[Objective-C] 文字列操作関連

// 文字列連結
NSString *str1 = [NSString stringWithString:@"foo"];
NSString *str2 = [NSString stringWithString:@"bar"];
NSString *kekka = [str1 stringByAppendingString:str2];
// 最後の一文字削除
NSMutableString *strOrg = [NSMutableString stringWithString:@"hogehoge"];
NSInteger len = [strOrg length]; 
[strOrg deleteCharactersInRange:NSMakeRange(len-1,1)];