我将一些下载的文件存储在 NSDocumentDirectory 中,我需要将这些文件标记为“不备份”。
这是我给出的代码
- (BOOL)addSkipBackupAttributeToItemAtURL:(NSURL *)URL1
{
if (&NSURLIsExcludedFromBackupKey == nil) { // iOS <= 5.0.1
const char* filePath = [[URL1 path] fileSystemRepresentation];
const char* attrName = "com.apple.MobileBackup";
u_int8_t attrValue = 1;
int result = setxattr(filePath, attrName, &attrValue, sizeof(attrValue), 0, 0);
return result == 0;
} else { // iOS >= 5.1
NSError *error = nil;
[URL1 setResourceValue:[NSNumber numberWithBool:YES] forKey:NSURLIsExcludedFromBackupKey error:&error];
return error == nil;
NSLog(@"success");
}
}
对应该为该方法提供哪个 url 有点困惑?下载 url 还是下载的文件路径 url?我可以像这样使用吗
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectoryPath = [[paths objectAtIndex:0]stringByAppendingPathComponent:@"MdMus.mp3"];
[receivedData writeToFile:documentsDirectoryPath atomically:YES];
需要用这个
NSURL *url=[NSURL fileURLWithPath:documentsDirectoryPath];
[self addSkipBackupAttributeToItemAtURL:url];
或这个
[self addSkipBackupAttributeToItemAtURL:DownloadingURL];
需要帮忙