如何清除tableviewcell中的数据再次开始重新加载？

Question

i'm developing a bluetooth apps.1) I want to hide a tableview when i start the apps..after i pressed a action button i want to enable a tableview.. 2)if i again press a action button means tableviewcell clear the data and show empty before searching..give me an idea..

some of the code-

- (IBAction)connectButtonTouched:(id)sender
{
[self.deviceTable reloadData];
self.connectButton.enabled = YES;
[self.deviceTable reloadData];
peripheralManager = [[PeripheralManager alloc] init];
peripheralManager.delegate = self;

[peripheralManager scanForPeripheralsAndConnect];
[self.deviceTable reloadData];
[NSTimer scheduledTimerWithTimeInterval:(float)5.0 target:self selector:@selector       (connectionTimer:) userInfo:nil repeats:YES];
alert=[[UIAlertView alloc] initWithTitle:@"Bluetooth" message:@"Scanning" delegate:nil    cancelButtonTitle:@"Cancel" otherButtonTitles:nil];
UIActivityIndicatorView *progress=[[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(125, 50, 30, 30)];
[alert addSubview:progress];
[progress startAnimating];
[alert show];
}

tableview

-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [device count];
}

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{

static NSString *CellIdentifier=@"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if(cell==nil)
{
cell =[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault  reuseIdentifier:CellIdentifier];

}
cell.textLabel.text=[device objectAtIndex:indexPath.row];
cell.accessoryType=UITableViewCellAccessoryDetailDisclosureButton;
return cell;
}

TableView Delegate

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell=[tableView cellForRowAtIndexPath:indexPath];

[self performSegueWithIdentifier:@"TableDetails" sender:tableView];
}

Answer 1

Add BOOL flag in .h file

Now in ViewDidLoad add this:

flag = FALSE;

in tableview delegate method

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
   if(flag)
     return [device count];
   else
     return 0;
}

In your button action method:

 - (IBAction)connectButtonTouched:(id)sender
 {
    if(!flag)
       flag = TRUE;
    else
       flag = FALSE;

    [self.deviceTable reloadData];
    //your other code here
 }

Answer 2

if they are in the same view, why not give the tableView a alpha of 0 and userInteractionEnabled = NO ?

Although, I think it would be easier if, instead of linking your tableView from interface builder, keep it as a member and initialize/reinitialize it when you tap your button.

something like: `- (IBAction)connectButtonTouched:(id)sender {

if (self.deviceTable) { [self.deviceTable removefromSuperview]; self.deviceTable = nil; }

self.deviceTable = [[UITableView alloc] init];

// and so on `

Also you might put another method in peripheralManager delegate ... something like -(void)didFinishScanning and inside redraw your table view.

I hope I understood the question well, and helped you in any way

Answer 3

1.If you want to hide table View before clicking a button you can use

tableView.hidden=YES; and inside

- (IBAction)connectButtonTouched:(id)sender , you can make it visible by using

tableView.hidden=NO;
[tableView reloadData]

OR

2.If you are developing app for iPad, then you can use UIPopOverController to show the data. You can load the tableView inside UIPopOverController when button is clicked.