Question

我有一个NSMutableArray并向其添加对象，如下所示：

// Do any additional setup after loading the view.
array = [[NSMutableArray alloc] init];

[array addObject:@"Apple"];

[array addObject:@"Orange"];

[array addObject:@"Mango"];

[array addObject:@"Banana"];

但是当我尝试从JSONModelArray添加对象时仍然只显示上面的4个对象。

这是JSONModelArray代码：

//fetch the feed
_collectionBusinessFeeds = [[CollectionBusinessManager alloc] initFromURLWithString:@"http://localhost:8888/json/collectionBusinessFinal.json"
                           completion:^(JSONModel *model, JSONModelError *err) {


                               for(NSDictionary *item in _collectionBusinessFeeds.collectionBusinesses){
                                   NSLog(@"%@",item);
                                   NSString *title = [item valueForKey:@"name"];

                                   [array addObject:title];

                                   NSLog(@"%@",array);
  // here array is printing all the objects with the above 4 objects

                               }

                          }];

但是下面的返回数组只显示4个以上的对象，而不是从JSONModelArray添加的所有对象。

-(NSInteger) collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{

return [array count];
// only showing 4 above obects like Apple, Banana...
}

这是我的完整实施文件：

    #import "CollectionViewController.h"
#import "AccordionViewController.h"

#import "JSONModelLib.h"
#import "CollectionBusinessManager.h"
#import "HUD.h"

@interface CollectionViewController (){

    CollectionBusinessManager* _collectionBusinessFeeds;
}

@end

@implementation CollectionViewController

NSMutableArray* array;

- (void)viewDidLoad {
    [super viewDidLoad];

    // Do any additional setup after loading the view.
    array = [[NSMutableArray alloc] init];

    [array addObject:@"Apple"];

    [array addObject:@"Orange"];

    [array addObject:@"Mango"];

    [array addObject:@"Banana"];

    //show loader view

    [HUD showUIBlockingIndicatorWithText:@"Fetching JSON"];

    //fetch the feed
    _collectionBusinessFeeds = [[CollectionBusinessManager alloc] initFromURLWithString:@"http://localhost:8888/json/collectionBusinessFinal.json"
                               completion:^(JSONModel *model, JSONModelError *err) {
                                //hide the loader view
                                [HUD hideUIBlockingIndicator];

                                   [self.v reloadData];

                                   NSLog(@"%@", _collectionBusinessFeeds.collectionBusinesses);
                                   for(NSDictionary *item in _collectionBusinessFeeds.collectionBusinesses){
                                       NSLog(@"%@",item);
                                       NSString *title = [item valueForKey:@"name"];

                                       [array addObject:[title copy]];

                                       NSLog(@"%@",array);

                                   }

                              }];




}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}





#pragma mark collection view methods
-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {

    return 1;
}


-(NSInteger) collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{

    return [array count];
}


- (UIColor*) randomColor{
    int r = arc4random() % 255;
    int g = arc4random() % 255;
    int b = arc4random() % 255;
    return [UIColor colorWithRed:r/255.0 green:g/255.0 blue:b/255.0 alpha:1];
}


-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {



    UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"Cell" forIndexPath:indexPath];

    UILabel *label = (UILabel *) [cell viewWithTag:100];
    label.text = [array objectAtIndex:indexPath.row];

    cell.backgroundColor = [self randomColor];

    return cell;


}


-(void)collectionView:(UICollectionView *)collectionView didDeselectItemAtIndexPath:(NSIndexPath *)indexPath{

    AccordionViewController *detailVC = [[AccordionViewController alloc] init];
    detailVC.passParam= [array objectAtIndex:indexPath.row];
    detailVC.title = detailVC.passParam;

    [self.navigationController pushViewController:detailVC animated:YES];
}





/*


 #pragma mark - Navigation





 // In a storyboard-based application, you will often want to do a little preparation before navigation


 - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {


 // Get the new view controller using [segue destinationViewController].


 // Pass the selected object to the new view controller.


 }


 */

@end

任何人都可以帮助我吗？

更新最后它解决了我添加如下属性的问题：

@property (weak, nonatomic) IBOutlet UICollectionView *collectionView;

[self.collectionView reloadData];

Answer 1

//fetch the feed
_collectionBusinessFeeds = [[CollectionBusinessManager alloc] initFromURLWithString:@"http://localhost:8888/json/collectionBusinessFinal.json"
                           completion:^(JSONModel *model, JSONModelError *err) {


                               for(NSDictionary *item in _collectionBusinessFeeds.collectionBusinesses){
                                   NSLog(@"%@",item);
                                   NSString *title = [item valueForKey:@"name"];

                                   [array addObject:title];

                                   [collectionView reloadData];

                                   NSLog(@"%@",array);

                               }

                          }];
I have edited code, please check above code.

Answer 2

对于您所描述的内容，似乎在集合视图计算了项目数后调用了fetch。您必须在获取新结果后重新加载集合视图。

Answer 3

<强>已更新

angular.module('app').controller('MyController',['$scope', function($scope){ //$scope in function here

      $(document).ready(function () { 

      var form = $scope.Form1; // undefined

      }]);
  });

旧答案 如果将__block添加到数组初始化中，它必须有效。

    #import "CollectionViewController.h"
    #import "AccordionViewController.h"

    #import "JSONModelLib.h"
    #import "CollectionBusinessManager.h"
    #import "HUD.h"

    @interface CollectionViewController (){

        CollectionBusinessManager* _collectionBusinessFeeds;
    }
    @property (nonatommic, strong) NSMutableArray *array;
    @end

    @implementation CollectionViewController


    - (void)viewDidLoad {
        [super viewDidLoad];

        // Do any additional setup after loading the view.
        self.array = [[NSMutableArray alloc] init];
        [self.array addObject:@"Apple"];

        [self.array addObject:@"Orange"];

        [self.array addObject:@"Mango"];

        [self.array addObject:@"Banana"];

        But when I try to add object from JSONModelArray still showing the above 4 object only.

        Here is JSONModelArray code:

        //fetch the feed
        __weak typeof(self) weakSelf = self;
        _collectionBusinessFeeds = [[CollectionBusinessManager alloc]                                            initFromURLWithString:@"http://localhost:8888/json/collectionBusinessFinal.json"
                               completion:^(JSONModel *model, JSONModelError *err) {


                           for(NSDictionary *item in _collectionBusinessFeeds.collectionBusinesses){
                               NSLog(@"%@",item);
                               NSString *title = [item valueForKey:@"name"];

                               [weakSelf.array addObject:title];

                               NSLog(@"%@", weakSelf.array);
  // here array is printing all the objects with the above 4 objects

                           }

                      }];

NSMutableArray无法从JSONModelArray添加对象？

3 个答案: