我正在尝试在收集单元格的子视图中添加UILabel。 但是当我滚动到另一个单元格并返回时，所有UIlabels都出现在两个单元格上，而另一些则写在另一个单元格下面。
我尝试使用collectionView.cellForItemAtIndexPath(indexPath) as? CollectionViewCell，但是当我使用它时没有显示UIlabel （我尝试使用断点，它不会在if语句之后）
我该如何解决？
感谢!!!
class CollectionView: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate {
var collection = [PFObject]()
@IBOutlet weak var collectionView: UICollectionView!
let sidePadding:CGFloat = 10
var checkLocation: Bool = false
override func viewDidLoad()
{
super.viewDidLoad();
self.collectionView!.delegate = self
self.collectionView!.dataSource = self
}
func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return self.collection.count
}
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCellWithReuseIdentifier("CollectionCell", forIndexPath: indexPath) as! CollectionViewCell
cell.layer.borderColor = UIColor.lightGrayColor().CGColor
cell.layer.borderWidth = 0.5
cell.layer.cornerRadius = 3
let collectionViewWidth = self.collectionView.bounds.size.width - self.sidePadding * 2
cell.frame.size.width = collectionViewWidth
let collectionViewHeight = self.collectionView.bounds.size.height/4.5
cell.frame.size.height = collectionViewHeight
// Display the country name
if let value = self.collection[indexPath.row]["Name"] as? String {
cell.cellTitle.text = String(Int(indexPath.row)) + "." + value
}
let width = (cell.bounds.width - 94 - 4*3 - 60 - 20)/4
let cellheight = CGFloat(6)
let cellheight1 = CGFloat(6 + 12 + 2)
var array = [String]()
if let MWl = collection[indexPath.row]["MW"] as? Int
{
if MWl == 1 {
array.append("M")
} else if MWl == 2 {
array.append("M")
array.append("W")
}
}
if let JAl = collection[indexPath.row]["JA"] as? Int
{
if JAl == 1 {
array.append("Jy")
} else if JAl == 2 {
array.append("Jy")
array.append("Ac")
}
}
if let HK = collection[indexPath.row]["HK"] as? Int
{
if HK == 1 {
array.append("HB")
} else if HK == 2 {
array.append("HB")
array.append("Ks")
}
}
if let SSl = collection[indexPath.row]["SSl"] as? Int
{
if SSl == 1 {
array.append("AB")
} else if SSl == 2 {
array.append("AB")
array.append("CD")
}
//I tried here too
// if let myCell = collectionView.cellForItemAtIndexPath(indexPath) as? CollectionViewCell
if array.count <= 4 {
for i in 0..<array.count {
let taille = CGFloat(i)
var si = CGFloat((1+i)*3 + 94 + 30)
let label = UILabel() as UILabel
label.frame = CGRectMake((si + width*taille), cellheight, width, 12)
label.textColor = UIColor(red: 0/255, green: 125/255, blue: 255/255, alpha: 1.0)
label.backgroundColor = UIColor.clearColor()
label.layer.borderWidth = 0.7
label.layer.borderColor = UIColor.lightGrayColor().CGColor
label.font = UIFont(name: "Futura-Medium", size: 9)
label.textAlignment = NSTextAlignment.Center
label.numberOfLines = 1
label.text = array[i]
label.layer.masksToBounds = true
label.layer.cornerRadius = 3.5
if let myCell = collectionView.cellForItemAtIndexPath(indexPath) as? CollectionViewCell {
myCell.contentView.addSubview(label)
}
}
} else {
for i in 0...3 {
let taille = CGFloat(i)
var si = CGFloat((1+i)*3 + 94 + 30)
let label = UILabel() as UILabel
label.frame = CGRectMake((si + width*taille), cellheight, width, 12)
label.textColor = UIColor(red: 0/255, green: 125/255, blue: 255/255, alpha: 1.0)
label.backgroundColor = UIColor.clearColor()
label.layer.borderWidth = 0.7
label.layer.borderColor = UIColor.lightGrayColor().CGColor
label.font = UIFont(name: "Futura-Medium", size: 9)
label.textAlignment = NSTextAlignment.Center
label.numberOfLines = 1
label.text = array[i]
label.layer.masksToBounds = true
label.layer.cornerRadius = 3.5
if let myCell = collectionView.cellForItemAtIndexPath(indexPath) as? CollectionViewCell {
myCell.contentView.addSubview(label)
}
}
var j = 0 as Int
for i in 4..<array.count {
let taille = CGFloat(j)
let si = CGFloat((1+j)*3 + 94 + 30)
let label = UILabel() as UILabel
label.frame = CGRectMake((si + width*taille), cellheight1, width, 12)
label.textColor = UIColor(red: 0/255, green: 125/255, blue: 255/255, alpha: 1.0)
label.backgroundColor = UIColor.clearColor()
label.layer.borderWidth = 0.7
label.layer.borderColor = UIColor.lightGrayColor().CGColor
label.font = UIFont(name: "Futura-Medium", size: 9)
label.textAlignment = NSTextAlignment.Center
label.numberOfLines = 1
label.text = array[i]
label.layer.masksToBounds = true
label.layer.cornerRadius = 3.5
if let myCell = collectionView.cellForItemAtIndexPath(indexPath) as? CollectionViewCell {
myCell.contentView.addSubview(label)
}
j = j + 1
}
}
return cell
}
}
修改
我尝试以编程方式创建UILabel。但是通过这种方式，我使用了StoryBoard设计的元素和以编程方式创建的元素。实际上我不能因为这个：
collectionView!.registerClass(RDCell.self, forCellWithReuseIdentifier: "Cell")
我以编程方式创建单元格的所有内容（使用故事板创建collectionView）并且它完美地运行。
答案 0 :(得分：0)
正在重复使用单元格，因此每次调用cellForItemAtIndexPath时都会添加新标签。只需标记label.tag = 1之类的标签，当您将单元格出列时，请使用此标记删除每个子视图，例如
let cell = collectionView.dequeueReusableCellWithReuseIdentifier("CollectionCell", forIndexPath: indexPath) as! CollectionViewCell
for view in cell.subviews {
if view.tag == 1 {
view.removeFromSuperview()
}
}
你总是会重新创建标签，这是糟糕的设计。我建议在故事板上设计这些标签，或者如果你坚持在代码中这样做，请保留对单元格中标签的可选引用，以便每次调用cellForItemAtIndexPath时都不重新创建它们。
答案 1 :(得分：0)
不推荐，但你可以这样做， 将标签添加到每个标签（如1000或其他），如果任何子视图标签与标签标签匹配，则删除该视图
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell
{
let cell = collectionView.dequeueReusableCellWithReuseIdentifier("CollectionCell", forIndexPath: indexPath) as! CollectionViewCell
for let labelIs in cell.subviews
{
if labelIs.tag == 1000
{
labelIs.removeFromSuperview()
}
}
//some whare
var label = UILabel()
label.tag = 1000
return cell
}