你好，我有UICollectionView滚动时消失了label.text和颜色混合。
我的代码在这里
CustomCollectionViewCell
import UIKit
@IBDesignable
class CustomCollectionViewCell: UICollectionViewCell {
@IBOutlet weak var label: UILabel!
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
setup()
}
override init(frame: CGRect) {
super.init(frame: frame)
setup()
}
func setup() {
self.layer.borderWidth = 1.0
self.layer.borderColor = UIColor.blackColor().CGColor
self.layer.cornerRadius = 5.0
}
}
CustomCollectionViewLayout
import UIKit
public var CELL_HEIGHT = 22.0
public var CELL_WIDTH = 40.0
class CustomCollectionViewLayout: UICollectionViewLayout {
// Used for calculating each cells CGRect on screen.
// CGRect will define the Origin and Size of the cell.
let STATUS_BAR = UIApplication.sharedApplication().statusBarFrame.height
// Dictionary to hold the UICollectionViewLayoutAttributes for
// each cell. The layout attribtues will define the cell's size
// and position (x, y, and z index). I have found this process
// to be one of the heavier parts of the layout. I recommend
// holding onto this data after it has been calculated in either
// a dictionary or data store of some kind for a smooth performance.
var cellAttrsDictionary = Dictionary<NSIndexPath, UICollectionViewLayoutAttributes>()
// Defines the size of the area the user can move around in
// within the collection view.
var contentSize = CGSize.zero
// Used to determine if a data source update has occured.
// Note: The data source would be responsible for updating
// this value if an update was performed.
var dataSourceDidUpdate = true
override func collectionViewContentSize() -> CGSize {
return self.contentSize
}
override func prepareLayout() {
// Only update header cells.
if !dataSourceDidUpdate {
// Determine current content offsets.
let xOffset = collectionView!.contentOffset.x
let yOffset = collectionView!.contentOffset.y
if collectionView?.numberOfSections() > 0 {
for section in 0...collectionView!.numberOfSections()-1 {
// Confirm the section has items.
if collectionView?.numberOfItemsInSection(section) > 0 {
// Update all items in the first row.
if section == 0 {
for item in 0...collectionView!.numberOfItemsInSection(section)-1 {
// Build indexPath to get attributes from dictionary.
let indexPath = NSIndexPath(forItem: item, inSection: section)
// Update y-position to follow user.
if let attrs = cellAttrsDictionary[indexPath] {
var frame = attrs.frame
// Also update x-position for corner cell.
if item == 0 {
frame.origin.x = xOffset
}
frame.origin.y = yOffset
attrs.frame = frame
}
}
// For all other sections, we only need to update
// the x-position for the fist item.
} else {
// Build indexPath to get attributes from dictionary.
let indexPath = NSIndexPath(forItem: 0, inSection: section)
// Update y-position to follow user.
if let attrs = cellAttrsDictionary[indexPath] {
var frame = attrs.frame
frame.origin.x = xOffset
attrs.frame = frame
}
}
}
}
}
// Do not run attribute generation code
// unless data source has been updated.
return
}
// Acknowledge data source change, and disable for next time.
dataSourceDidUpdate = false
var maxItemInASection: Int?
// Cycle through each section of the data source.
if collectionView?.numberOfSections() > 0 {
for section in 0...collectionView!.numberOfSections()-1 {
// Cycle through each item in the section.
if collectionView?.numberOfItemsInSection(section) > 0 {
for item in 0...collectionView!.numberOfItemsInSection(section)-1 {
// Build the UICollectionVieLayoutAttributes for the cell.
let cellIndex = NSIndexPath(forItem: item, inSection: section)
let xPos = Double(item) * CELL_WIDTH
let yPos = Double(section) * CELL_HEIGHT
let cellAttributes = UICollectionViewLayoutAttributes(forCellWithIndexPath: cellIndex)
cellAttributes.frame = CGRect(x: xPos, y: yPos, width: CELL_WIDTH, height: CELL_HEIGHT)
// Determine zIndex based on cell type.
if section == 0 && item == 0 {
cellAttributes.zIndex = 4
} else if section == 0 {
cellAttributes.zIndex = 3
} else if item == 0 {
cellAttributes.zIndex = 2
} else {
cellAttributes.zIndex = 1
}
// Save the attributes.
cellAttrsDictionary[cellIndex] = cellAttributes
if maxItemInASection < item {
maxItemInASection = item
}
}
}
}
}
// Update content size.
let contentWidth = Double(maxItemInASection ?? 0) * CELL_WIDTH
let contentHeight = Double(collectionView!.numberOfSections()) * CELL_HEIGHT
self.contentSize = CGSize(width: contentWidth, height: contentHeight)
}
override func layoutAttributesForElementsInRect(rect: CGRect) -> [UICollectionViewLayoutAttributes]? {
// Create an array to hold all elements found in our current view.
var attributesInRect = [UICollectionViewLayoutAttributes]()
// Check each element to see if it should be returned.
for cellAttributes in cellAttrsDictionary.values.elements {
if CGRectIntersectsRect(rect, cellAttributes.frame) {
attributesInRect.append(cellAttributes)
}
}
// Return list of elements.
return attributesInRect
}
override func layoutAttributesForItemAtIndexPath(indexPath: NSIndexPath) -> UICollectionViewLayoutAttributes? {
return cellAttrsDictionary[indexPath]!
}
override func shouldInvalidateLayoutForBoundsChange(newBounds: CGRect) -> Bool {
return true
}
}
HttpManager
import Foundation
class HttpManager {
class func getRequest(url: String, parameter: Dictionary <String, AnyObject>?, completionHandler: (responseData: [Item]?, errorMessage: String?) -> ()) {
guard let url = NSURL(string: url) else {
completionHandler(responseData: .None, errorMessage: "URL string was malformed")
return
}
let task = NSURLSession.sharedSession().dataTaskWithURL(url) { (data, response, error) in
guard error == nil else {
completionHandler(responseData: .None, errorMessage: error?.localizedDescription)
return
}
guard let data = data else {
completionHandler(responseData: .None, errorMessage: "Empty Data")
return
}
guard let jsonSerialization = try? NSJSONSerialization.JSONObjectWithData(data, options:[]), jsonArray = jsonSerialization as? NSArray else {
completionHandler(responseData: .None, errorMessage: "NSJSONSerialization error")
return
}
var items = [Item]()
jsonArray.forEach({ (eachItem) -> () in
guard let dic = eachItem as? NSDictionary else { return }
guard let service = dic["Seats"] as? String, base = dic["Base"] as? String else {
completionHandler(responseData: .None, errorMessage: "JSON structure missmatch")
return
}
let services = service.componentsSeparatedByString(",")
let item = Item(base: base, services: services)
items.append(item)
})
completionHandler(responseData: items, errorMessage: .None)
}
task.resume()
}
}
CustomCollectionViewController
class CustomCollectionViewController: UIViewController {
@IBOutlet weak var collectionView: UICollectionView!
var items = [Item]()
override func viewDidLoad() {
super.viewDidLoad()
// Uncomment the following line to preserve selection between presentations
// self.clearsSelectionOnViewWillAppear = false
getDataFromServer()
}
func getDataFromServer() {
HttpManager.getRequest(url, parameter: .None) { [weak self] (responseData, errorMessage) -> () in
guard let strongSelf = self else { return }
guard let responseData = responseData else {
print("Get request error \(errorMessage)")
return
}
guard let customCollectionViewLayout = strongSelf.collectionView?.collectionViewLayout as? CustomCollectionViewLayout else { return }
strongSelf.items = responseData
customCollectionViewLayout.dataSourceDidUpdate = true
NSOperationQueue.mainQueue().addOperationWithBlock({ () -> Void in
strongSelf.collectionView!.reloadData()
})
}
}
}
// MARK: UICollectionViewDataSource
extension CustomCollectionViewController {
func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int {
return items.count
}
func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return items[section].services.count + 1
}
选择代码
func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
// You must call super to animate selection
if indexPath.item == 0 {
print(items[indexPath.section].base)
} else {
let clickeditem = items[indexPath.section].services[indexPath.item - 1]
if let myStringc: String = items[indexPath.section].services[indexPath.item - 1] {
var myStringArrc = myStringc.componentsSeparatedByString("*")
let satimdurum:Int = Int(myStringArrc[3])!
let sirano:Int = Int(myStringArrc[0])!
if sirano == 1 || sirano == 2 {
if sirano == 2 {
if satimdurum == 0 {
if koltuksiraid.contains(clickeditem) {
if let index = koltuksiraid.indexOf(clickeditem) {
koltuksiraid.removeAtIndex(index)
}
let selectedCell:UICollectionViewCell = collectionView.cellForItemAtIndexPath(indexPath)!
selectedCell.contentView.backgroundColor = UIColor.orangeColor()
}else{
koltuksiraid.append(clickeditem)
let selectedCell:UICollectionViewCell = collectionView.cellForItemAtIndexPath(indexPath)!
selectedCell.contentView.backgroundColor = UIColor(red: 62/256, green: 211/256, blue: 238/256, alpha: 1)
}
}else{
}
}else{
if satimdurum == 0 {
if koltuksiraid.contains(clickeditem) {
if let index = koltuksiraid.indexOf(clickeditem) {
koltuksiraid.removeAtIndex(index)
}
let selectedCell:UICollectionViewCell = collectionView.cellForItemAtIndexPath(indexPath)!
selectedCell.contentView.backgroundColor = UIColor.greenColor()
}else{
koltuksiraid.append(clickeditem)
let selectedCell:UICollectionViewCell = collectionView.cellForItemAtIndexPath(indexPath)!
selectedCell.contentView.backgroundColor = UIColor(red: 62/256, green: 211/256, blue: 238/256, alpha: 1)
}
}else{
}
}
}
}
}
print(koltuksiraid)
}
最新集合查看@ pkc456回答后的代码。
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCellWithReuseIdentifier(reuseIdentifier, forIndexPath: indexPath) as! CustomCollectionViewCell
cell.label.font.fontWithSize(12)
cell.label.textColor = UIColor.whiteColor()
if indexPath.item == 0 {
cell.label.text = items[indexPath.section].base
cell.label.frame.size.width = 30
cell.label.frame.size.height = 30
cell.label.layer.borderColor = UIColor.clearColor().CGColor
cell.contentView.backgroundColor = UIColor.clearColor()
} else {
if let myStringc: String = items[indexPath.section].services[indexPath.item - 1] {
var myStringArrc = myStringc.componentsSeparatedByString("*")
let satimdurum:Int = Int(myStringArrc[3])!
let sirano:Int = Int(myStringArrc[0])!
