Question

我从服务器获取表数据。它是一个JSON数据，每个数组都保存为字典。我有一组JSON对象。

JSON是：

{
    sAlbum = Fallen;
    sArtist = Evanescence;
    sId = 1;
    sRate = 3;
    stitle = "Everybody's Fool";
},
    {
    sAlbum = Fallen;
    sArtist = Evanescence;
    sId = 2;
    sRate = 4;
    stitle = "Going Under";
}

当我拥有它时（使用AFnetwrking）

[AFJSONRequestOperation JSONRequestOperationWithRequest:request
 // The success block runs when (surprise!) the request succeeds.
                                                success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {

                                                    self.musicLibraryArr  = [(NSDictionary*)JSON  objectForKey:@"array"];


                                                    NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"stitle" ascending: YES];
                                                    NSArray *sortedArray = [self.musicLibraryArr sortedArrayUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]];

                                                    self.musicLibraryArr = [[NSMutableArray alloc] initWithArray:sortedArray];

                                                    self.loadingView.hidden = YES;

                                                    // partition
                                                    self.tableData = [self partitionObjects:self.musicLibraryArr collationStringSelector:@selector(self)];
                                                    NSLog(@"HEADER: %@", self.tableData);

                                                    [self.tableView reloadData];
                                                }

现在我调用self.tableData = [self partitionObjects：self.musicLibraryArr collationStringSelector：@selector（self）];为了创建节数组

但我得到的部分是A到Z，在每个部分我都有JSON数据（数据在每个部分都重复，而不是将数据拆分成部分）。

分区方法是：

-(NSArray *)partitionObjects:(NSArray *)array collationStringSelector:(SEL)selector

{ UILocalizedIndexedCollation * collation = [UilocalizedIndexedCollation currentCollation]; NSInteger sectionCount = [[collation sectionTitles] count]; NSMutableArray * unsortedSections = [NSMutableArray arrayWithCapacity：sectionCount];

for (int i = 0; i < sectionCount; i++) {
    [unsortedSections addObject:[NSMutableArray array]];
}

for (id object in array) {
    NSInteger index = [collation sectionForObject:[object objectForKey:@"sArtist"] collationStringSelector:selector];
    [[unsortedSections objectAtIndex:index] addObject:object];
}

NSMutableArray *sections = [NSMutableArray arrayWithCapacity:sectionCount];
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"sArtist" ascending:YES selector:@selector(localizedCaseInsensitiveCompare:)];
NSArray *sortDescriptors = [NSArray arrayWithObject:sortDescriptor];


for (NSMutableArray *section in unsortedSections) {
    NSArray *sortedArray = [section sortedArrayUsingDescriptors:sortDescriptors];

// collationStringSelector：selector]]; [sections addObject：sortedArray]; }

return sections;

}

编辑 - ＃2 我在这里初始化了数据：

AFJSONRequestOperation *operation =
[AFJSONRequestOperation JSONRequestOperationWithRequest:request
 // The success block runs when (surprise!) the request succeeds.
                       success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
                                      self.noMusicView.hidden = YES;

//从json数组中获取数据数据 self.musicLibraryArr = [（NSDictionary *）JSON objectForKey：@“array”]; NSLog（@“JSON DATA：％@”，self.musicLibraryArr）; //对数组进行排序 NSSortDescriptor * sortDescriptor = [[NSSortDescriptor alloc] initWithKey：@“stitle”ascending：YES]; NSArray * sortedArray = [self.musicLibraryArr sortedArrayUsingDescriptors：[NSArray arrayWithObject：sortDescriptor]];

                                        self.musicLibraryArr = [[NSMutableArray alloc] initWithArray:sortedArray];

                                        self.loadingView.hidden = YES;
                                         self.indexPathController.dataModel = [[TLIndexPathDataModel alloc] initWithItems:self.musicLibraryArr                                                   andSectionNameKeyPath:@"sTitle"                                              andIdentifierKeyPath:@"sId"];

// HERE I GET NULL（我检查是否可以在NSLog中看到数据）

                                                  NSLog(@"DATA MODEL %@", self.indexPathController.dataModel);

                                                    [self.tableView reloadData];
                                                }
 // The failure block runs if something goes wrong, such as when the network isn’t available. If that happens, you display an alert view with an error message.
                                                failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {
                                 // Error view
                                 self.noMusicView.hidden = NO;
                                 self.loadingView.hidden = YES;
                                 self.noMusicViewLabel.text = error.localizedDescription;
                                                }];

可能我在partitionObjects方法中遗漏了一些东西，请帮忙

Answer 1

您可以使用TLIndexPathTools尝试解决方案here。这种方法使您不必自己操纵传入的数据。您只需提供一系列词典和sectionNameKeyPath即可。请参阅示例代码。

编辑根据您在下面的评论，我添加了一个示例项目，演示了UIViewController中嵌入的表视图，其中TLIndexPathTools的依赖性最小。尝试运行Minimal project。视图控制器的来源如下：

#import <UIKit/UIKit.h>

#import "TLIndexPathController.h"

@interface ViewController : UIViewController <TLIndexPathControllerDelegate, UITableViewDataSource>
@property (strong, nonatomic) IBOutlet UITableView *tableView;
@end

#import "ViewController.h"

@interface ViewController ()
@property (strong, nonatomic) TLIndexPathController *indexPathController;
@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.indexPathController = [[TLIndexPathController alloc] initWithItems:@[
                                @"Chevrolet",
                                @"Bubble Gum",
                                @"Chalkboard"]
                                ];
}

#pragma mark - UITableViewDataSource

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return self.indexPathController.dataModel.numberOfSections;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [self.indexPathController.dataModel numberOfRowsInSection:section];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell"];
    NSString *title = [self.indexPathController.dataModel itemAtIndexPath:indexPath];
    cell.textLabel.text = title;
    return cell;
}

#pragma mark - TLIndexPathControllerDelegate

- (void)controller:(TLIndexPathController *)controller didUpdateDataModel:(TLIndexPathUpdates *)updates
{
    [updates performBatchUpdatesOnTableView:self.tableView withRowAnimation:UITableViewRowAnimationFade];    
}

@end

以此为基础，您可以配置链接帖子中显示的数据模型。

编辑＃2 数据模型配置如下所示：

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.indexPathController = [[TLIndexPathController alloc] init];

    //if you get your JSON asynchronously, you would make the request after initializing
    //the index path controller, possibly right here. Assuming your JSON request
    //passes the result back through a callback block, the block would process
    //the incoming array like this block:
    ^(NSArray *jsonData){
        self.indexPathController.dataModel = [[TLIndexPathDataModel alloc] initWithItems:jsonData
                                                                   andSectionNameKeyPath:@"sTitle"
                                                                  andIdentifierKeyPath:@"sId"];
    };

    //or if you already have the data, just set the data model directly:
    self.indexPathController.dataModel = [[TLIndexPathDataModel alloc] initWithItems:jsonData
                                                           andSectionNameKeyPath:@"sTitle"                                                         
                                                           andIdentifierKeyPath:@"sId"];
}

如果需要动态更新数据，只需创建一个如上所示的新数据模型，然后再次设置索引路径控制器的dataModel属性。控制器将调用其controller:didUpdateDataModel方法，如上面的示例代码所示，代理将在更新对象上调用performBatchUpdatesOnTableView:，从而使新数据流畅地生成动画。

在NSDictionary的TableView中创建部分

1 个答案: