iOS实现截取字符串中汉字功能

#import "ViewController.h"
 
@interface ViewController ()
 
@end
 
@implementation ViewController
 
- (void)viewDidLoad {
 [super viewDidLoad];
 
 NSArray *array = @[@"03-15_01苹果", @"412香蕉", @"#7&@15橙子"];
 for (int i = 0; i < array.count; i++) {
  NSString *chineseStr = [self getChineseStringWithString:array[i]];
  NSLog(@"chineseStr = %@\n", chineseStr);
 }
}
 
- (NSString *)getChineseStringWithString:(NSString *)string
{
 //(unicode中文编码范围是0x4e00~0x9fa5)
 for (int i = 0; i < string.length; i++) {
  int utfCode = 0;
  void *buffer = &utfCode;
  NSRange range = NSMakeRange(i, 1);
  
  BOOL b = [string getBytes:buffer maxLength:2 usedLength:NULL encoding:NSUTF16LittleEndianStringEncoding options:NSStringEncodinGConversionExternalRepresentation range:range remainingRange:NULL];
  
  if (b && (utfCode >= 0x4e00 && utfCode <= 0x9fa5)) {
   return [string substringFromIndex:i];
  }
 }
 return nil;
}
 
@end