ios - 附加您的 <bundle_ID> 目录。它是什么？

Question

我在为 iOS 7 的 Xcode 5 中将文件写入 AppSupport 文件夹时遇到问题。 我正在尝试做的事情:

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSApplicationSupportDirectory, NSUserDomainMask, YES);
NSString *plistPath = [[paths lastObject] stringByAppendingPathComponent:@“somedata.plist”];
if(plistData) {
    NSLog(@"PATH: %@", plistPath);
    BOOL success = [plistData writeToFile:plistPath atomically:YES];
    NSLog(@"SUCCESS: %hhd",success);
}
else {
    NSLog(@"ERROR CREATING PLIST: %@",error);
}

我得到的输出是 NO:

PATH: /var/mobile/Applications/40954....7E3C/Library/Application Support/somedata.plist
SUCCESS: 0

Apple 文档说:

Use the Application Support directory constant NSApplicationSupportDirectory, 
appending your <bundle_ID> for: …

附加您的 bundle_ID 是什么意思？可能有我应该使用的另一条路径吗？ NSDocumentDirectory 不适合我，因为它是用户文件的地方。

Answer 1

存储到 NSApplicationSupportDirectory 比这复杂一点，

关注这个Apple sample code将文件写入此目录，

- (NSURL*)applicationDirectory
{
    NSString* bundleID = [[NSBundle mainBundle] bundleIdentifier];
    NSFileManager*fm = [NSFileManager defaultManager];
    NSURL* dirPath = nil;

    // Find the application support directory in the home directory.
    NSArray* appSupportDir = [fm URLsForDirectory:NSApplicationSupportDirectory
                                        inDomains:NSUserDomainMask];
    if ([appSupportDir count] > 0)
    {
        // Append the bundle ID to the URL for the
        // Application Support directory
        dirPath = [[appSupportDir objectAtIndex:0] URLByAppendingPathComponent:bundleID];

        //Modified code to write your plist file to the Application support dir
        NSString *plistPath = [dirPath stringByAppendingPathComponent:@“somedata.plist”];

        //Assuming plistData is pre-populated ivar
        //Else add your code to create plistData here 
        if(plistData) {
            BOOL success = [plistData writeToFile:plistPath atomically:YES];
            NSLog(@"SUCCESS: %hhd",success);
        }
        else {
            NSLog(@"ERROR CREATING PLIST: %@",error);
        }
    }
}