Question

我有一个包含几个项目的NSArray。 NSArray从另一个类加载到uitableview中。当我退出详细视图并重新进入（第3次）时，NSArray为空，tableview也是空的。怎么了？（我正在使用arc，所以我不认为这是泄漏）

- (void)viewDidLoad {

    myMatch = [[Match alloc] initWithId:1 OpponentId:13];
}


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

    static NSString *askCellIdent = @"askCell";
    static NSString *answerCellIdent = @"answerCell";


    if (indexPath.row == 0)
    {

        AskCell *cell = [tv dequeueReusableCellWithIdentifier:askCellIdent];
        if (cell==nil) {
            cell = [[AskCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:askCellIdent];
        }

        cell.nameLabel.text = @"Albert asked:";
        cell.questionLabel.text = [NSString stringWithFormat:@"%@", [[myMatch.chat objectAtIndex:indexPath.row] objectAtIndex:1]];
        return cell;
    }
    if (indexPath.row == 1)
    {

        AnswerCell *cell = [tv dequeueReusableCellWithIdentifier:answerCellIdent];
        if (cell==nil) {
            cell = [[AnswerCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:answerCellIdent];
        }

        cell.nameLabel.text = @"Hugh answered:";
        cell.answerLabel.text = [NSString stringWithFormat:@"%@", [[myMatch.chat objectAtIndex:indexPath.row] objectAtIndex:1]];
        return cell;
    }

}

以下是我的匹配类的初始化代码：

- (id) initWithId:(NSInteger)yourId OpponentId:(NSInteger)opId {
    self = [super init];
    if (self != nil) {
        //set your id and opponents id to the match.
        [self setUserId:yourId];
        [self setUserId:opId];

        JSON = @"[{\"opponentId\":\"4\",\"chat\":[[\"1\",\"Does he have a beard?\"],[\"1\",\"No.\"]]}]";

        //initiate the chat array.
        chat = [[NSMutableArray alloc] init ];
        [self loadMatch];


    }
    return self;
}

这是聊天属性/合成

NSMutableArray *chat;

@property (nonatomic, retain) NSMutableArray *chat;

@synthesize chat;

不知道发生了什么事，因为阵列的混乱也是空的！

Answer 1

使用self.chat = [[[NSMutableArray alloc] init] autorelease];初始化你的数组

Answer 2

而不是ViewDidLoad，在initWithCoder中分配对象。

- (void)viewDidLoad
{
   [super viewDidLoad];
}

-(id)initWithCoder:(NSCoder *)aDecoder
{
    self = [super initWithCoder:aDecoder];
    if( self )
    {
       myMatch = [[Match alloc] initWithId:1 OpponentId:13];
    }
return self;
}

Answer 3

在appDelegate中声明一个int varable repeatCount

- (void)viewDidLoad
{
    [super viewDidLoad];
    ypurAppDelegate *appDelegate = (yourAppDelegate *)[[UIApplication sharedApplication]   elegate];


          appDelegate.repeatCount++;

       if(appDelegate.repeatCount %3==0)
       {
           [array removeAllObjects];
            [tableview reloaddata];
        }
}

Answer 4

我认为填充NSMutableArray是一个问题，因为只会调用viewDidLoad一次viewWillAppear。您应该在initWithCoder方法中将值插入数组，或在{{1}}中启动匹配类。

3次视图加载后NSArray清除

4 个答案: