使用 NSLog 将地址簿打印到控制台

Question

我在我的viewWillAppear: 中使用它来将我所有的联系人姓名和号码打印到我的控制台。

- (void)viewWillAppear:(BOOL)animated
{
    CFErrorRef error = nil;
    // Request authorization to Address Book
    ABAddressBookRef addressBookRef = ABAddressBookCreateWithOptions(NULL, &error);

    if (ABAddressBookGetAuthorizationStatus() == kABAuthorizationStatusNotDetermined) {
        ABAddressBookRequestAccessWithCompletion(addressBookRef, ^(bool granted, CFErrorRef error)
        {
            if (granted) {
                // First time access has been granted, add all the user's contacts to array.

                contactsObjects = (__bridge NSMutableArray *)(ABAddressBookCopyArrayOfAllPeople(addressBookRef));
            } else {
                // User denied access.
                // Display an alert telling user that they must allow access to proceed to the "invites" page.
            }
        });
    }
    else if (ABAddressBookGetAuthorizationStatus() == kABAuthorizationStatusAuthorized) {
        // The user has previously given access, add all the user's contacts to array.

        contactsObjects = (__bridge NSMutableArray *)(ABAddressBookCopyArrayOfAllPeople(addressBookRef));
    }
    else {
        // The user has previously denied access
        // Send an alert telling user that they must allow access to proceed to the "invites" page.
    }

    NSLog(@"%@", contactsObjects);
}

这是输出

带有此错误消息：

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFType length]: unrecognized selector sent to instance 0x16ec2190'***

有什么问题？

EDIT 发现抛出异常的断点问题： 完整的.m：

@synthesize inviteTableSearchBar;

@synthesize contactsObjects;
@synthesize facebookObjects;
@synthesize twitterObjects;
@synthesize searchResults;

//lazy instantiations <below>-------
- (NSArray *)contactsObjects
{
    if(!contactsObjects)
    {
        contactsObjects = [[NSArray alloc]init];
    }

    return contactsObjects;
}

- (NSMutableArray *)searchResults
{
    if(!searchResults)
    {
        searchResults = [[NSMutableArray alloc]init];
    }

    return searchResults;
}
//lazy instantiations <above>-------

- (id)initWithStyle:(UITableViewStyle)style
{
    self = [super initWithStyle:style];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewWillAppear:(BOOL)animated
{
    CFErrorRef error = nil;
    // Request authorization to Address Book
    ABAddressBookRef addressBookRef = ABAddressBookCreateWithOptions(NULL, &error);

    if (ABAddressBookGetAuthorizationStatus() == kABAuthorizationStatusNotDetermined) {
        ABAddressBookRequestAccessWithCompletion(addressBookRef, ^(bool granted, CFErrorRef error)
        {
            if (granted) {
                // First time access has been granted, add all the user's contacts to array.

                contactsObjects = (__bridge_transfer NSArray *)(ABAddressBookCopyArrayOfAllPeople(addressBookRef));
            } else {
                // User denied access.
                // Display an alert telling user that they must allow access to proceed to the "invites" page.
            }
        });
    }
    else if (ABAddressBookGetAuthorizationStatus() == kABAuthorizationStatusAuthorized) {
        // The user has previously given access, add all the user's contacts to array.

        contactsObjects = (__bridge_transfer NSMutableArray *)(ABAddressBookCopyArrayOfAllPeople(addressBookRef));
    }
    else {
        // The user has previously denied access
        // Send an alert telling user that they must allow access to proceed to the "invites" page.
    }

    NSLog(@"%@", contactsObjects);
}

- (void)viewDidLoad
{
    [super viewDidLoad];

    //CUSTOM APPEARANCE <below>

    //set in order to actually change the search bar's UIColor.
    [self.inviteTableSearchBar setBackgroundImage:[UIImage new]];
    [self.inviteTableSearchBar setTranslucent:YES];

    self.inviteTableSearchBar.backgroundColor = [UIColor colorWithHexString:@"#333333"];
    [[UILabel appearanceWhenContainedIn:[UISearchBar class], nil] setTextColor:[UIColor colorWithHexString:@"#669900"]];

    //Uncomment the following line to preserve selection between presentations; YES to clear tableView when the tableViewController recieves `viewWillAppear:`
    self.clearsSelectionOnViewWillAppear = YES;

    //Fill array
    //[self.contactsObjects addObject:@"Examples<below>"];
    //[self.contactsObjects addObject:@"John"];
    //[self.contactsObjects addObject:@"Sanford"];
    //[self.contactsObjects addObject:@"Sally"];
    //[self.contactsObjects addObject:@"Susan B. Anthony"];

    // Hide the search bar until user scrolls up
    CGRect newBounds = self.tableView.bounds;
    newBounds.origin.y = newBounds.origin.y + inviteTableSearchBar.bounds.size.height;
    self.tableView.bounds = newBounds;

}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return self.contactsObjects.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"inviteCell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];

    //configure the cells
    cell.textLabel.text = self.contactsObjects[indexPath.row];

    return cell;
}

问题出在//configure the cells 下方的cell.textLabel.text = self.contactsObjects[indexPath.row]; 上。在cellForRowAtIndexPath: 方法中。

Answer 1

这意味着您试图向地址 0x175c4b10 处的对象询问其长度，但它不是响应方法 length 的对象。该错误可能不在您发布的代码中，因为您没有在那里对length 方法进行任何调用。可能是您在其他地方调用length（搜索您的代码在哪里），或者可能是您调用的方法最终调用length，但您传递给它的参数无效。

Answer 2

#define CHECK_NULL_STRING(str) ([str isKindOfClass:[NSNull class]] || !str)?@"":str

 id p=[contactsObjects objectAtIndex:indexPath.row];
    NSString *fName=(__bridge NSString *)(ABRecordCopyValue((__bridge ABRecordRef)(p), kABPersonSortByFirstName));
      NSString *lName=(__bridge NSString *)(ABRecordCopyValue((__bridge ABRecordRef)(p), kABPersonSortByLastName));
cell.textLabel.text=[NSString stringWithFormat:@"%@ %@",CHECK_NULL_STRING(fName),CHECK_NULL_STRING(lName)]