3.frame)) {img3.center = magnet.center;}
    if (CGRectIntersectsRect(magnet.frame, img4.frame)) {img4.center = magnet.center;}
    if (CGRectIntersectsRect(magnet.frame, img5.frame)) {img5.center = magnet.center;}
    if (CGRectIntersectsRect(magnet.frame, img6.frame)) {img6.center = magnet.center;}
    [UIView commitAnimations];

}

-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch * touch = [[event allTouches] anyObject];
    CGPoint touchLoc = [touch locationInView:touch.view];

    if (CGRectContainsPoint(img1.frame, touchLoc)) {img1.center = touchLoc;}
    if (CGRectContainsPoint(img3.frame, touchLoc)) {img3.center = touchLoc;}
    if (CGRectContainsPoint(img5.frame, touchLoc)) {img5.center = touchLoc;}

    if (CGRectContainsPoint(magnet.frame, touchLoc)) {magnet.center = touchLoc;}

    [self checkInsertion];
}

-(void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    [self touchesBegan:touches withEvent:event];
}

Answer 2

您应该查看UIPanGestureRecognizer。在负责这些多个图像视图的视图控制器中，向每个图像视图添加平移手势识别器。视图控制器应该负责响应平移手势回调并相应地移动图像视图的框架。

值得注意的是，您还应该获取图像视图中触摸相对于中心的偏移量并将其存储。然后，当平移视图时，您需要将偏移量考虑到计算中。这样，如果用户开始拖动远离中心点的某个位置，视图不会跳到用户的手指上。

请参阅 2010 年和 2011 年有关 UIScrollView 的 WWDC 会议视频。特别是从 2011 年开始。他们举例说明了如何做到这一点。

Answer 3

我已经让它工作了！

-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {

    UITouch *touch = [[event touchesForView:self.view] anyObject];
    CGPoint location = [touch locationInView:touch.view];

    if(CGRectContainsPoint(plusone.frame, location))
    {
        UITouch *touch = [[event allTouches] anyObject];
        CGPoint location = [touch locationInView:touch.view];
        plusone.center = location;
    }
    if(CGRectContainsPoint(plustwo.frame, location))
    {
        UITouch *touch = [[event allTouches] anyObject];
        CGPoint location = [touch locationInView:touch.view];
        plustwo.center = location;
    }
    if(CGRectContainsPoint(plusthree.frame, location))
    {
        UITouch *touch = [[event allTouches] anyObject];
        CGPoint location = [touch locationInView:touch.view];
        plusthree.center = location;
    }
    if(CGRectContainsPoint(minusone.frame, location))
    {
        UITouch *touch = [[event allTouches] anyObject];
        CGPoint location = [touch locationInView:touch.view];
        minusone.center = location;
    }
    if(CGRectContainsPoint(minustwo.frame, location))
    {
        UITouch *touch = [[event allTouches] anyObject];
        CGPoint location = [touch locationInView:touch.view];
        minustwo.center = location;
    }
    if(CGRectContainsPoint(minusthree.frame, location))
    {
        UITouch *touch = [[event allTouches] anyObject];
        CGPoint location = [touch locationInView:touch.view];
        minusthree.center = location;
    }

但是，当一个图像与另一个图像碰撞时，它就消失了！
有人能解决这个问题吗？