Grand Central Dispatch(GCD)を使用して、メソッドを非同期的にスレッドで実行します
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
// user disk space - will use user document
NSString *docuemntPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
// app bundle folder
NSString *bundleRoot = [[NSBundle mainBundle] resourcePath];
NSString *folderPath = [bundleRoot stringByAppendingPathComponent:@"aFolder"];
NSArray *files = [[NSFileManager defaultManager] enumeratorAtPath:folderPath].allObjects;
for (NSString *aFile in [files objectEnumerator]) {
NSString *copyPath = [folderPath stringByAppendingPathComponent:aFile];
NSString *destPath = [docuemntPath stringByAppendingPathComponent:aFile];
NSError *error;
if ([[NSFileManager defaultManager] copyItemAtPath:copyPath toPath:destPath error:&error]) {
NSLog(@"Copying successful");
// here add a percent to progress view
} else {
NSLog(@"Copying error: %@", error.userInfo);
}
}
// When the copying is finished update your UI
// on the main thread and do what ever you need with the object
dispatch_async(dispatch_get_main_queue(), ^{
[self someMethod:myData];
});
});
メインスレッドで UIProgressView を使用して、ファイル/フォルダーの数からファイル操作の進行状況を示します。