我有两个数据数组，我试图使用UISegmentedControl在它们之间切换，然后数据将显示在UICollectionView。所以在 Storyboard 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
}
有没有人知道我可能哪里出错了？这是我第一次尝试使用分段控件。
这是我的 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
}
最佳答案
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.
关于ios - UISegmentedControl 与 UICollectionView 错误与 Switch 语句，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/31598282/