如何在不使用componentsSeparatedByString方法的情况下在目标c中打印NSString的反向？

Question

我想创建一个方法,给出string.suppose的反向我在方法中传递NSString"欢迎使用Objective C",该方法返回字符串的反向,如"C Objective to Welcome"而不是"C evitcejbO ot emocleW"而不使用componentsSeparatedByString方法.是否可以使用Objective c ..？请帮忙.

Answer 1

您可以按单词枚举字符串.

NSString *string = @"Welcome to Objective-C!";

NSMutableArray *words = [NSMutableArray array];

[string enumerateLinguisticTagsInRange:NSMakeRange(0, [string length])
                                scheme:NSLinguisticTagSchemeTokenType
                               options:0
                           orthography:nil
                            usingBlock:^(NSString *tag, NSRange tokenRange, NSRange sentenceRange, BOOL *stop) {
                                [array addObject:[string substringWithRange:tokenRange]];
                            }];

NSMutableString *reverseString = [[NSMutableString alloc] init];

for (NSString *word in [words reverseObjectEnumerator]){
    [reverse appendString:word];
}

NSLog(@"%@", reverseString);

这将打印...

"!C-Objective to Welcome"

您可以更改选项以省略空格和内容......