Parse.com數據在iOS中獲取“ NULL”值

Question

我是parse.com的新手，並嘗試了更多時間從中獲取數據，但每次都提供NULL值。 在這里，在我的Parse表中包含1.89k行，因此我想檢查所有行並從中獲取數據。 對於數據獲取，我編寫了如下代碼

-(void)getdata
{
NSMutableArray *allObjects = [[NSMutableArray alloc]init];
NSUInteger limit = 1000;
__block NSUInteger skip = 0;
PFQuery *query = [PFQuery queryWithClassName:@"MapInfo"];
[query whereKey:@"Type" equalTo:@"Business"];
[query whereKey:@"Admin" equalTo:self.bisusername];
[query setLimit: limit];
[query setSkip: skip];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
    if (!error) {
        [allObjects addObjectsFromArray:objects];
        if (objects.count == limit) {
            skip += limit;
            [query setSkip: skip];
            [query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
                [allObjects addObjectsFromArray:objects];
                self.qpinname=[allObjects valueForKey:@"GPIN"];
                NSLog(@"Qpin Array %lu",(unsigned long)[self.qpinname count]);
                self.locationArray=[allObjects valueForKey:@"Location"];
                self.latitude=[self.locationArray valueForKey:@"lat"];
                self.longitude=[self.locationArray valueForKey:@"lng"];
                self.address=[allObjects valueForKey:@"Address"];
                self.usernameArray=[allObjects valueForKey:@"AddedBy"];
                self.buildingNameArray=[allObjects valueForKey:@"BuildingName"];
                self.businessHourArray=[allObjects valueForKey:@"OfficeTiming"];
                self.parkingInfoArry=[allObjects valueForKey:@"Parking"];
                self.officenoArray=[allObjects valueForKey:@"DoorNumber"];
                NSLog(@"Office Array %@",self.officenoArray);
              hudView.hidden=TRUE;
            }];
        }
    }
    else
    {
        NSLog(@"Error: %@ %@", error, [error userInfo]);
    }
}];
}

當我寫像這樣的代碼

-(void)getdata
 {
PFQuery *query = [PFQuery queryWithClassName:@"MapInfo"];
[query whereKey:@"Type" equalTo:@"Business"];
[query whereKey:@"Admin" equalTo:self.bisusername];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
    if (!error)
    {
        self.qpinname=[objects valueForKey:@"GPIN"];
        self.locationArray=[objects valueForKey:@"Location"];
        self.latitude=[self.locationArray valueForKey:@"lat"];
        self.longitude=[self.locationArray valueForKey:@"lng"];
        self.address=[objects valueForKey:@"Address"];
        self.usernameArray=[objects valueForKey:@"AddedBy"];
        self.buildingNameArray=[objects valueForKey:@"BuildingName"];
        self.businessHourArray=[objects valueForKey:@"OfficeTiming"];
        self.parkingInfoArry=[objects valueForKey:@"Parking"];
        self.officenoArray=[objects valueForKey:@"DoorNumber"];
    }
    else
    {
        NSString *errorString = [[error userInfo] objectForKey:@"error"];
        NSLog(@"Error: %@", errorString);
    }
}];
}

然后我從表中獲得了價值，但它僅從我要從整個表中獲得價值的一頁就給了我價值，請給我解決方案。

Answer 1

您根本不需要迭代對象數組。 您正在執行以下操作：

self.qpinname=[allObjects valueForKey:@"GPIN"];

allObjects是一個ARRAY而不是一個字典。 您需要迭代數組並以這種方式訪問​​對象。 請記住，對象是從Parse.com下載的PFObject類型。 例如：

[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
                [allObjects addObjectsFromArray:objects];
                for(PFObject *object in allObjects) {

                //now you can access things,e.g....
                self.locationArray=object[@"Location"]; 
                //and so on...



               }

            }];

那應該解決它。 確保在循環中也使用上面的PFObject。