Question

我设置了以下UIPanGestureRecognizer：

- (void)pan:(UIPanGestureRecognizer *)gesture {
    if ((gesture.state == UIGestureRecognizerStateChanged) ||
        (gesture.state == UIGestureRecognizerStateEnded)) {
        CGPoint translation = [gesture translationInView:self.superview];
        gesture.view.center = CGPointMake(gesture.view.center.x + translation.x, gesture.view.center.y + translation.y);
        [gesture setTranslation:CGPointZero inView:self.superview];
    }
}

我想在视图中平移，在同一视图中将一个地方移动到另一个地方。这样做是在移动视图，我如何修改它以做我想做的事？

更新：这是我的方法最终正确平移的方式

- (void)pan:(UIPanGestureRecognizer *)gesture {
    if ((gesture.state == UIGestureRecognizerStateChanged) ||
        (gesture.state == UIGestureRecognizerStateEnded)) {
        CGPoint translation = [gesture translationInView:self];;
        self.origin = CGPointMake(self.origin.x + translation.x, self.origin.y + translation.y);
        [gesture setTranslation:CGPointZero inView:self];
    } 
}

origin是我视图中的一个属性，它只标记图形中心的位置。在其setter方法中，只要更改此值，就会有setNeedsDisplay更新

Answer 1

好吧，如果你想在不使用UIScrollView的情况下水平滚动，那么（这只是我的头顶，未经测试），试试这个：

- (void)pan:(UIPanGestureRecognizer *)gesture {
    if ((gesture.state == UIGestureRecognizerStateChanged) ||
        (gesture.state == UIGestureRecognizerStateEnded)) {
        CGPoint translation = [gesture translationInView:self.superview];
        gesture.view.center = CGPointMake(gesture.view.center.x + translation.x, gesture.view.center.y);
        [gesture setTranslation:CGPointZero inView:self.superview];
    }
}

您所做的就是忽略+ translation.y。

如果您想使用UIScrollView（我推荐），请参阅以下教程之一：Are there any good UIScrollView Tutorials on the net?

iOS：在视图中平移

1 个答案: