附加您的<bundle_ID>目錄。它是什麼？

Question

我在與在Xcode 5書面文件AppSupport文件夾，爲iOS 7的麻煩 我想要做的事：

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); 
} 

而且我沒有得到作爲輸出：

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

蘋果的文件說：

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

什麼意思你追加bundle_ID的？可能還有另一條路要我用？ NSDocumentDirectory不適合我，因爲它是用戶文件的一個地方。

Answer 1

存儲到NSApplicationSupportDirectory是有點複雜多了，

按照此Apple sample code將文件寫入到這個目錄，

- (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); 
     } 
    } 
}