Question

我正在尝试让多个UIImageViews在拖动时移动。我最初把所有动作都放在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。

如何拖动每个图像拥有自己的术语（我拖动第一个图像，只移动第一个图像等）？

Answer 1

我不确定这是不是你要找的，但是我刚刚做过这个，所以希望它有用。

只需确保在XIB文件中设置7个UIImageViews，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

你应该看看UIPanGestureRecognizer。在负责这些多个图像视图的视图控制器中，为每个图像视图添加平移手势识别器。视图控制器应负责响应平移手势回调并相应地移动图像视图的帧。

值得注意的是，您还应该从中心抓取图像视图中的触摸偏移并存储它。然后，当平移视图时，您需要将偏移量计入计算中。这样，如果视图开始拖动到远离中心点的位置，视图就不会跳到用户的手指上。

请参阅2010年和2011年关于UIScrollView的WWDC会话视频。特别是从2011年开始。他们将举例说明如何做到这一点。

Answer 3

我已经开始工作了！

-(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，它会消失！有没有人解决这个问题？

具有不同触摸的多个移动UIImage视图

3 个答案: