如何在单元格末尾添加CollectionView自定义单元格？

我有一组图像，显示在集合视图中，我创建了一个单元格，当我点击最后一个打开图像选择器的单元格时。 - >可以在此单元格中设置所选图像，并自动为此添加新单元格。（我不知道这样的想法，请帮忙，谢谢）如何在单元格末尾添加CollectionView自定义单元格？

的CollectionView类

class ViewController: UIViewController,UICollectionViewDelegate,UICollectionViewDataSource,UIImagePickerControllerDelegate,UINavigationControllerDelegate 
{ 

var imagePicker = UIImagePickerController() 
let reuseIdentifier = "cell" // also enter this string as the cell identifier in the storyboard 
var items = ["1", "2", "3", "4", "5"] 

@IBOutlet var collectionView: UICollectionView! 

override func viewDidLoad() { 
    super.viewDidLoad() 
    // Do any additional setup after loading the view, typically from a nib. 
} 

override func didReceiveMemoryWarning() { 
    super.didReceiveMemoryWarning() 
    // Dispose of any resources that can be recreated. 
} 

// MARK: - UICollectionViewDataSource protocol 

func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int { 
    return self.items.count 
} 

func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell { 
    let cell = collectionView.dequeueReusableCellWithReuseIdentifier("cell", forIndexPath: indexPath) as! MyCollectionViewCell 

    // cell.backgroundColor = UIColor.cyanColor() 
    cell.btnSelectImage.setTitle(items[indexPath.row], forState: .Normal) 
    cell.btnSelectImage.tag = indexPath.row 
    cell.btnSelectImage.addTarget(self,action:#selector(buttonClicked), 
        forControlEvents:.TouchUpInside) 
    return cell 

} 

func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) 
{ 
    if indexPath.row == 0 
    { 
     // call your alert here 
    } 
} 
func buttonClicked(sender:UIButton) 
{ 
    let alertController: UIAlertController = UIAlertController(title: "Please choose a Picture".localized, message: nil, preferredStyle: UIAlertControllerStyle.ActionSheet) 
    let cameraAction = UIAlertAction(title: "Camera".localized, style: UIAlertActionStyle.Default){ 
     UIAlertAction in 
     self.openCamera() 
    } 
    let gallaryAction = UIAlertAction(title: "Gallery".localized, style: UIAlertActionStyle.Default){ 
     UIAlertAction in 
     self.openGallary() 
    } 
    let cancelAction = UIAlertAction(title: "Cancel".localized, style: UIAlertActionStyle.Cancel){ 
     UIAlertAction in 
    } 
    alertController.addAction(cameraAction) 
    alertController.addAction(gallaryAction) 
    alertController.addAction(cancelAction) 

    if UIDevice.currentDevice().userInterfaceIdiom == .Phone{ 
     self.presentViewController(alertController, animated: true, completion: nil) 
    } 
} 
//MARK: - UIImagepickercontroller Method - 

func openCamera() 
{ 
    if UIImagePickerController.availableCaptureModesForCameraDevice(.Rear) != nil 
    { 
     imagePicker.allowsEditing = true 
     imagePicker.sourceType = UIImagePickerControllerSourceType.Camera 
     imagePicker.showsCameraControls = true 
     imagePicker.cameraCaptureMode = .Photo 
     imagePicker.takePicture() 

     if UIDevice.currentDevice().userInterfaceIdiom == .Phone 
     { 
      self.presentViewController(imagePicker, animated: true, completion: nil) 
     } 
    } 
    else 
    { 
     noCamera() 
    } 
} 

func openGallary() 
{ 
    if UIDevice.currentDevice().userInterfaceIdiom == .Phone 
    { 
     imagePicker.sourceType = UIImagePickerControllerSourceType.PhotoLibrary 
     self.presentViewController(imagePicker, animated: true, completion: nil) 
     imagePicker.allowsEditing = true 
    } 
    else 
    { 
     imagePicker.sourceType = UIImagePickerControllerSourceType.PhotoLibrary 

    } 
} 
func noCamera() 
{ 
    let alertVC = UIAlertController(title: "ok", message: "Device has no camera".localized, preferredStyle: UIAlertControllerStyle.Alert) 
    let okAction = UIAlertAction(title: "OK".localized, style: UIAlertActionStyle.Default, handler: nil) 
    alertVC.addAction(okAction) 
    presentViewController(alertVC, animated: true, completion: nil) 
} 

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) 
{ 

    let timestamp = Int(NSDate().timeIntervalSince1970) 
    let choosenImage = info[UIImagePickerControllerEditedImage] as! UIImage 


    var indexPath = NSIndexPath(forRow: 0, inSection: 0) 
    let cell = collectionView.cellForItemAtIndexPath(indexPath) as! MyCollectionViewCell 

    cell.btnSelectImage.setBackgroundImage(choosenImage, forState: .Normal) 


    collectionView.reloadData() 

    dismissViewControllerAnimated(true, completion: nil) 

} 
func imagePickerControllerDidCancel(picker: UIImagePickerController) 
{ 
    dismissViewControllerAnimated(true, completion: nil) 
} 

}

CollcetionViewCell

class MyCollectionViewCell: UICollectionViewCell 
{ 

@IBOutlet var btnSelectImage: UIButton! 

}

的图像 - 创建阵列，在的CollectionView

显示

来源

2016-12-27 Mitesh jadav

你能解决问题到现在？ –

@SunilPrajapati是的，但需要这样的电池代码 –

请编辑方法ONLY，并添加一些方法：

var imagePicker = UIImagePickerController() 
var selectedImage : UIImage? 

override func viewDidLoad() { 
    super.viewDidLoad() 
    imagePicker.delegate = self 
    // Do any additional setup after loading the view, typically from a nib. 
} 

func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell { 
    let cell = collectionView.dequeueReusableCellWithReuseIdentifier("cell", forIndexPath: indexPath) as! MyCollectionViewCell 

    cell.btnSelectImage.setTitle(items[indexPath.row], forState: .Normal) 
    cell.btnSelectImage.addTarget(self,action:#selector(buttonClicked), 
       forControlEvents:.TouchUpInside) 

    cell.btnSelectImage.setBackgroundImage(selectedImage, forState: .Normal)//setBackground image of button 
    return cell 
} 


func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) 
{ 
    //because need open imagePicker only last cell 
    //IF YOU WANT TO OPEN IMAGEPICKER CLICK ON BUTTON THEN ADD COMMENT BELOW LINE 
    if indexPath.row == self.items.count-1 
    { 
     self.configuringImagePickerController() 
    } 
} 

func buttonClicked(sender:UIButton) 
{ 
    self.configuringImagePickerController()//If you want open imagepicker click on button 
} 

func configuringImagePickerController() 
{ 
    let alertController: UIAlertController = UIAlertController(title: "Please choose a Picture".localized, message: nil, preferredStyle: UIAlertControllerStyle.ActionSheet) 
    let cameraAction = UIAlertAction(title: "Camera".localized, style: UIAlertActionStyle.Default){ 
     UIAlertAction in 
     self.openCamera() 
    } 

    let gallaryAction = UIAlertAction(title: "Gallery".localized, style: UIAlertActionStyle.Default){ 
     UIAlertAction in 
     self.openGallary() 
    } 
    let cancelAction = UIAlertAction(title: "Cancel".localized, style: UIAlertActionStyle.Cancel){ 
     UIAlertAction in 
    } 
    alertController.addAction(cameraAction) 
    alertController.addAction(gallaryAction) 
    alertController.addAction(cancelAction) 

    self.presentViewController(alertController, animated: true, completion: nil) 
} 

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) 
{ 
    selectedImage = info[UIImagePickerControllerEditedImage] as! UIImage 
    collectionView.reloadData() 
    dismissViewControllerAnimated(true, completion: nil) 
}

来源

2017-03-08 14:09:40

如果不行或您需要其他帮助，请在此处注释 –

显示弹出式缩放图像。当我点击其他单元格 –

时，请删除didSelect方法代码并检查 –

基本上你必须创建一个item类型的对象，因为它是collectionview的数据源，最后在item数组中添加该对象，并重新加载collectionview。

可能您需要在func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject])方法中执行此操作。

编辑：

var items = [UIImage]()

//可能有一些图像对象从UIImagePickerView代表接收图像

func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell { 
    let cell = collectionView.dequeueReusableCellWithReuseIdentifier("cell", forIndexPath: indexPath) as! MyCollectionViewCell 

    // cell.backgroundColor = UIColor.cyanColor() 
    // cell.btnSelectImage.setTitle(items[indexPath.row], forState: .Normal) 
    // cell.btnSelectImage.tag = indexPath.row 
    // cell.btnSelectImage.addTarget(self,action:#selector(buttonClicked), 
        forControlEvents:.TouchUpInside) 
    let choosenImage = items[indexPath.row] 
    cell.btnSelectImage.setBackgroundImage(choosenImage, forState: .Normal) 
    return cell 

} 





func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) 
{ 

    /* let timestamp = Int(NSDate().timeIntervalSince1970) 
    let choosenImage = info[UIImagePickerControllerEditedImage] as! UIImage 


    var indexPath = NSIndexPath(forRow: 0, inSection: 0) 
    let cell = collectionView.cellForItemAtIndexPath(indexPath) as! MyCollectionViewCell 

    cell.btnSelectImage.setBackgroundImage(choosenImage, forState: .Normal) 
*/ 
    let choosenImage = info[UIImagePickerControllerEditedImage] as! UIImage 
    self.items.append(choosenImage) 
    collectionView.reloadData()  
    dismissViewControllerAnimated(true, completion: nil) 

}

来源

2016-12-27 06:36:11 preetam

如何在此阵列中添加图像，以及如何在单元格按钮中显示此图像。 –

你的数据源是字符串类型和单元格没有imageview ..你想如何显示图像？ – preetam

我需要在按钮背景图像，cell.btnSelectImage.setBackgroundImage（choosenImage，forState：.Normal）从图像选择器 –

// MARK:- 
var images:[Images]=[] 
//MARK:- UICollectionViewDataSource protocol 
func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int { 
return self.images.count+1 
} 
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell { 
if indexPath.row == images.count{ 
    let cell = collectionView.dequeueReusableCellWithReuseIdentifier("newCell", forIndexPath: indexPath) as! MyNewCollectionViewCell 
return cell 
} 
else{ 
let cell = collectionView.dequeueReusableCellWithReuseIdentifier("cell", forIndexPath: indexPath) as! MyCollectionViewCell 
// cell.backgroundColor = UIColor.cyanColor() 
cell.btnSelectImage.setTitle(images[indexPath.row].image, forState: .Normal) 
cell.btnSelectImage.tag = indexPath.row 
cell.btnSelectImage.addTarget(self,action:#selector(buttonClicked), 
       forControlEvents:.TouchUpInside) 
return cell 
} 
} 
func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) 
{ 
if indexPath.row == images.count 
{ 
// call the uipicker opening method here. 
}}

型号

class Images{ 
    var image:UIImage? 
}

来源

2016-12-27 06:39:36

谢谢，那添加新单元格，但我怎么从图像选择器 –

创建一个模型来存储从uIImagePicker视图委托方法didFinishPickingMediaWithInfo收到的图像，并使用该模型的数组而不是items数组。希望你得到我想说的话？ –

是的，我明白你说什么，但我不知道如何创建模态数组。 –

我的做法将是对有一个var say itemsCount用1初始化而不是你的var items这是一个数组。也有一个图像数组。

var itemsCount = 1 
var images = [UIImage]() 

// MARK: - UICollectionViewDataSource protocol 

func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int { 
return self.itemsCount 
}

返回的itemsCount在集合视图的数据源的方法。

func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) 
{ 
if indexPath.row == self.itemsCount - 1 
{ 
    // call your alert here 
} 
}

检查是否选择了indexPath是最后一个单元格，因为按照您的要求，您需要显示imagePicker单击最后一个单元格时。

现在多加一个细胞，当图像被成功

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) 
{ 

let timestamp = Int(NSDate().timeIntervalSince1970) 
let choosenImage = info[UIImagePickerControllerEditedImage] as! UIImage 

//Change 1 
var indexPath = NSIndexPath(forRow: self.itemsCount -1, inSection: 0) 
self.images.append(choosenImage) 
let cell = collectionView.cellForItemAtIndexPath(indexPath) as! MyCollectionViewCell 

cell.btnSelectImage.setBackgroundImage(choosenImage, forState: .Normal) 
//Change 2 

self.itemsCount += 1 

collectionView.reloadData() 

dismissViewControllerAnimated(true, completion: nil) 

}

挑选，让您的代码标记为变化1和变化2的变化。并做图像缓存，因为在cellForRowAtIndexPath你没有设置图像和新的dequed单元可能会或可能不会有图像。此外，基于单元格的图像可能会有所不同。要设置您可以使用

cell.btnSelectImage.setTitle(String(self.itemsCount), forState: .Normal) 
if images.indices.contains(indexPath.row) { 
    cell.btnSelectImage.setBackgroundImage(self.images[indexPath.row], forState: .Normal) 
}

最后这将是更便宜的插入，而不是重新加载整个集合视图的新小区称号。

来源

2016-12-27 06:46:37

cell.btnSelectImage.setBackgroundImage（choosenImage，forState ：.Normal）不能工作，图像不能在单元格中显示，我如何设置背景图像 –

请问你能解释一下，我把这个代码放在哪里？ –

我刚刚编辑了我的答案。核实。为什么它没有显示，我已经在cellForRowAtIndexPath的最后一段中解释过了。 –

您的单元格没有排序填充图像，所以我会建议使用Dictionary数据结构而不是Array。将图像更新为项目词典以更改索引路径，然后重新加载数据。

var items:[Int:Any] = [1: NSNull() , 2: NSNull(), 3: NSNull(), 4: NSNull(), 5: NSNull()]

在委托调用：在图像拾取回调

func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell { 
    let cell = collectionView.dequeueReusableCellWithReuseIdentifier("cell", forIndexPath: indexPath) as! MyCollectionViewCell 

    // cell.backgroundColor = UIColor.cyanColor() 
    cell.btnSelectImage.setTitle(items[indexPath.row], forState: .Normal) 
    cell.btnSelectImage.tag = indexPath.row 

    if let choosenImage = items[indexPath.row+1] as? UIImage { 
     print(choosenImage) 
     cell.btnSelectImage.setBackgroundImage(choosenImage, forState: .Normal) 
    } else { 
     cell.btnSelectImage.setBackgroundImage(nil, forState: .Normal) 
     print("no image exist") 
    } 

    cell.btnSelectImage.addTarget(self,action:#selector(buttonClicked), 
            forControlEvents:.TouchUpInside) 
    return cell 

}

更新dictonary。

let choosenImage = info[UIImagePickerControllerEditedImage] as! UIImage 
items.updateValue(choosenImage, forKey: yourIndexPath)

来源

2016-12-27 07:20:33 kaushal

如何在单元格末尾添加CollectionView自定义单元格？

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