Question

我的问题非常奇怪，所以我无法搜索它我有一个模特

@implementation newChatMessage

@synthesize miDProperty = _miDProperty;
@synthesize mUserName = _mUserName;
@synthesize mUID = _mUID;
@synthesize mPhoto = _mPhoto;
@synthesize mDate = _mDate;
@synthesize mText = _mText;
@synthesize SeenBy = _SeenBy;
@end



@interface newChatMessage : NSObject

@property (nonatomic, assign) NSString *miDProperty;
@property (nonatomic, strong) NSString *mDate;
@property (nonatomic, strong) NSString *mText;
@property (nonatomic, strong) NSString *mPhoto;
@property (nonatomic, strong) NSString *mUID;
@property (nonatomic, strong) NSString *mUserName;
@property (nonatomic, strong) NSArray *SeenBy;

@end

然后我根据来自fireBase数据库

的数据定义一个对象

Allmessages = [[NSMutableArray alloc]init];
    ref = [[FIRDatabase database]reference];
    [[[ref child:@"classes"]child:_classname]observeSingleEventOfType:FIRDataEventTypeValue withBlock:^(FIRDataSnapshot * _Nonnull snapshot) {
        NSEnumerator *children = [snapshot children];

        printf("%s", snapshot.key);
        FIRDataSnapshot *child;
        while (child = [children nextObject]) {
            NSDictionary *obj = (NSDictionary*)child.value;
            newChatMessage* msg = [[newChatMessage alloc]init];
            //NSString *texte = [child ]
            msg.miDProperty = [NSString stringWithFormat:@"%@",child.key];//here its run good
            msg.mText = [obj objectForKey:@"mText"];
            msg.mDate = [obj objectForKey:@"mDate"];
            msg.mPhoto = [obj objectForKey:@"mPhoto"];
            msg.mUID = [obj objectForKey:@"mUID"];
            msg.mUserName = [obj objectForKey:@"mUserName"];
            msg.SeenBy = [obj objectForKey:@"SeenBy"];
            lastOne = child.key;
            [Allmessages addObject:msg];
        }
        [self.collectionView reloadData];
        if (lastOne != nil)
            [self lesitner];
    }];

这项工作很好，所有属性都有正确的价值但在完成并开始重新加载集合视图iDproperty后，更改其值并键入

- (UICollectionViewCell *)collectionView:(JSQMessagesCollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    JSQMessagesCollectionViewCell *cell = [super  collectionView:collectionView cellForItemAtIndexPath:indexPath];//here iDproperty type and value changes
    newChatMessage* currentMSG = Allmessages[indexPath.row];
    NSLog(@"%ld", (long)indexPath.row);
    NSLog(@"%ld", (long)indexPath.item);
    [[[[[ref child:@"classes"]child:_classname]child:currentMSG.miDProperty]child:@"SeenBy"]setValue:[self senderId]];
    return cell;
}

Answer 1

我的问题在于将nsstring定义为assign althaugh必须是strong

@property (nonatomic, strong) NSString *miDProperty;

NSMutableArray对象属性更改其类型和值错误

1 个答案: