ios - __NSArrayM 插入对象 :atIndex:]; object cannot be nil

Question

我是 iOS 开发的新手。我想做加密和解密。我的问题如下:当我运行我的代码时，解密在模拟器中运行良好，但它没有在 iPhone 设备上运行。我收到如下所示的错误消息:

[__NSArrayM insertObject:atIndex:]: object cannot be nil

这是我的代码。我定义了一个包含多个字符串的数组:

<dictionary>
<array>
      <string>india,chennai,salem,coimbatore,krishnagiri,hosur,palghat</string>
      <string>india1,chennai1,salem1,coimbatore1,krishnagiri1,hosur1,palghat1</string>
</array>
</dictionary>

NSString *stringIndex1 = [[NSString alloc]init];
NSMutableArray *arrAthigaaramList1;
dictDecryptList=[[NSMutableDictionary alloc]init];

for(int i=0;i<[arrD_Chapter count];i++)//50 Chapter wise
        {
            stringIndex1 = [arrD_Chapter objectAtIndex:i];
            NSData  *b64DecData = [Base64 decode:stringIndex1];
            NSData *decryptedData = [[NSData alloc]init];
            decryptedData= [b64DecData AESDecryptWithPassphrase:@"mypassword"];
            NSString *decryptedStr = [[NSString alloc] initWithData:decryptedData encoding:NSUTF32StringEncoding];

            NSLog(@"Decryped Data Base 64 encoded = %@",decryptedStr);

            [arrAthigaaramList1 addObject:decryptedStr];    
        }

这段代码有什么问题？

Answer 1

您应该执行以下操作:

NSString *stringIndex1 = [[NSString alloc]init];
NSMutableArray *arrAthigaaramList1 = [[NSMutableArray alloc] init];
dictDecryptList=[[NSMutableDictionary alloc]init];

for(int i=0;i<[arrD_Chapter count];i++)//50 Chapter wise
    {
        stringIndex1 = [arrD_Chapter objectAtIndex:i];
        NSData  *b64DecData = [Base64 decode:stringIndex1];
        NSData *decryptedData = [[NSData alloc]init];
        decryptedData= [b64DecData AESDecryptWithPassphrase:@"mypassword"];
        NSString *decryptedStr = [[NSString alloc] initWithData:decryptedData encoding:NSUTF32StringEncoding];

        if (decryptedStr) {
            NSLog(@"Decryped Data Base 64 encoded = %@",decryptedStr);
            [arrAthigaaramList1 addObject:decryptedStr];
        } else {
            NSLog(@"ERROR decrypting!!!");
        }


    }

这会让你做两件事:

1) 初始化可变数组。2) 解密并记录错误后，不要尝试插入 nil 字符串。