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我在 .xib 文件中有一个 UIImageView,当用户选择一个集合视图单元格时,它的大小需要更改。.xib 文件被加载到视图控制器中,并有一个连接两者的 IBOutlet。当前的方法我在 UIView 上运行良好,但在 UIImageView 上失败了。

该代码仅在第一次加载屏幕时失败。如果用户选择任何 Collection View 单元格,UIImageView 更新就好了。

func displayDataForCell(index: Int) {
// Set the box fill amount for Anode, Feeder, and Wave
    let anodePercentAmount = Double(pot.anode!)/100
    let feederPercentAmount = Double(pot.feeder!)/100
    let wavePercentAmount = Double(pot.wave!)/100
    dataView.anodeBoxFill.frame = CGRect(x: 0.0, y: 180.0, width: 120.0, height: 0.0)
    dataView.waveBoxFill.frame = CGRect(x: 0.0, y: 180.0, width: 120.0, height: 0.0)
    dataView.feederBoxFill.frame = CGRect(x: 0.0, y: 180.0, width: 120.0, height: 0.0)

    UIView.animateWithDuration(0.5, animations: { () -> Void in
        self.dataView.anodeBoxFill.frame = CGRect(x: 0.0, y: (180.0 - (180.0*anodePercentAmount)), width: 120.0, height: (180.0*anodePercentAmount))
        self.dataView.feederBoxFill.frame = CGRect(x: 0.0, y: (180.0 - (180.0*feederPercentAmount)), width: 120.0, height: (180.0*feederPercentAmount))
        self.dataView.waveBoxFill.frame = CGRect(x: 0.0, y: (180.0 - (180.0*wavePercentAmount)), width: 120.0, height: (180.0*wavePercentAmount))
    })
}

我在函数collectionView(_, didSelectItemAtIndexPath indexPath:_)方法中调用上述方法如下:

func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
    // This makes sure only one cell can be selected at once
    if currentPotIndex != indexPath.row {
        let cell = collectionView.cellForItemAtIndexPath(indexPath)
        cell?.highlighted

        let cell0 = collectionView.cellForItemAtIndexPath(NSIndexPath(forItem: currentPotIndex, inSection: 0))
        cell0?.highlighted = false
    }

    self.currentPotIndex = indexPath.row

    displayDataForCell(currentPotIndex)

    bottomCollection.reloadData()

}

最后,这是我目前尝试的解决方案:在函数中包含didSelectItemAtIndexPath函数调用viewDidLoad()

//Initialize the view with the 0th indexed pot's data
    collectionView(collectionView, didSelectItemAtIndexPath: NSIndexPath(forItem: currentPotIndex, inSection: 0))
    self.dataView.layoutIfNeeded()

我会附上一张图片,但我没有足够的代表。感谢您的关注!

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1 回答 1

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这是我为解决这个问题所做的:

覆盖该函数viewDidAppear(animated: Bool) 并将动画 UIImageViews 的行为放入此函数中。我想这很有效,因为在处理它们在超级视图中的大小和位置的函数之后加载了不受约束的图像。

于 2015-09-21T15:29:26.840 回答