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POObjective-C: How to refresh a UITableView?
 

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  1. POObjective-C: How to refresh a UITableView?
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    <p>I have some code that displays file name in my <code>uitableview</code>. however once deleting a file and refreshing i receive an error. Here is my code to display my file name, my delete button actions and the error:</p> <p><strong>Firstly when a button is pressed i run this code which works when adding a file to the table:</strong></p> <pre><code>-(IBAction)refresh{ [[self mytable] reloadData]; } </code></pre> <p><strong>Secondly I have this code to get and display the values the table is going to display. This works fine until the deletion and update occurs:</strong></p> <pre><code>- (void)viewDidLoad { [super viewDidLoad]; NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; filePathsArray = [[[NSFileManager defaultManager] subpathsOfDirectoryAtPath:documentsDirectory error:nil]mutableCopy]; mytable.dataSource = self; mytable.delegate = self; } </code></pre> <p>-</p> <pre><code>-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{ if(!filePathsArray) { return 0; } if ([filePathsArray count] &gt; 0) return [filePathsArray count]; else return 0; } </code></pre> <p>-</p> <pre><code>- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath { if (editingStyle == UITableViewCellEditingStyleDelete) { //add code here for when you hit delete NSString *currentFileName = filePathsArray[indexPath.row]; NSString *documentsDirectoryPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask,YES) objectAtIndex:0]; NSString *filePath = [documentsDirectoryPath stringByAppendingPathComponent:currentFileName]; fileURL = [NSURL fileURLWithPath:filePath]; NSLog(@"urlstring %@",fileURL); NSFileManager *fileManager = [NSFileManager defaultManager]; [fileManager removeItemAtPath:filePath error:NULL]; NSLog(@"successfully deleted"); } } </code></pre> <p>-</p> <pre><code>-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{ UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"MainCell"]; if (cell == nil) { cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"MainCell"]; } NSLog(@"urlstring %@",[filePathsArray objectAtIndex:indexPath.row]); NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; filePathsArray = [[NSFileManager defaultManager] subpathsOfDirectoryAtPath:documentsDirectory error:nil]; cell.textLabel.text = [filePathsArray[indexPath.row] lastPathComponent]; filePathsArray = [[NSArray alloc] initWithArray: [[[NSFileManager defaultManager] subpathsOfDirectoryAtPath:documentsDirectory error:nil]mutableCopy]]; return cell; } </code></pre> <p>-</p> <pre><code>-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{ return 1; } </code></pre> <p><strong>The error i receive is this:</strong></p> <pre><code> *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayI objectAtIndex:]: index 6 beyond bounds [0 .. 5]' *** First throw call stack: (0x2049012 0x1473e7e 0x1ffeb44 0x3c3a 0x69b8fb 0x69b9cf 0x6841bb 0x694b4b 0x6312dd 0x14876b0 0x2c84fc0 0x2c7933c 0x2c79150 0x2bf70bc 0x2bf8227 0x2bf88e2 0x2011afe 0x2011a3d 0x1fef7c2 0x1feef44 0x1feee1b 0x23dc7e3 0x23dc668 0x5e0ffc 0x2212 0x2145) libc++abi.dylib: terminate called throwing an exception (lldb) </code></pre> <p>I receive this error due to:</p> <pre><code>NSLog(@"urlstring %@",[filePathsArray objectAtIndex:indexPath.row]); </code></pre> <p>but once removed it says the problem is with the next line. Can anybody help?</p>
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    1. USuser2569812
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    1. COI love the implementation of `numberOfRowsInSection:`. Instead of `return filePathsArray.count;`, you are making two superfluous and redundant checks (resulting in 3 unnecessary paths of execution) which don't protect you from anything, only decrease readability and confuse whoever tries to dig through the code.
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    2. CO@H2CO3 I "love" how you manage to turn sensible advice into depreciatory comments.
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    3. CO@herzbube I love that too. It's a special power.
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