我在情节提要中创建了一个表视图,并试图填充ViewController中的行。当我调用[self.tableView]时,它不会刷新内容(它不会调用cellForRowAtIndexPath)。

SetListViewController.h:

#import <UIKit/UIKit.h>

@interface SetListViewController : UITableViewController

@end


SetListViewController.m

#import "SetListViewController.h"
#import "SetCell.h"
#import "Set.h"

@interface SetListViewController () <UITableViewDataSource, UITableViewDelegate>
{
    NSMutableArray *userSets; // array containing all the user's set objects
}
@implementation SetListViewController

- (void)viewDidLoad {
   [super viewDidLoad];
   self.userSets = [[NSMutableArray alloc] init];
   [self.tableView setDataSource:self];
   [self.tableView setDelegate:self];
   // load sets
   [self fetchSets];
}

- (void)fetchSets{
        for(NSDictionary *currentSet in set){
           Set *userSet = [[Set alloc] init];
           userSet.name = [currentSet objectForKey:@"name"];
           [userSets addObject:UserSet];
        }
       [self.tableView reloadData];
    }

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return self.userSets.count;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return self.userSets.count;
}

- (SetCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    NSLog(@"in cellForRowAtIndexPath");
    SetCell *cell = [tableView dequeueReusableCellWithIdentifier:@"setCell" forIndexPath:indexPath];
    NSDate *object = self.userSets[indexPath.row];
    cell.setTitleLabel.text = [object description];
    NSLog(@"setTitleLabel: %@", cell.setTitleLabel);
    return cell;
}

- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath {
    // Return NO if you do not want the specified item to be editable.
    return YES;
}

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
    if (editingStyle == UITableViewCellEditingStyleDelete) {
        NSLog(@"deleting set");
        [self deleteSet:(NSString *)[self.userSets objectAtIndex:indexPath.row]];
        NSLog(@"set ID: %@", [self.userSets objectAtIndex:indexPath.row]);
        [self.userSets removeObjectAtIndex:indexPath.row];
        [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
    } else if (editingStyle == UITableViewCellEditingStyleInsert) {
        // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view.
    }
}
@end


我究竟做错了什么?

最佳答案

我认为问题在于您有一个名为userSets的属性,还有一个名为userSets的ivar(我假设您有一个属性,即使您未显示它,因为使用self.userSets会给您带来错误)。在viewDidLoad中,您实例化了该属性,但是在fetchSets中,您尝试使用[userSets addObject:UserSet]填充ivar,但从未初始化该数组。您应该摆脱ivar,并始终将您的属性称为self.userSets。

关于ios - UITableView不会在reloadData上重新加载,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/29652932/

10-09 01:12