Question

我正在尝试使用SwipeView视图，我正在使用paging示例;

- (void)viewDidLoad{
    [super viewDidLoad];

    _swipeView.pagingEnabled = YES;
}

- (NSInteger)numberOfItemsInSwipeView:(SwipeView *)swipeView{
    return [_items count];
}

- (UIView *)swipeView:(SwipeView *)swipeView viewForItemAtIndex:(NSInteger)index reusingView:(UIView *)view{

    //create new view if no view is available for recycling
    if (view == nil)
    {
        //don't do anything specific to the index within
        //this `if (view == nil) {...}` statement because the view will be
        //recycled and used with other index values later
        view = [[UIView alloc] initWithFrame:self.swipeView.bounds];
        view.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;

    }


    //set background color
    CGFloat red = arc4random() / (CGFloat)INT_MAX;
    CGFloat green = arc4random() / (CGFloat)INT_MAX;
    CGFloat blue = arc4random() / (CGFloat)INT_MAX;
    view.backgroundColor = [UIColor colorWithRed:red
                                           green:green
                                            blue:blue
                                           alpha:1.0];

    return view;
}

- (CGSize)swipeViewItemSize:(SwipeView *)swipeView
{
    return self.swipeView.bounds.size;
}

但由于某些原因我有下一个问题：' CALayer位置包含NaN：[nan 227] '。在SwipeView.m中的这行代码：

view.center = CGPointMake(center.x, _scrollView.frame.size.height/2.0f);

- (void)setFrameForView:(UIView *)view atIndex:(NSInteger)index;方法

中的

经过调试并试图找到这个问题的原因后，我看到SwipeView中的属性值scrollOffset从未设置，并且它为零，然后我将viewDidLoad方法中的_scrollOffset设置为1，例如它可以工作，但很少弄乱了scrollOffset。在SwipeView的例子中，一切都运行完美，无需将此属性设置为任何值，任何想法为什么？谢谢！

PROJECT - github

类似的问题： - CALayer position contains NaN: [nan -0.5] - How to solve CALayerInvalidGeometry', reason: 'CALayer position contains NaN: [nan nan]?

编辑：

仅当我使用SwipeView推送视图时才会出现此问题。

Answer 1

您是否正在为_swipeView的数组添加项目，例如？

- (void)awakeFromNib
{
    //set up data
    //your swipeView should always be driven by an array of
    //data of some kind - don't store data in your item views
    //or the recycling mechanism will destroy your data once
    //your item views move off-screen
    self.items = [NSMutableArray array];
    for (int i = 0; i < 100; i++)
    {
        [_items addObject:@(i)];
    }
}

我从未使用过SwipeView但是看起来偏移是根据添加的视图设置的。这可能是你的问题。

修改：我完全重新创建了您的问题，您没有连接数据源并在xib或storyboard中委托出口，控制从SwipeView单击并拖动到ViewController，您的问题应该得到解决！

SwipeView'CALayer位置包含NaN'

1 个答案: