UiCollectionView 单元格选择错误

Question

我已经使用 Alamofire 和 SwiftyJSON 来填充 UiCollectionview 并且它工作正常，但是 didSelectItemAtIndexPath 函数显示数组超出索引我认为我已经打印了数组计数并且它不是空的

任何建议

这是我的代码：-

型号

import Foundation

class ProductModel {
private var _ProductItemId: String!
private var _ProductMainCategory: String!
private var _ProductCategoryId: String!
private var _ProductName: String!
private var _ProductItemNo: String!
private var _ProductAvalaibility: String!
private var _ProductSeoDesc: String!
private var _ProductImageURL: String!
private var _ProductBrand_ID: String!
private var _ProductCat_name: String!

//Level 1
private var _ProductTotalQuantity : String!
private var _Productprice : String!
private var _ProductSalePrice : String!
private var _ProductWeightName : String!
private var _ProductCode : String!




var ProductItemId : String {
    return _ProductItemId
}

var ProductMainCategory : String {
    return _ProductMainCategory
}

var ProductCategoryId : String {
    return _ProductCategoryId
}

var ProductName : String {
    return _ProductName
}

var ProductItemNo : String {
    return _ProductItemNo
}

var ProductAvalaibility : String {
    return _ProductAvalaibility
}

var ProductSeoDesc : String {
    return _ProductSeoDesc
}

var ProductImageURL : String {
    return _ProductImageURL
}

var ProductBrand_ID: String {
    return _ProductBrand_ID
}

var ProductCat_name: String {
    return _ProductCat_name
}

//Level 1
var ProductTotalQuantity : String {
    return _ProductTotalQuantity
}

var Productprice : String {
    return _Productprice
}

var ProductSalePrice : String {
    return _ProductSalePrice
}

var ProductWeightName : String {
    return _ProductWeightName
}

var ProductCode : String {
    return _ProductCode
}



//Initilizer
init(ProductImageURL : String, ProductName : String, Productprice : String, ProductSalePrice : String)
{

    self._ProductName = ProductName
    self._ProductImageURL = ProductImageURL//

    //Level 1
    self._Productprice = Productprice//
    self._ProductSalePrice = ProductSalePrice//

}

我的 CollectionView 委托和数据源

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

        let _prod: ProductModel!
            _prod = prod [indexPath.row]
        cell.configureCell(_prod)
        return cell
    }
    else{
        return UICollectionViewCell()
    }


}

func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
    let prodDetail: ProductModel!
    prodDetail = prod[indexPath.row] //error Array index out of range 
    print(prodDetail.Productprice)
    performSegueWithIdentifier("productDetailSegue", sender: prodDetail)

}

func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    //if inSearchMode{
        //return filteredProd.count
  //  }
    return prod.count
}

func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int {
    return 1
}

调用API和解析

    Alamofire.request(.POST, "http://www.picknget.com/webservice/index.php/Home/filter_grocery_product_practice/", parameters: parameterDictionary as? [String : AnyObject])
        .responseJSON { response in
            if let value = response.result.value {
                let json = JSON(value)
                print(json)
                if let _statusCode = json["status"].string {
                    // print("the ststus code is ", _statusCode)
                    if (_statusCode == "1"){
                        self.parseJSON(json)
                    }
                    if (_statusCode == "0"){
                        SwiftSpinner.hide({
                            self.callAlert("OOP's", _msg: "No More Product is available in this section right now")
                        })
                    }
                }
                //print ("json result ", json)

            }
        }.responseString { response in
            //print("response ",response.result.value)
    }
}

func parseJSON(json: JSON) {
    for result in json["cat"].arrayValue {
        let name = result["Name"]

        let aString: String = "\(result["ImageURL"])"
        let product_Image_Url  = aString.stringByReplacingOccurrencesOfString("~", withString: "http://www.picknget.com", options: NSStringCompareOptions.LiteralSearch, range: nil)
        let price = result["cat_price"][0]["Price"].string
        let SalePrice = result["cat_price"][0]["SalePrice"].string


        let product = ProductModel(ProductImageURL: "\(product_Image_Url)", ProductName: "\(name)", Productprice: "\(price!)", ProductSalePrice: "\(SalePrice!)")
        prod.append(product)
    }

    print("@@@@@@@@")
    print(prod.count)
    dispatch_async(dispatch_get_main_queue(),{
        self.productCollect.reloadData()
    });
}

Answer 1

根据您的 cmets，我认为问题与您如何为 Collection View 设置获取的产品有关。

函数parseJSON 很可能在辅助线程上执行。这实际上是方法responseJSON的完成处理程序的相同执行上下文。

在函数parseJSON 中有这样的语句：

    prod.append(product)

这里，prod 应该不是全局变量或不视图控制器的成员变量！使其成为函数parseJSON中的局部变量！

您的视图控制器也应该具有该数组的属性，例如products。这充当视图控制器的“模型”。只能从主线程访问。

在parseJSON 中为视图控制器分配产品如下：

func parseJSON(json: JSON) {
    var tmpProducts: [Product] = []
    for result in json["cat"].arrayValue {
        let name = result["Name"]

        let aString: String = "\(result["ImageURL"])"
        let product_Image_Url  = aString.stringByReplacingOccurrencesOfString("~", withString: "http://www.picknget.com", options: NSStringCompareOptions.LiteralSearch, range: nil)
        let price = result["cat_price"][0]["Price"].string
        let SalePrice = result["cat_price"][0]["SalePrice"].string


        let product = ProductModel(ProductImageURL: "\(product_Image_Url)", ProductName: "\(name)", Productprice: "\(price!)", ProductSalePrice: "\(SalePrice!)")
        tmpProducts.append(product)
    }

    dispatch_async(dispatch_get_main_queue(),{
        self.products = tmpProducts   // assuming `self` is the ViewController
        self.productCollect.reloadData()
    });
}

注意：您需要相应地更改您的数据源委托，例如访问“模型”（self.products.count）等