检测可达性

Question

I have Reachability class that I adopted from Apple. My problem is implementing my reachability detection in my ListViewController rather than in the ReachabilityAppDelegate shown in Apple. My problems:

1. I want to link the calling method in the (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath and the reachability detection

2. I am trying to disable my cell if they detect it is not connected and enable the cell if it
   is connected

This is coded in viewDidLoad:

   [[NSNotificationCenter defaultCenter] addObserver: self selector:@selector(reachabilityChanged:) name:kReachabilityChangedNotification object: nil];

The reachabilityChanged as below:

-(void) reachabilityChanged: (NSNotification* )note{
  Reachability* curReach = [note object];
  NSParameterAssert([curReach isKindOfClass:[Reachability class]]);
  [self updateInterfaceWithReachability: curReach];
}

How do I implement my disabling of UITableViewCells in

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

• Take note that I have coded this in the above method:

   NSInteger row = [indexPath row]; NSString *contentForThisRow = nil; static NSString *MyIdentifier = @"MyIdentifier"; if (tableView == [[self searchDisplayController] searchResultsTableView]) { // Sort search results in alphabetical order NSArray *sorted = [searchResults sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)]; contentForThisRow = [sorted objectAtIndex:row]; }else { contentForThisRow = [nameArray objectAtIndex:row]; } UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:MyIdentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:MyIdentifier]autorelease]; } // Set Device names into Cells cell.textLabel.text = contentForThisRow; cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator; NSLog(@"Load cell done"); 

  }

Answer 1

you can code like this , add an instance var BOOL _isOffline in the class and in your updateInterfaceWithReachability: method

- (void)updateInterfaceWithReachability:(Reachability* )curReach
{
    if(curReach == XXXXNotReachable)
    {
        //your code
        _isOffline = YES;
    }
    else
    {
        _isOffline = NO;
    }
    [_tableView reloadData];
}

in your -(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

you should add your code to deal with the cell , may be

if(_isOffline)
{
    cell.userInteractionEnabled = NO;
}
else
{
    cell.userInteractionEnabled = YES;
}