據我所知,我需要在調用reloadData之前更改數據源中的數據。我的問題是我不確定這是如何完成的,爲什麼我的getData方法不覆蓋當前單元格。是否有必要使用子視圖呢?或者當調用刷新以創建一組新數據時,是否有辦法重置單元格?reloadData正在堆疊舊數據的ontop
@property (nonatomic,strong) NSMutableArray *objectHolderArray;
@end
@implementation MartaViewController
- (void)viewDidLoad
{
[super viewDidLoad];
[self getData];
//to add the UIRefreshControl to UIView
UIRefreshControl *refreshControl = [[UIRefreshControl alloc] init];
refreshControl.attributedTitle = [[NSAttributedString alloc] initWithString:@"Please Wait..."];
[refreshControl addTarget:self action:@selector(refresh:) forControlEvents:UIControlEventValueChanged];
}
- (void)getData
{
NSURL *blogURL = [NSURL URLWithString:JSON_URL];
NSData *jsonData = [NSData dataWithContentsOfURL:blogURL];
NSError *error = nil;
NSDictionary *dataDictionary = [NSJSONSerialization
JSONObjectWithData:jsonData options:0 error:&error];
for (NSDictionary *bpDictionary in dataDictionary) {
Object *currenHotel = [[Object alloc]Station:[bpDictionary objectForKey:@"station"] Status:[bpDictionary objectForKey:@"status"]];
[self.objectHolderArray addObject:currenHotel];
}
}
- (IBAction)refresh:(UIRefreshControl *)sender {
[self getData];
[self.tableView reloadData];
[sender endRefreshing];
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:
(NSInteger)section
{
return [self.objectHolderArray count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:
(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"Cell";
MartaViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier
forIndexPath:indexPath];
Object *currentHotel = [self.objectHolderArray
objectAtIndex:indexPath.row];
cell.lblStation.text = currentHotel.station;
cell.lblStatus.text = currentHotel.status;
return cell;
}
-(NSMutableArray *)objectHolderArray{
if(!_objectHolderArray) _objectHolderArray = [[NSMutableArray alloc]init];
return _objectHolderArray;
}
@end
在將新數據集追加到objectHolderArray之前,應通過調用[objectHolderArray removeAllObjects]方法從objectHolderArray中刪除所有舊對象。 –