以编程方式获取应用程序支持文件夹的路径

Question

我正在尝试为用户的应用程序支持文件夹获取 NSString。

我知道我可以做到NSString *path = @"~/Library/Application Support";，但这似乎不太优雅。我已经尝试过使用NSSearchPathForDirectoriesInDomains，但它似乎很冗长，并创建了几个不必要的对象（至少，我的实现是这样）。

有没有简单的方法来做到这一点？

Answer 1

这已经过时了，对于当前的最佳实践，请使用FileManager.default.urls(for:in:)，如下面@andyvn22 的评论中所示。

最佳做法是使用 NSSearchPathForDirectoriesInDomains 和 NSApplicationSupportDirectory 尽可能“啰嗦”。

例子：

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSApplicationSupportDirectory, NSUserDomainMask, YES);
NSString *applicationSupportDirectory = [paths firstObject];
NSLog(@"applicationSupportDirectory: '%@'", applicationSupportDirectory);

NSLog 输出：

applicationSupportDirectory: '/Volumes/User/me/Library/Application Support'

Answer 2

斯威夫特：

print(NSHomeDirectory())

或

print(FileManager.default.urls(for: .applicationSupportDirectory, in: .userDomainMask).first)

和

let yourString = String(FileManager.default.urls(for: .applicationSupportDirectory, in: .userDomainMask).first)

Answer 3

斯威夫特 3：

FileManager.default.urls(for: .applicationSupportDirectory, in: .userDomainMask).first

Answer 4

只是为了确保人们会开始使用推荐的方法：

- (NSArray<NSURL *> * _Nonnull)URLsForDirectory:(NSSearchPathDirectory)directory
                                      inDomains:(NSSearchPathDomainMask)domainMask

文档中的扩展示例：

- (NSURL*)applicationDataDirectory {
    NSFileManager* sharedFM = [NSFileManager defaultManager];
    NSArray* possibleURLs = [sharedFM URLsForDirectory:NSApplicationSupportDirectory
                                 inDomains:NSUserDomainMask];
    NSURL* appSupportDir = nil;
    NSURL* appDirectory = nil;

    if ([possibleURLs count] >= 1) {
        // Use the first directory (if multiple are returned)
        appSupportDir = [possibleURLs objectAtIndex:0];
    }

    // If a valid app support directory exists, add the
    // app's bundle ID to it to specify the final directory.
    if (appSupportDir) {
        NSString* appBundleID = [[NSBundle mainBundle] bundleIdentifier];
        appDirectory = [appSupportDir URLByAppendingPathComponent:appBundleID];
    }

    return appDirectory;
}

证明链接：https://developer.apple.com/library/ios/documentation/FileManagement/Conceptual/FileSystemProgrammingGuide/AccessingFilesandDirectories/AccessingFilesandDirectories.html#//apple_ref/doc/uid/TP40010672-CH3-SW3

Answer 5

这对我有用：

NSError *error;
NSURL* appSupportDir = [[NSFileManager defaultManager]     
         URLForDirectory:NSApplicationSupportDirectory
                inDomain:NSUserDomainMask
       appropriateForURL:nil
                  create:YES
                   error:&error];

Answer 6

这是我用来获取数据库的。从斯坦福课堂上得到它。它可能对某人有所帮助。

NSURL *url = [[[NSFileManager URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject];
url = [url URLByAppendingPathComponent:@"database_name"];
NSLog(@"Database URL: %@",url);

Answer 7

创建单独的目标 C 类用于读取和写入文档目录。我会避免代码重写。以下是我的版本。

//Directory.h
#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>

#define PATH (NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES))
#define BASEPATH (([PATH count] > 0)? [PATH objectAtIndex:0] : nil)

@interface DocumentsDirectory : NSObject

//Here you can also use URL path as return type and file path.
+(void)removeFilesfromDocumentsDirectory:(NSString*)filename;
+(NSString*)writeFiletoDocumentsDirectory:(NSString*)filename;
@end


#import "Directory.h"

@implementation DocumentsDirectory

UIAlertView *updateAlert;

+(void)removeFilesfromDocumentsDirectory:(NSString*)filename
{
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSString *filePath = [BASEPATH stringByAppendingPathComponent:filename];

    NSError *error;
    BOOL success = [fileManager removeItemAtPath:filePath error:&error]; //Remove or delete file from documents directory.

    if (success)
    {
        updateAlert= [[UIAlertView alloc] initWithTitle:@"Congratulations:" message:@"File is updated successfully" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [updateAlert show];
    }
    else
    {
        NSLog(@"Could not delete file -:%@ ",[error localizedDescription]);
        updateAlert= [[UIAlertView alloc] initWithTitle:@"Try again:" message:[error localizedDescription] delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [updateAlert show];
    }
}

+(NSString*)writeFiletoDocumentsDirectory:(NSString*)filename
{
    NSString *foldDestination = BASEPATH;
    NSString *filePath = [foldDestination stringByAppendingPathComponent:filename];

    return filePath;
}

@end