- (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. NSString *currentText = @"原因很明显了,微信首要任务是换着法子从用户口袋里捞钱,不会想让用户仅仅把他当做聊天工具,让用户进入微信多看广告才是微信想要做的(但微信吃相这么难看"; [currentText enumerateSubstringsInRange:NSMakeRange(0, currentText.length) options:NSStringEnumerationByComposedCharacterSequences usingBlock:^(NSString * _Nullable substring, NSRange substringRange, NSRange enclosingRange, BOOL * _Nonnull stop) { printf("%s",[[ViewController getFirstLetter:substring] UTF8String]); }]; } +(NSString *)getFirstLetter:(NSString *) strInput { if ([strInput length]) { NSMutableString *ms = [[NSMutableString alloc] initWithString:strInput]; // 1. kCFStringTransformMandarinLatin 表示中文转拉丁字母,NULL 表示转换范围为整个字符串 CFStringTransform((__bridge CFMutableStringRef)ms, NULL, kCFStringTransformMandarinLatin, NO); // 2. kCFStringTransformStripDiacritics,去掉音调 CFStringTransform((__bridge CFMutableStringRef)ms, 0, kCFStringTransformStripDiacritics, NO); // 3. 转换结果是按将个汉字的拼音以空格分隔的,我们将每个汉字的拼音按空格切开放到数组中 NSArray *pyArray = [ms componentsSeparatedByString:@" "]; if(pyArray && pyArray.count > 0) { ms = [[NSMutableString alloc] init]; // 4. 只取每个汉字的首字母 for (NSString *strTemp in pyArray) { [ms appendString:[strTemp substringToIndex:1]]; } return [ms uppercaseString]; } ms = nil; } return nil; }