在应用启动时获取捆绑文件引用/路径 [英] Getting bundle file references / paths at app launch

问题描述

假设主应用程序包中包含任意一组文件。我想获取启动时的文件URL并将它们存储在某处。这是否可以使用 NSFileManager ？在这方面文档不清楚。

注意：我只需要文件URL，我不需要访问实际文件。

使用

  NSString * path = [[NSBundle mainBundle] pathForResource：@SomeFileofType：@jpeg]; 
 NSURL * url = [NSURL fileURLWithPath：path]; 
  

您可以将此URL写入例如Documents目录中的属性列表文件：

  NSString * docsDir = [NSSearchForDirectoriesInDomains（NSDocumentsDirectory，NSUserDomainMask，YES）objectAtIndex：0]; 
 NSString * plistPath = [docsDir stringByAppendingPathComponent：@Files.plist]; 
 NSDictionary * dict = [NSDictionary dictionaryWithObjectsAndKeys：[url absoluteString] forKey：@SomeFile.jpeg]; 
 [dict writeToFile：plistPath atomically：YES]; 
  

如果你不知道文件的名称，你只想列出所有文件捆绑包，使用

  NSArray * files = [[NSFileManager defaultManager] contentsOfDirectoryAtPath：[[NSBundle mainBundle] bundlePath] error：NULL] ; 
 for（文件中的NSString * fileName）{
 NSString * path = [[NSBundle mainBundle] pathForResource：fileName ofType：nil]; 
 NSURL * url = [NSURL fileURLWithPath：path]; 
 //用'url`做一些事情
} 
  

Suppose I have an arbitrary set of files included in the Main App Bundle. I would like to fetch the file URLs for those at launch and store them somewhere. Is this possible using NSFileManager? The documentation is unclear in that regard.

Note: I only need the file URLs, I do not need to access the actual files.

解决方案

You can get the URL of a file in the main bundle using

NSString *path = [[NSBundle mainBundle] pathForResource:@"SomeFile" ofType:@"jpeg"];
NSURL *url = [NSURL fileURLWithPath:path];

You can write this URL to, for example, a property list file in the Documents directory:

NSString *docsDir = [NSSearchForDirectoriesInDomains(NSDocumentsDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *plistPath = [docsDir stringByAppendingPathComponent:@"Files.plist"];
NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:[url absoluteString] forKey:@"SomeFile.jpeg"];
[dict writeToFile:plistPath atomically:YES];

If you don't know the names of the files and you just want to list all the files in the bundle, use

NSArray *files = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:[[NSBundle mainBundle] bundlePath] error:NULL];
for (NSString *fileName in files) {
    NSString *path = [[NSBundle mainBundle] pathForResource:fileName ofType:nil];
    NSURL *url = [NSURL fileURLWithPath:path];
    // do something with `url`
}

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