从本地应用程序文件删除文件夹

Question

到目前为止，我已经成功地删除我的表视图行，但它不会在给定的文档文件夹更新。我将如何实现这一目标？以下是我正在使用的代码。

我试图从这里How to delete files from a folder which is placed in documents folder实现代码。

我的目标是要删除任何文件，而不仅仅是所需的文件的能力。

在此先感谢。

#import "Documents.h" 

@interface DocumentsViewController() 

@end 

@implementation DocumentsViewController 

- (id)initWithStyle:(UITableViewStyle)style 
{ 
    self = [super initWithStyle:style]; 
    if (self) { 
     // Custom initialization 
    } 
    return self; 
} 

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 

    // Uncomment the following line to preserve selection between presentations. 
    // self.clearsSelectionOnViewWillAppear = NO; 

    // Uncomment the following line to display an Edit button in the navigation bar for this view controller. 
    self.navigationItem.rightBarButtonItem = self.editButtonItem; 


    NSString *temp = [[NSBundle mainBundle] resourcePath]; 
    self.directoryPath = [temp stringByAppendingPathComponent:@"Documents"]; 

    [self.tableView setEditing:NO animated:YES]; 



} 


- (void)didReceiveMemoryWarning 
{ 
    [super didReceiveMemoryWarning]; 
    // Dispose of any resources that can be recreated. 
} 

#pragma mark - Table view data source 

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView 
{ 
    // Return the number of sections. 
    return 1; 
} 

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

     // Configure the cell. 
     cell.textLabel.text = [directoryContents objectAtIndex:indexPath.row]; 

     return cell; 
} 


-(NSString*)directoryPath{ 
    return directoryPath; 
} 

-(void)setDirectoryPath:(NSString*)a{ 
    [a retain]; 
    [directoryPath release]; 
    directoryPath = a; 
    [self loadDirectoryContents]; 
    [table reloadData]; 
} 

-(void)loadDirectoryContents{ 
    [directoryContents release]; 
    directoryContents = [[NSFileManager defaultManager] directoryContentsAtPath: directoryPath]; 
    [directoryContents retain]; 
} 

// Override to support conditional editing of the table view. 
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    // Return NO if you do not want the specified item to be editable. 
    return YES; 
} 


- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath { //implement the delegate method 

    if (editingStyle == UITableViewCellEditingStyleDelete) { 
     // Update data source array here, something like [array removeObjectAtIndex:indexPath.row]; 
     [directoryContents removeObjectAtIndex:indexPath.row]; 
     [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade]; 
     [tableView reloadData]; 


     NSString *extension = @"png"; 
     NSFileManager *fileManager = [NSFileManager defaultManager]; 
     NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,  NSUserDomainMask, YES); 
     NSString *documentsDirectory = [paths objectAtIndex:0]; 

     NSArray *contents = [fileManager contentsOfDirectoryAtPath:documentsDirectory error:NULL]; 
     NSEnumerator *e = [contents objectEnumerator]; 
     NSString *filename; 
     while ((filename = [e nextObject])) { 

      if ([[filename pathExtension] isEqualToString:extension]) { 

       [fileManager removeItemAtPath:[documentsDirectory  stringByAppendingPathComponent:filename] error:NULL]; 
      } 
     } 

    } 
} 


#pragma mark - Table view delegate 

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    // Navigation logic may go here. Create and push another view controller. 
    /* 
    <#DetailViewController#> *detailViewController = [[<#DetailViewController#> alloc] initWithNibName:@"<#Nib name#>" bundle:nil]; 
    // ... 
    // Pass the selected object to the new view controller. 
    [self.navigationController pushViewController:detailViewController animated:YES]; 
    */ 
} 

-(void)dealloc{ 
    [super dealloc];  
    [directoryContents release]; 
    directoryContents = nil; 
    self.directoryPath = nil; 
    [table release]; 
    table = nil; 

} 

@end 

工作的代码对我来说：

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath{ 
    if (editingStyle == UITableViewCellEditingStyleDelete){ 

     NSString *fileName = [directoryContents objectAtIndex:indexPath.row]; 

     NSString *path; 
     NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
     path = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"downloads"]; 
     path = [path stringByAppendingPathComponent:fileName]; 
     NSError *error; 

    //Remove cell 
     [directoryContents removeObjectAtIndex:indexPath.row]; 
     [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationLeft]; 
     [tableView reloadData]; 

     if ([[NSFileManager defaultManager] fileExistsAtPath:path])  //Does file exist? 
     { 
      if (![[NSFileManager defaultManager] removeItemAtPath:path error:&error]) //Delete it 
      { 
       NSLog(@"Delete file error: %@", error); 
      } 
     } 
    } 
} 

Answer 1

NSFileManager是在删除文件非常有用：

[[NSFileManager defaultManager] removeItemAtPath: pathToFile error: &error]; 

也看看这篇文章有一些有用的代码。虽然有点老，但代码工作得很好。

http://iphonedevsdk.com/forum/iphone-sdk-development/3576-how-do-i-delete-a-file-in-my-documents-directory.html

下面是一些代码示例

// Get the Documents directory path 
NSString *temPath = [NSString stringWithFormat:@"%@%d",@"Documents/Media_", Key_mediaID]; 
//This temPath look line ../../../Documents/Media_1 

    NSString *documentsDirectoryPath = [NSHomeDirectory() stringByAppendingPathComponent:temPath]; 

// Delete the file using NSFileManager 
NSFileManager *fileManager = [NSFileManager defaultManager]; 
[fileManager removeItemAtPath:[documentsDirectoryPath stringByAppendingPathComponent:Your File Name] error:nil]; 

下面是一些有用的代码

http://ios.biomsoft.com/2012/01/17/delete-all-files-in-documents-directory/

希望另一个链接这可以帮助你。

编辑：

要删除具有特定扩展名的文件中说，例如JPG，你可以试试下面的

NSString *extension = @"jpg"; 
    NSFileManager *fileManager = [NSFileManager defaultManager]; 
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,  NSUserDomainMask, YES); 
    NSString *documentsDirectory = [paths objectAtIndex:0]; 

    NSArray *contents = [fileManager contentsOfDirectoryAtPath:documentsDirectory error:NULL]; 
    NSEnumerator *e = [contents objectEnumerator]; 
    NSString *filename; 
    while ((filename = [e nextObject])) { 

    if ([[filename pathExtension] isEqualToString:extension]) { 

    [fileManager removeItemAtPath:[documentsDirectory  stringByAppendingPathComponent:filename] error:NULL]; 
    } 
    } 

除了上面的，如果你知道路径到你想要的文件删除以下是一个有用的代码：

// Get the Documents directory path 
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
NSString *documentsDirectoryPath = [paths objectAtIndex:0]; 

// Delete the file using NSFileManager 
NSFileManager *fileManager = [NSFileManager defaultManager]; 
[fileManager removeItemAtPath:[documentsDirectoryPath stringByAppendingPathComponent:yourFile.txt] error:nil]; 

编辑2：

要删除文档中的特定文件夹：

NSError *error; 
NSFileManager *fileMgr = [NSFileManager defaultManager]; 
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
NSString *documentsDirectory = [paths objectAtIndex:0]; 
NSString *documents= [documentsDirectory stringByAppendingPathComponent:@"YourFolder"]; 
NSString *filePath = [documents stringByAppendingPathComponent:@"file2.txt"]; 
[fileMgr removeItemAtPath:filePath error:&error]