Question

我得到的错误如下所示plz帮助我提前谢谢，这是错误iam得到索引0超出空数组的界限'***第一次抛出调用堆栈：---＆gt;＆gt; 以下是我的代码：

-(void)retriveContactsFromAddressBook
{
    //CFErrorRef error = NULL;
     ABAddressBookRef addressBook = ABAddressBookCreateWithOptions(NULL, NULL);

    if (addressBook!=nil)
    {
        NSArray *allContacts=(__bridge_transfer NSArray*)ABAddressBookCopyArrayOfAllPeople(addressBook);
        NSUInteger i=0;
        for ( i = 0; i<[allContacts count]; i++)
        {
            ABRecordRef contactPerson = (__bridge ABRecordRef)allContacts[i];
             NSString *firstName = (__bridge_transfer NSString*)ABRecordCopyValue(contactPerson, kABPersonFirstNameProperty);
            NSString *lastName=(__bridge_transfer NSString*)ABRecordCopyValue(contactPerson, kABPersonLastNameProperty);

            if (i==0) {
                self.FirstName=[NSMutableArray arrayWithObject:firstName];
                if (lastName==nil) {
                    self.LastName=[[NSMutableArray alloc]init];
                } else {
                    self.LastName=[NSMutableArray arrayWithObject:lastName];
                }

            } else {
                [self.FirstName addObject:firstName];

                if (lastName==nil) {
                    [self.LastName addObject:@""];
                } else {
                     [self.LastName addObject:lastName];
                }
            }
            NSString *full=[NSString stringWithFormat:@"%@ %@",[self.FirstName objectAtIndex:i],[self.LastName objectAtIndex:i]];

            if (i==0) {
                self.fullName=[NSMutableArray arrayWithObject:full];
            } else {
                [self.fullName addObject:full];
            }
        }
    }
    else
    {
        NSLog(@"Error Address book empty");
    }
}

我收到如下错误----＆gt;＆gt;＆gt;

>Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]: index 0 beyond bounds for empty array'
    *** First throw call stack:
    (0x2ce265f7 0x3a560c77 0x2cd3a157 0x126419 0x125edb 0x125cb7 0x302ce46d 0x30378325 0x3037824d 0x303777d1 0x3037750b 0x30377271 0x30377209 0x302cb97f 0x2fcf6f65 0x2fcf2951 0x2fcf27d9 0x2fcf21c7 0x2fcf1fd1 0x2fcebedd 0x2cded015 0x2cdea6f9 0x2cdeaafb 0x2cd37b31 0x2cd37943 0x340f0051 0x3032d6f1 0x1e1ea9 0x3aafcaaf)
    libc++abi.dylib: terminating with uncaught exception of type NSException
    (lldb)

Answer 1

-(void)retriveContactsFromAddressBook
{
    //CFErrorRef error = NULL;
    ABAddressBookRef addressBook = ABAddressBookCreateWithOptions(NULL, NULL);

    self.LastName=[[NSMutableArray alloc]init];
    self.FirstName=[[NSMutableArray alloc]init];
    self.fullName=[NSMutableArray arrayWithObject:full];

    if (addressBook!=nil)
    {
        NSArray *allContacts=(__bridge_transfer NSArray*)ABAddressBookCopyArrayOfAllPeople(addressBook);
        NSUInteger i=0;
        for ( i = 0; i<[allContacts count]; i++)
        {
            ABRecordRef contactPerson = (__bridge ABRecordRef)allContacts[i];
            NSString *firstName = (__bridge_transfer NSString*)ABRecordCopyValue(contactPerson, kABPersonFirstNameProperty);
            NSString *lastName=(__bridge_transfer NSString*)ABRecordCopyValue(contactPerson, kABPersonLastNameProperty);

            if (firstName == nil) {
                [self.FirstName addObject:@""];
            } else {
                [self.FirstName addObject:firstName];
            }

            if (lastName==nil) {
                [self.LastName addObject:@""];
            } else {
                [self.LastName addObject:lastName];
            }

            NSString *full=[NSString stringWithFormat:@"%@ %@",[self.FirstName objectAtIndex:i],[self.LastName objectAtIndex:i]];

            [self.fullName addObject:full];
        }
    }
    else
    {
        NSLog(@"Error Address book empty");
    }
}

像这样使用..

self.LastName=[[NSMutableArray alloc]init];

这一行是问题..如果lastname是nil你没有插入任何对象

NSString *full=[NSString stringWithFormat:@"%@ %@",[self.FirstName objectAtIndex:i],[self.LastName objectAtIndex:i]];

但是在这一行[self.LastName objectAtIndex:i]中你尝试从空数组中检索对象是否有问题......

Answer 2

Nayeemuddin你正在访问一个没有内容的数组，所以发生了异常。

NSString *full=[NSString stringWithFormat:@"%@ %@",[self.FirstName objectAtIndex:i],[self.LastName objectAtIndex:i]];

这里是访问不存在的数组的对象。你也忘了初始化第二个数组，

 self.LastName=[[NSMutableArray alloc]init];

Answer 3

分配时，需要在姓氏数组中插入空条目。

for ( i = 0; i<[allContacts count]; i++)
{
            ABRecordRef contactPerson = (__bridge ABRecordRef)allContacts[i];
             NSString *firstName = (__bridge_transfer NSString*)ABRecordCopyValue(contactPerson, kABPersonFirstNameProperty);
            NSString *lastName=(__bridge_transfer NSString*)ABRecordCopyValue(contactPerson, kABPersonLastNameProperty);

            if (i==0) {
                self.FirstName=[NSMutableArray arrayWithObject:firstName];
                if (lastName==nil) {
                    self.LastName=[[NSMutableArray arrayWithObject:@""];  // <--- This
                } else {
                    self.LastName=[NSMutableArray arrayWithObject:lastName];
                }

            } else {
                [self.FirstName addObject:firstName];

                if (lastName==nil) {
                    [self.LastName addObject:@""];
                } else {
                     [self.LastName addObject:lastName];
                }
            }

索引0超出空数组的边界'***第一个抛出调用堆栈：

3 个答案: