UISegmentedControl 与 UICollectionView 错误与 Switch 语句

Question

我有 两个数组 的数据，我试图使用 UISegmentedControl 在它们之间切换，然后数据将显示在 UICollectionView 中.所以在情节提要中，我有 2 个段用于段控件以匹配两个数组。目前数据未显示，以下 switch 语句为默认 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
}

有人知道我可能哪里出错了吗？这是我第一次尝试使用分段控件。

这是我的视图控制器代码：

@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

在您的 viewDidLoad 中将 selectedSegmentedIndex 设置为 0（或 1），因为默认值为 -1。

tabs.selectedSegmentedIndex = 0

The default value is UISegmentedControlNoSegment (no segment selected) until the user touches a segment. Set this property to -1 to turn off the current selection.

Answer 2

对我来说没什么用，但试试这个。当您以编程方式添加 UISegmentedControl 时，只需在 viewDidLoad 方法中调用这行代码 UISegmentedControl 操作名称然后添加您的 segmentedTabar var 名称或 IBOutlet 名称，如下所示：

segmentedTabarButtonsTap(segmentedTabbar)

segmentedTabarButtonsTap 是 segmentedTabbar 动作和 segmentedTabbar 是 segmentedTabbar var name

UISegmentedControl 与 UICollectionView 错误与 Switch 语句

UISegmentedControl with UICollectionView Error with Switch Statement

ios

swift

switch-statement

uicollectionview

uisegmentedcontrol