ios-objectiveC中怎麼獲得所有的可用編碼？

objectiveC中怎麼獲得所有的可用編碼？

在Java中可以這樣獲取可用編碼：

SortedMap<String, Charset> availableCharsets = Charset.availableCharsets();
Vector allEncodes = new Vector();
for (Map.Entry<String, Charset> entry : availableCharsets.entrySet()) {
            allEncodes.add(entry.getKey());
}

然後這樣讀取文件：

Reader in = new InputStreamReader(new FileInputStream(aPath), allEncodes.get(0) );

那麼在objective-c中怎麼實現類似的功能？

最佳回答：

我給的代碼有點類似Java.不過你要完善其中的readingError變量。核心代碼是avaiableStringEncodings.

  NSMutableArray *arrayOfEncodings = [[NSMutableArray alloc] init];

  const NSStringEncoding *encodings = [NSString availableStringEncodings];
  while (*encodings != 0){
    [arrayOfEncodings addObject:[NSNumber numberWithInt:*encodings]];
    encodings++;
  }

  NSError *readingError = nil;
  NSString yourPath = @"some path you want";
  NSData *data = [[NSData alloc] initWithContentsOfFile:yourPath    options:NSDataReadingUncached error:&readingError];

  NSStringEncoding firstEncoding = (NSStringEncoding) [((NSNumber *) [arrayOfEncodings objectAtIndex:0]) intValue];

  NSString *myString = [[NSString alloc] initWithData:data encoding:firstEncoding];