Question

我正在尝试使用UISegmentedControl切换的两个数据数据，然后数据将显示在UICollectionView中。因此，在故事板中，我有两个段用于段控制以匹配两个阵列。目前，数据未显示，以下switch语句属于默认prinln。

func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {

var number: Int = 0

switch tabs.selectedSegmentIndex {

case 0: number = array1.count

case 1: number = array2.count

default: println("error counting array for number of items in section")

}

return number
}

有没有人有任何想法我可能会出错？这是我第一次尝试使用分段控件。

以下是我的View Controller代码：

@IBOutlet weak var tabs: UISegmentedControl!
@IBOutlet weak var collectionView: UICollectionView!

let moc = (UIApplication.sharedApplication().delegate as! AppDelegate).managedObjectContext

var array1 = [Type1]()
var array2 = [Type2]()

func loadData() {

    var error: NSError?

    let request1 = NSFetchRequest(entityName: "Type1")
    request1.sortDescriptors = [NSSortDescriptor(key: "date", ascending: true)]
    self.array1 = moc?.executeFetchRequest(request1, error: &error) as! [Type1]

    let request2 = NSFetchRequest(entityName: "Type2")
    request2.sortDescriptors = [NSSortDescriptor(key: "date", ascending: true)]
    self.array2 = moc?.executeFetchRequest(request2, error: &error) as! [Type2]

    self.collectionView.reloadData()
}

override func viewWillAppear(animated: Bool) {
    loadData()
}


override func viewDidLoad() {
    super.viewDidLoad()
    loadData()
}

// MARK: UICollectionViewDataSource

func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int {
    //#warning Incomplete method implementation -- Return the number of sections
    return 1
}


func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    //#warning Incomplete method implementation -- Return the number of items in the section

    var number: Int = 0

    switch tabs.selectedSegmentIndex {

    case 0: number = array1.count

    case 1: number = array2.count

    default: println("error counting array for number of items in section")

    }

    return number
}

func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {

    let cell = collectionView.dequeueReusableCellWithReuseIdentifier("Cell", forIndexPath: indexPath) as! CollectionViewCell

    // Configure the cell

    var data1 = array1[indexPath.row]
    var data2 = array2[indexPath.row]

    switch tabs.selectedSegmentIndex {

    case 0:

    cell.titleLabel.text = self.data1[indexPath.row].title

    case 1:

    cell.titleLabel.text = self.data2[indexPath.row].title

    default: println("error with switch statement for cell data")

    }

    return cell
}


func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath)  {

    let cell = collectionView.dequeueReusableCellWithReuseIdentifier("Cell", forIndexPath: indexPath) as! CollectionViewCell


}

Answer 1

在viewDidLoad将selectedSegmentedIndex设置为0（或1），因为默认值为-1。

tabs.selectedSegmentedIndex = 0

默认值为UISegmentedControlNoSegment（未选择任何片段），直到用户触摸片段。将此属性设置为-1可关闭当前选择。

Answer 2

对我来说什么都没有，但是尝试一下。以编程方式添加UISegmentedControl时，只需在viewDidLoad方法中调用此行代码 UISegmentedControl操作名称，然后添加您的segmentedTabar变量名称或IBOutlet名称，如下所示：

segmentedTabarButtonsTap(segmentedTabbar)

segmentedTabarButtonsTap是segmentedTabbar动作， segmentedTabbar是segmentedTabbar变量名称

带有UICollectionView错误的UISegmentedControl与Switch语句

2 个答案: