ios - Obj-c - 使用更新的 NSMutableArray 重新加载 tableView

Question

我正在尝试使用新数据(self.filtered，NSMutableArray)重新加载我的tableView。为了做到这一点，我的理解是我需要从原始 self.filtered 中删除所有对象，然后用更新的 NSMutableArray 重新填充它。然而，由于某种原因，当我运行下面的命令时，我收到以下崩溃错误(是的，所有值都按应有的方式填充......例如没有空响应):

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSArrayI removeAllObjects]: unrecognized selector sent to instance 0x28009c540'

Viewcontroller.h

@property (nonatomic, strong) NSMutableArray *filtered;

ViewController.m

-(void)viewDidLoad {
    NSString *myID = [session user][@"user"][@"uid"];

    NSPredicate *p1 = [NSPredicate predicateWithFormat:@"uid ==[cd] %@", targetedUser];
    NSPredicate *p2 = [NSPredicate predicateWithFormat:@"targetuser ==[cd] %@", myID];
    NSPredicate *p3 = [NSPredicate predicateWithFormat:@"uid ==[cd] %@", myID];
    NSPredicate *p4 = [NSPredicate predicateWithFormat:@"targetuser ==[cd] %@", targetedUser];
    NSPredicate *p5 = [NSPredicate predicateWithFormat:@"targetuser ==[cd] %@", universal];

    NSCompoundPredicate *pIntermediary1 = [NSCompoundPredicate andPredicateWithSubpredicates:@[p1, p2]];
    NSCompoundPredicate * pIntermediary2 = [NSCompoundPredicate andPredicateWithSubpredicates:@[p3, p4]];
    NSCompoundPredicate * pIntermediary3 = [NSCompoundPredicate andPredicateWithSubpredicates:@[p1, p5]];
    NSCompoundPredicate *pFinal = [NSCompoundPredicate orPredicateWithSubpredicates:@[pIntermediary1, pIntermediary2, pIntermediary3]];

    self.filtered = [self.messages filteredArrayUsingPredicate:pFinal];
}

- (IBAction)sendReply:(id)sender {
    NSMutableArray *aArr = [NSMutableArray arrayWithObjects:self.filtered,nil];
    NSLog(@"BEFORE IT %@", aArr);

    [aArr addObject:nodeData];

    [self.filtered removeAllObjects];
    [self.filtered addObject:aArr];

    [self.tableView reloadData];
    NSLog(@"LASTLY %@", self.filtered);
}

此方法中没有 NSArray - 只有 NSMutableArray，所以我不确定为什么会发生这种情况？

Answer 1

行:

self.filtered = [self.messages filteredArrayUsingPredicate:pFinal];

给你一个NSArray，而不是一个NSMutableArray。

将其更改为:

self.filtered = [[self.messages filteredArrayUsingPredicate:pFinal] mutableCopy];

然后你的代码就会工作得更好。在尝试设置 filtered 属性的任何行上检查这一点。

与该问题不同的是以下行:

[self.filtered addObject:aArr];

这是将数组添加到数组中，而不是直接将aArr的对象添加到filtered中。

将此行更改为:

[self.filtered addObjectsFromArray:aArr];

或替换行:

[self.filtered removeAllObjects];
[self.filtered addObject:aArr];

与:

self.filtered = aArr;