#import <Foundation/Foundation.h>@interface NSString (PinyinInitials)/**获取汉字拼音的首字母, 返回的字母是大写形式, 例如: @"俺妹", 返回 @"A".*如果字符串开头不是汉字, 而是字母, 则直接返回该字母, 例如: @"b彩票", 返回 @"B".*如果字符串开头不是汉字和字母, 则直接返回 @"#", 例如: @"&哈哈", 返回 @"#".*字符串开头有特殊字符(空格,换行)不影响判定, 例如@"       a啦啦啦", 返回 @"A".*/- (NSString *)getFirstLetter;@end
#import "NSString+PinyinInitials.h"#define HANZI_START 19968#define HANZI_COUNT 20902static char firstLetterArray[HANZI_COUNT] 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NSString (PinyinInitials)- (NSString *)getFirstLetter{NSString *words = [self stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];if (words.length == 0) {return nil;}NSString *result = nil;unichar firstLetter = [words characterAtIndex:0];int index = firstLetter - HANZI_START;if (index >= 0 && index <= HANZI_COUNT) {result = [NSString stringWithFormat:@"%c", firstLetterArray[index]];} else if ((firstLetter >= 'a' && firstLetter <= 'z')|| (firstLetter >= 'A' && firstLetter <= 'Z')) {result = [NSString stringWithFormat:@"%c", firstLetter];} else {result = @"#";}return [result uppercaseString];}@end

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