在Cocoa中重命名文件?

时间:2009-05-16 23:23:05

标签: objective-c cocoa nsfilemanager file-management

如何重命名文件,将文件保存在同一目录中?

我有一个包含文件完整路径的字符串,以及一个包含新文件名(没有路径)的字符串,例如:

NSString *old_filepath = @"/Volumes/blah/myfilewithrubbishname.avi";
NSString *new_filename = @"My Correctly Named File.avi";

我知道NSFileManager的movePath:toPath:handler:方法,但我无法研究如何构建新文件的路径..

基本上我正在寻找与以下Python代码等价的东西:

>>> import os
>>> old_filepath = "/Volumes/blah/myfilewithrubbishname.avi"
>>> new_filename = "My Correctly Named File.avi"
>>> dirname = os.path.split(old_filepath)[0]
>>> new_filepath = os.path.join(dirname, new_filename)
>>> print new_filepath
/Volumes/blah/My Correctly Named File.avi
>>> os.rename(old_filepath, new_filepath)

5 个答案:

答案 0 :(得分:36)

NSFileManager和NSWorkspace都有文件操作方法,但NSFileManager的- (BOOL)movePath:(NSString *)source toPath:(NSString *)destination handler:(id)handler可能是你最好的选择。使用NSString的路径操作方法来获取正确的文件和文件夹名称。例如,

NSString *newPath = [[oldPath stringByDeletingLastPathComponent] stringByAppendingPathComponent:newFilename];
[[NSFileManager defaultManager] movePath:oldPath toPath:newPath handler:nil];

这两个课程在文档中都有很好的解释,但是如果有任何你不理解的话,请留言。

答案 1 :(得分:14)

值得注意的是,将文件移动到自身会失败。我有一个方法用下划线替换空格,并使文件名小写,并将文件重命名为新名称。名称中只有一个单词的文件将无法重命名,因为新名称在不区分大小写的文件系统上是相同的。

我解决这个问题的方法是进行两步重命名,首先将文件重命名为临时名称,然后将其重命名为预期名称。

一些伪代码解释了这一点:

NSString *source = @"/FILE.txt";
NSString *newName = [[source lastPathComponent] lowercaseString];
NSString *target = [[oldPath stringByDeletingLastPathComponent] stringByAppendingPathComponent:newName];

[[NSFileManager defaultManager] movePath:source toPath:target error:nil]; // <-- FAILS

解决方案:

NSString *source = @"/FILE.txt";
NSString *newName = [[source lastPathComponent] lowercaseString];

NSString *temp = [[oldPath stringByDeletingLastPathComponent] stringByAppendingPathComponent:[NSString stringWithFormat:@"%@-temp", newName]];
NSString *target = [[oldPath stringByDeletingLastPathComponent] stringByAppendingPathComponent:newName];

[[NSFileManager defaultManager] movePath:source toPath:temp error:nil];
[[NSFileManager defaultManager] movePath:temp toPath:target error:nil];

答案 2 :(得分:8)

我只是想让新手更容易理解。这是所有代码:

    NSString *oldPath = @"/Users/brock/Desktop/OriginalFile.png";
NSString *newFilename = @"NewFileName.png";

NSString *newPath = [[oldPath stringByDeletingLastPathComponent] stringByAppendingPathComponent:newFilename];
[[NSFileManager defaultManager] movePath:oldPath toPath:newPath handler:nil];

NSLog( @"File renamed to %@", newFilename );

答案 3 :(得分:4)

这是iOS最近的一个例子,NSFileManager方法有点不同:

NSString *newFilename = [NSString stringWithFormat:@"%@.m4a", newRecording.title];

NSString *newPath = [[newRecording.localPath stringByDeletingLastPathComponent] stringByAppendingPathComponent:newFilename];
[[NSFileManager defaultManager] moveItemAtPath:newRecording.localPath toPath:newPath error:nil];

答案 4 :(得分:0)

对于锦上添花,NSFileManager上的类别:

@implementation NSFileManager (FileManipulations)


- (void)changeFileNamesInDirectory:(NSString *)directory changeBlock:(NSString * (^) (NSString *fileName))block
{
    NSString *inputDirectory = directory;

    NSFileManager *fileManager = [NSFileManager new];

    NSArray *fileNames = [fileManager contentsOfDirectoryAtPath:inputDirectory error:nil];
    for (NSString *fileName in fileNames) {

        NSString *newFileName =  block(fileName);

        NSString *oldPath = [NSString stringWithFormat:@"%@/%@", inputDirectory, oldFileName];
        // move to temp path so case changes can happen
        NSString *tempPath = [NSString stringWithFormat:@"%@-tempName", oldPath];
        NSString *newPath = [[oldPath stringByDeletingLastPathComponent] stringByAppendingPathComponent:newFileName];

        NSError *error = nil;
        [fileManager moveItemAtPath:oldPath toPath:tempPath error:&error];
        if (error) {
            NSLog(@"%@", [error localizedDescription]);
            return;
        }
        [fileManager moveItemAtPath:tempPath toPath:newPath error:&error];
        if (error) {
            NSLog(@"%@", [error localizedDescription]);
        }
    }
}


@end