ios - 数组计数的 UITableView 问题

Question

你能看看这段代码吗

#import "ViewController.h"
#import "DataService.h"


@interface ViewController ()

@property (weak, nonatomic) IBOutlet UITableView *TableView;
@property (strong, nonatomic) DataService *Service;
@property (nonatomic, strong)   MSTable *table;
//@property (nonatomic, strong)   MSClient *client;
@property (nonatomic, strong)   NSMutableArray *items;

@end

@implementation ViewController

@synthesize Service;
@synthesize rowitems;

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    self.client = [MSClient clientWithApplicationURLString:@"https://outnight-mobile.azure-mobile.net/"
                                            applicationKey:@"okYeRGfBagYrsbkaqWIRObeDtktjkF10"];
    self.table = [self.client tableWithName:@"notifications"];
    self.rowitems = [[NSMutableArray alloc] init];
    MSQuery *query = [self.table query];
    query.fetchLimit = 5;
    [query readWithCompletion:^(NSArray *items, NSInteger totalCount, NSError *error)
     {
         //add the items to our local cop
         self.rowitems = [items mutableCopy];


     }];
    [self.TableView reloadData];



}


- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView
 numberOfRowsInSection:(NSInteger)section {
    //return 5;
     NSLog(@"%d",[self.rowitems count]);
    return 5;


}



-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{

        UITableViewCell *cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"Cell"];
        cell.textLabel.text = @"fool";
        return cell;
}


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

@end

这个 UTTableView 应该进入数据库(这很好)并且它应该检索回前 5 行并且确实如此。但是当我

numberofrowsinsection 在我进行数组计数时没有看到 5 的数量？？这让我发疯，我做错了什么？
谢谢

Answer 1

这段代码:

[query readWithCompletion:^(NSArray *items, NSInteger totalCount, NSError *error)
 {
     //add the items to our local cop
     self.rowitems = [items mutableCopy];
 }];

是一个异步网络调用(到 Azure)。因此，您需要在调用完成并存储结果后重新加载表。当前，当您重新加载 TableView 时，self.rowitems 数组为空。

因此，在 block 内调用 reloadData。

[query readWithCompletion:^(NSArray *items, NSInteger totalCount, NSError *error)
 {
     //add the items to our local cop
     self.rowitems = [items mutableCopy];

     [self.TableView reloadData];
 }];