Question

我在Xcode 5中为iOS 7编写文件到AppSupport文件夹时遇到了问题。我想做什么：

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);
}

我输出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: …

什么意思附加你的bundle_ID？可能还有另一条路我应该用？ NSDocumentDirectory不适合我，因为它是用户文件的地方。

Answer 1

存储到NSApplicationSupportDirectory比这更复杂，

按照此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);
        }
    }
}

附加<bundle_id>目录。它是什么？</bundle_id>

1 个答案: