ios - 属性数组不添加对象，临时数组会。

Question

所以我有这个方法，我在其中查询一些 Singleton 类以获取数据，我将它添加到我的名为配置文件详细信息的可变数组中，但是如果我先将它添加到临时数组然后使用它，它不会被添加将其分配给我的个人资料详细信息数组是否有效？这里发生了什么？

//Property declaration 
@property (nonatomic, strong) NSMutableArray *profileDetails;

//Method definition
- (void) getAllProfiles : (NSArray *) profiles
{
if (_myHealthDetailService == nil) {
    self.myHealthDetailService = [[MyHealthDetailService alloc] init];
}

if (profiles) {

    if (self.currentProfileCounter < [profiles count]) {

        MyHealth *profile = [profiles objectAtIndex:self.currentProfileCounter];

        [self.myHealthDetailService requestForMyHealthDetailWithHealth:profile completion:^(NSArray *healths) {

            self.currentProfileCounter = self.currentProfileCounter + 1;

            if (healths) {

                NSMutableArray *tempArray = [NSMutableArray arrayWithCapacity:healths.count];

                for (MyHealth *profile in healths) {

                    NSLog(@"Adding Proile: %@",profile);


                    [self.profileDetails addObject:profile];

                    [tempArray addObject:profile];

                    NSLog(@"Proile details array after adding %@ profile is: %@",profile, self.profileDetails);

                    NSLog(@"Temp Proile details array after adding %@ profile is: %@",profile, tempArray);


                }

                self.profileDetails = tempArray;
                NSLog(@"Proile details array after copying is: %@",self.profileDetails);


            }

            DashboardHealthCell_iPad *cell = (DashboardHealthCell_iPad *)[self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForItem:DashboardRow_iPadTypeHealth inSection:0]];

            NSLog(@"Proile details array is: %@",self.profileDetails);

            [cell populateMyHealthProfiles:self.profileDetails];

        } failureBlock:^(NSError *error) {

        }];
    }
}
}

相关的 NSLog 输出:

2014-03-12 12:45:58.144 CHM[9768:70b] Proile details array after adding <MyHealth: 0xd562ce0>     profile is: (null)
2014-03-12 12:45:58.144 CHM[9768:70b] Temp Proile details array after adding <MyHealth: 0xd562ce0> profile is: (
"<MyHealth: 0xd562270>",
"<MyHealth: 0xd5629e0>",
"<MyHealth: 0xd562ce0>"
)
2014-03-12 12:45:58.144 CHM[9768:70b] Proile details array after copying is: (
"<MyHealth: 0xd562270>",
"<MyHealth: 0xd5629e0>",
"<MyHealth: 0xd562ce0>"
)

Answer 1

问题似乎是 self.profileDetails 在您调用时为零

 [self.profileDetails addObject:profile];

没有地方可以alloc/init 该数组，因此不会添加任何内容。你可能可以摆脱你的 tempArray 做

// this
profileDetails = [NSMutableArray arrayWithCapacity:healths.count];
// instead of this
NSMutableArray *tempArray = [NSMutableArray arrayWithCapacity:healths.count];