iOS:在视图中平移

Question

我有以下UIPanGestureRecognizer设置:

- (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,我如何修改它来做我想要的？

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,setNeedsDisplay只要更改此值,就会更新

Answer 1

好的,所以(这只是我的头顶,未经测试)如果你想在不使用UIScrollView的情况下水平滚动,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];
    }
}

你要做的只是遗漏+ translation.y.

如果你想使用UIScrollView(我推荐),请参阅以下教程之一:网上有没有好的UIScrollView教程？