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當用戶第一次使用我的應用程序時，它應該將配置文件從軟件包複製到某個文件夾中。然後用戶可以擺弄這個文件，如果他們搞砸了，他們可以簡單地按'恢復'，這將刪除該文件並再次從該文件夾中複製。iOS：在應用程序啓動時從軟件包複製文件
- (void) resetPresets
{
LOG_(@"Copying tunings file from original...");
// copy default tunings -> curr tunings file
NSString* appSupportDir = [NSFileManager appSupportDir];
NSString* tuningsPath = [appSupportDir stringByAppendingPathComponent: @"tunings.txt"];
NSBundle* bundle = [NSBundle mainBundle];
NSString* origTuningsPath = [bundle pathForResource: @"tuningsOriginal"
ofType: @"txt" ];
NSFileManager* fileManager = [NSFileManager defaultManager];
NSError* error = nil;
if([fileManager fileExistsAtPath: tuningsPath])
{
[fileManager removeItemAtPath: tuningsPath
error: & error ];
if(error)
LOG(@"\n ERROR: %@ \n %@ \n", [error userInfo], [error localizedFailureReason]);
}
assert([fileManager fileExistsAtPath: origTuningsPath]);
[fileManager copyItemAtPath: origTuningsPath
toPath: tuningsPath
error: & error ];
if(error)
LOG(@"\n ERROR: %@ \n %@ \n", [error userInfo], [error localizedFailureReason]);
LOG(@"done!");
// load profiles from it
[self loadProfilesFromFile: tuningsPath ];
// auto-sets active preset index to 0 & saves prefs
self.activeThemeIndex = 0;
}
依賴於一個簡單分類：
#import "NSFileManager+addons.h"
@implementation NSFileManager (NSFileManager_addons)
+ (NSString *) appSupportDir
{
NSArray* paths = NSSearchPathForDirectoriesInDomains(
NSApplicationSupportDirectory,
NSUserDomainMask,
YES
);
NSString* appSupportDir = [paths objectAtIndex: 0];
return appSupportDir;
}
@end
這是導致問題的行：
[fileManager copyItemAtPath: origTuningsPath
toPath: tuningsPath
error: & error ];
，這是控制檯輸出：
[presets init] Presets -> first run! Setting up with default presets Copying tunings file from original... ERROR: { NSDestinationFilePath = "/var/mobile/Applications/38FC3C65-74AF-4892-B48D-A3508A8CF404/Library/Application Support/tunings.txt"; NSFilePath = "/var/mobile/Applications/38FC3C65-74AF-4892-B48D-A3508A8CF404/Fork.app/tuningsOriginal.txt"; NSUserStringVariant = Copy; } No such file or directory
爲什麼它抱怨沒有蘇ch文件或目錄？顯然，不應該有這樣的文件存在。當你將一個文件複製到一個新的位置時，你不希望有一個文件在那裏。
所以我想它是抱怨目錄。但我使用相當標準的方法將目錄撈出。到底是怎麼回事？這不是正確的目錄嗎？還是我在做其他事情？