objective-c 中文转utf-8字符串

 

keyString 为中文字符串  区分数字与英文 以分号分隔

NSMutableString *keyWord = [NSMutableString stringWithFormat:@""];

//转码

for (int i=0; i<[keyString length]; i++) {

NSUInteger location = i;

unichar temp = [keyString characterAtIndex:location];

NSString *str = [NSString stringWithFormat: @"%C", temp];

//NSLog(@"str = %@", str);

NSString *str2 = [str stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

//NSLog(@"str2 = %@", str2);

[keyWord appendString:str2];

[keyWord appendString:@";"];

}