iphone：从文档目录文件夹复制或移动文件

这是我的密码

NSArray *pathSong = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *toPath = [[pathSong objectAtIndex:0] stringByAppendingPathComponent:@"Songs"];
    NSString *fromPath=[[pathSong objectAtIndex:0] stringByAppendingPathComponent:@"abc"];
    NSString *strdestination = [fromPath stringByAppendingPathComponent:@"sg.mp3"];
    NSError *Error;
    if([[NSFileManager defaultManager]fileExistsAtPath:strdestination]){
        if([[NSFileManager defaultManager]copyItemAtPath:strdestination toPath:toPath error:&Error]==NO){
            UIAlertView *Alert=[[UIAlertView alloc]initWithTitle:@"copy" message:[NSString stringWithFormat:@"%@",Error] delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
            [Alert show];
        }
        else{
            UIAlertView *Alert=[[UIAlertView alloc]initWithTitle:@"Not copy" message:[NSString stringWithFormat:@"%@",Error] delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
            [Alert show];
        }
    }

我得到了错误标志：

错误域=NSCOCAERRORDOMINCODE=516“无法执行该操作 已完成。（箭头516。）“用户信息=0x681abf0

NSUnderlyingError=0x681b920“该操作无法完成 .文件存在“

---

abc文件夹没有歌曲名“sg.mp3”，但我仍然得到文件存在错误。我不知道我哪里出错了？

我想这是因为你试图用你的副本覆盖一个文件

检查您的权限掩码，尝试使用缓存而不是documents目录

---

您的意思是

如果（！fileExistsAtPath）

您需要删除已经存在的文件：

NSArray *pathSong = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *toPath = [[pathSong objectAtIndex:0] stringByAppendingPathComponent:@"Songs"];
NSString *fromPath=[[pathSong objectAtIndex:0] stringByAppendingPathComponent:@"abc"];
NSString *strdestination = [fromPath stringByAppendingPathComponent:@"sg.mp3"];
NSError *Error;


//DELETE THE FILE AT THE LOCATION YOU'RE COPYING TO
NSFileManager *fileManager = [NSFileManager defaultManager];
[fileManager removeItemAtPath:strdestination error:NULL];


if([[NSFileManager defaultManager]copyItemAtPath:strdestination toPath:toPath error:&Error]==NO){
        UIAlertView *Alert=[[UIAlertView alloc]initWithTitle:@"copy" message:[NSString stringWithFormat:@"%@",Error] delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
        [Alert show];
    }
else{
        UIAlertView *Alert=[[UIAlertView alloc]initWithTitle:@"Not copy" message:[NSString stringWithFormat:@"%@",Error] delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
        [Alert show];
    }

---

代码中有两个问题：

如果文件已经存在，则需要删除该文件

您需要为目标文件指定一个名称，这意味着如果您使用类似的名称：

NSString*toPath=[[pathSong objectAtIndex:0]stringByAppendingPathComponent:@“歌曲”]

及

然后，如果复制发生，它会将Sg.mp3文件复制为不带任何类型的歌曲

所以你需要这样写：

NSArray *pathSong = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *tempPath = [[pathSong objectAtIndex:0] stringByAppendingPathComponent:@"Songs"];
NSString *toPath = [tempPath stringByAppendingPathComponent:@"yourFileName.mp3"];
NSString *fromPath = [[pathSong objectAtIndex:0] stringByAppendingPathComponent:@"abc"];
NSString *strdestination = [fromPath stringByAppendingPathComponent:@"sg.mp3"];
NSError *Error = nil;

if([[NSFileManager defaultManager]fileExistsAtPath:strdestination])
{

  if([[NSFileManager defaultManager]copyItemAtPath:strdestination toPath:toPath error:&Error]==NO)
   {
       UIAlertView *Alert=[[UIAlertView alloc]initWithTitle:@"copy" message:[NSString stringWithFormat:@"%@",Error] delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
       [Alert show];
   }
   else
   {
      [fileManager removeItemAtPath:strdestination error:NULL];
       UIAlertView *Alert=[[UIAlertView alloc]initWithTitle:@"Not copy" message:[NSString stringWithFormat:@"%@",Error] delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
       [Alert show];
   }
}

此代码将删除目标中存在的文件，然后将
sg.mp3
从
abc
文件夹复制到名为
yourFileName.mp3
的
Songs
文件夹，根据Midhun MP答案绘制，这里有一个帮助

BOOL moveFile(NSString *srcPath, NSString *dstPath)
{
    NSLog(@"moving %@ -> %@", srcPath, dstPath);

    NSFileManager *fm = [NSFileManager defaultManager];
    if ([fm fileExistsAtPath:dstPath])
    {
        // in my usecase this is a hard error, bolt to prevent overwriting
        return NO;
    }

    if ([fm fileExistsAtPath:srcPath])
    {
        NSError *error = nil;
        NSString *destDir = [dstPath stringByDeletingLastPathComponent];
        [fm createDirectoryAtPath:destDir withIntermediateDirectories:YES attributes:nil error:nil];

        if ([[NSFileManager defaultManager] copyItemAtPath:srcPath toPath:dstPath error:&error]==NO)
        {
            NSLog(@"failure declassing %@", srcPath);
            return NO;
        }
        else
        {
            [fm removeItemAtPath:srcPath error:NULL]; // gr8t success
            return YES;
        }
    }

    return NO;
 }

你能在你的有问题的代码上设置代码标签吗？你正试图复制一个文件而不是另一个文件？@FaddishWorm:我想将一个文件复制到另一个文件夹。@Jonathan Plackett:如果你在复制之前删除源文件，它将显示一个错误：没有这样的文件，错误代码260必须在开始复制之前手动创建目录。。下面给出的答案中提到了代码。
BOOL moveFile(NSString *srcPath, NSString *dstPath)
{
    NSLog(@"moving %@ -> %@", srcPath, dstPath);

    NSFileManager *fm = [NSFileManager defaultManager];
    if ([fm fileExistsAtPath:dstPath])
    {
        // in my usecase this is a hard error, bolt to prevent overwriting
        return NO;
    }

    if ([fm fileExistsAtPath:srcPath])
    {
        NSError *error = nil;
        NSString *destDir = [dstPath stringByDeletingLastPathComponent];
        [fm createDirectoryAtPath:destDir withIntermediateDirectories:YES attributes:nil error:nil];

        if ([[NSFileManager defaultManager] copyItemAtPath:srcPath toPath:dstPath error:&error]==NO)
        {
            NSLog(@"failure declassing %@", srcPath);
            return NO;
        }
        else
        {
            [fm removeItemAtPath:srcPath error:NULL]; // gr8t success
            return YES;
        }
    }

    return NO;
 }