因此，您要删除所有 *。sqlite 文件？没有办法避免循环，但您可以通过使用 NSPredicate 首先过滤掉非sql文件并使用快速枚举确保快速性能来限制它。这里有一个方法：

So, you'd like to delete all *.sqlite files? There is no way to avoid looping, but you can limit it by using a NSPredicate to filter out non-sql files first and ensure speedy performance using fast enumeration. Here's a method to do it:

- (void)removeAllSQLiteFiles    
{
    NSFileManager  *manager = [NSFileManager defaultManager];

    // the preferred way to get the apps documents directory
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];

    // grab all the files in the documents dir
    NSArray *allFiles = [manager contentsOfDirectoryAtPath:documentsDirectory error:nil];

    // filter the array for only sqlite files
    NSPredicate *fltr = [NSPredicate predicateWithFormat:@"self ENDSWITH '.sqlite'"];
    NSArray *sqliteFiles = [allFiles filteredArrayUsingPredicate:fltr];

    // use fast enumeration to iterate the array and delete the files
    for (NSString *sqliteFile in sqliteFiles)
    {
       NSError *error = nil;
       [manager removeItemAtPath:[documentsDirectory stringByAppendingPathComponent:sqliteFile] error:&error];
       NSAssert(!error, @"Assertion: SQLite file deletion shall never throw an error.");
    }
}