Question

ios开发怎么从沙盒中取出大量的数据而不卡

Answer 1

从沙盒中取数据是需要异步处理的，跟从数据库和后台接口取数据一样。必须采用异步处理，不能直接在主线程中取数据。例如下面的沙盒操作。

[self showProgressWithView:self.view animated:YES];

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{

NSString *docDirPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];

NSString *path = [self libCachePath];

// NSString *filePath = [NSString stringWithFormat:@"%@/%@.zip", docDirPath , [name stringFromMD5]];

NSFileManager* fileManager=[NSFileManager defaultManager];

/**删除zip文件*/

NSDirectoryEnumerator *enumerator = [[NSFileManager defaultManager] enumeratorAtPath:docDirPath];

for (NSString *fileName in enumerator) {

[[NSFileManager defaultManager] removeItemAtPath:[docDirPath stringByAppendingPathComponent:fileName] error:nil];

}

[fileManager removeItemAtPath:path error:nil];

[DBDaoHelper createAllTable];

dispatch_async(dispatch_get_main_queue(), ^{

[self hideProgress:self.view animated:YES];

});