if sirano == 1 || sirano == 2 {
cell.label.backgroundColor = (satimdurum == 1) ? UIColor.redColor() : UIColor.orangeColor()
cell.contentView.backgroundColor = (satimdurum == 1) ? UIColor.redColor() : UIColor.greenColor()
cell.label.layer.borderColor = UIColor.blackColor().CGColor
cell.alpha = 1
if sirano == 2 {
cell.frame.size.width = 80
cell.layer.frame.size.width = 80
CELL_WIDTH = 80.0
CELL_HEIGHT = 22.0
if satimdurum == 1 {
cell.label.alpha = 1
cell.label.layer.borderColor = UIColor.redColor().CGColor
cell.contentView.backgroundColor = UIColor.redColor()
cell.label.text = myStringArrc[1]
}else{
if myStringArrc[1] == "NULL" {
cell.label.alpha = 0
cell.label.layer.borderColor = UIColor.clearColor().CGColor
cell.label.frame.size.width = 0
cell.label.frame.size.height = 0
cell.contentView.backgroundColor = UIColor.clearColor()
}else{
cell.label.alpha = 1
cell.label.backgroundColor = UIColor.orangeColor()//Or put orange color as per your logic based on myStringArrc
cell.label.frame.size.width = 40
cell.label.frame.size.height = 40
cell.contentView.backgroundColor = UIColor.orangeColor()//Or put orange color as per your logic based on myStringArrc
cell.label.text = myStringArrc[1]
}
}
cell.label.text = "\(myStringArrc[1])-\(myStringArrc[5])"
}else{
cell.frame.size.width = 40
cell.layer.frame.size.width = 40
CELL_HEIGHT = 22.0
CELL_WIDTH = 40
if satimdurum == 1 {
cell.label.alpha = 1
cell.label.layer.borderColor = UIColor.redColor().CGColor
cell.contentView.backgroundColor = UIColor.redColor()
cell.label.text = myStringArrc[1]
}else{
if myStringArrc[1] == "NULL" {
cell.label.alpha = 0
cell.label.backgroundColor = UIColor.clearColor()
cell.label.layer.borderColor = UIColor.clearColor().CGColor
cell.label.frame.size.width = 0
cell.label.frame.size.height = 0
cell.contentView.backgroundColor = UIColor.clearColor()
}else{
cell.label.text = myStringArrc[1]
cell.label.alpha = 1
cell.label.frame.size.width = 40
cell.label.frame.size.height = 40
cell.contentView.backgroundColor = UIColor.greenColor()//Or put orange color as per your logic based on myStringArrc
}
}
}
}else{
cell.label.alpha = 0
cell.label.layer.borderColor = UIColor.clearColor().CGColor
cell.label.frame.size.width = 0
cell.label.frame.size.height = 0
cell.contentView.backgroundColor = UIColor.clearColor()
cell.alpha = 0
}
}
}
cell.label.backgroundColor = UIColor.clearColor()
return cell
}
}
和最新的问题后，新的collectionview代码。
最佳答案
滚动丢失后是否选择了单元格(蓝色)
您要在clickeditem上的koltuksiraid数组中添加或删除didSelectItemAtIndexPath
koltuksiraid.removeAtIndex(index)
koltuksiraid.append(clickeditem)
滚动单元格时，将重用view并调用
cellForItemAtIndexPath。您应该在此处添加检查以确定单元格的颜色，例如let color = koltuksiraid.contains(myStringc) ? UIColor(red: 62/256, green: 211/256, blue: 238/256, alpha: 1) : UIColor.orangeColor()
单元格标签右下角后滚动
单元格标签应位于单元格的中心位置，而不管单元格的大小如何。这样做就形成了
storyboard。从viewController中删除所有与标签框架相关的代码一些像这样的双倍宽度的单元格
这是一个大问题。单元格位于
cellForItemAtIndexPath之前。您不能在此处更改单元格的帧大小。正确的地方是prepareLayout()的CustomCollectionViewLayout方法。在这里，当您计算每个项目的位置时，您需要检查哪个项目应为两倍。从
cellForItemAtIndexPath中删除所有与单元格相关的代码。创建一个protocolprotocol CustomCollectionViewDelegateLayout: NSObjectProtocol {
func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, widthForItemAtIndexPath indexPath: NSIndexPath) -> CGFloat
}
在您的
viewController中实现了此协议方法。返回值将是给定indexPath的宽度extension CustomCollectionViewController: CustomCollectionViewDelegateLayout {
func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, widthForItemAtIndexPath indexPath: NSIndexPath) -> CGFloat {
//from indexPath.section and indexPath.item identify double width item
if sirano == 2 && satimdurum == 0 {
return regularWidth * 2
}
return regularWidth
}
}
在https://github.com/rishi420/UICollectionviewsample用xcode 7.2制作了一个演示项目
关于ios - 滚动时，Swift UICollectionView消失了label.text和颜色混合在一起可能是BUG？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/38991612/