ios - 试图移动 UIImageView，移动整个屏幕 View

Question

我希望我的 UIViewImages 可以通过触摸移动。我正在尝试使用在我的 ViewController 中实现的代码:

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

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    if ([touches count]==1) {
        UITouch *touch = [touches anyObject];
        CGPoint p0 = [touch previousLocationInView:self.view];
        CGPoint p1 = [touch locationInView:self.view];
        CGPoint center = self.view.center;
        center.x += p1.x - p0.x;
        center.y += p1.y - p0.y;
        self.view.center = center;
    }
}

当我尝试拖动 UIImageView 时，我正在拖动整个屏幕，这是不正确的。需要帮助!

卡罗尔

Answer 1

您创建一个手势识别器并将其添加到 View 中，如下所示:

UIPanGestureRecognizer *panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(gestureRecognizerMethod:)];
[self.imageView addGestureRecognizer:panGestureRecognizer];

你可以调整 ImageView 的位置

- (void)gestureRecognizerMethod:(UIPanGestureRecognizer *)recogniser
{
    if (recognizer.state == UIGestureRecognizerStateBegan || recognizer.state == UIGestureRecognizerStateChanged)
    {
        CGPoint touchLocation = [recognizer locationInView:self.view];
        self.imageView.center = touchLocation;
    }
}

read这篇文章。