Question

我在表视图中遇到问题，应用程序在我向下滚动时崩溃并尝试选择一行。我在控制台中遇到的错误是

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSArrayM insertObject:atIndex:]: object cannot be nil'

请帮助我理解为什么我收到此错误，我不认为我的数组中有任何nil元素，让我告诉你代码

我创建了一个SelectContactViewController，用户可以在其中选择联系人数量，以便文件

SelectContactController.h

#import <UIKit/UIKit.h>
#import <AddressBook/AddressBook.h>
#import <AddressBookUI/AddressBookUI.h>



@interface SelectContactController :UIViewController
<UITableViewDataSource, UITableViewDelegate>
{
    NSArray *selectedImageIds;
    NSArray *selectContacts;
}
@property (nonatomic, retain) NSArray *selectContacts;

和实现文件SelectContactController.m

#import "SelectContactController.h"



@interface SelectContactController ()

@end

@implementation SelectContactController
@synthesize selectContacts;
- (void)viewDidLoad
{
    [super viewDidLoad];


    selectContacts = [[NSArray alloc] init];
    selectedRows = [[NSMutableArray alloc] init];
    contactDictionary = [[NSMutableDictionary alloc] init];


    id appDelegate = (id)[[UIApplication sharedApplication] delegate];
    managedObjectContext = [appDelegate managedObjectContext];
    selectedImageIds = [appDelegate selectedImageIds];



    [self getAddressbookData];


}
#pragma mark - Address book Methods

-(void)getAddressbookData
{
#if __IPHONE_OS_VERSION_MIN_REQUIRED < 60000
    ABAddressBookRef addressBook = ABAddressBookCreate();
#else
    CFErrorRef *error = nil;
    ABAddressBookRef addressBook = ABAddressBookCreateWithOptions(NULL, error);
#endif

    NSArray * people;


    BOOL accessGranted = [self __addressBookAccessStatus:addressBook];

    if (accessGranted) {

        people = (__bridge_transfer NSArray*)ABAddressBookCopyArrayOfAllPeople(addressBook);
        // Do whatever you need with thePeople...

    }
    CFIndex nPeople = ABAddressBookGetPersonCount(addressBook);

    NSMutableArray *contactArray = [[NSMutableArray alloc] init];



    for (CFIndex i = 0; i < nPeople; i++) {
        ABRecordRef record = CFArrayGetValueAtIndex((__bridge CFArrayRef)(people), i);
        NSString *firstName = (__bridge NSString *)ABRecordCopyValue(record, kABPersonFirstNameProperty);
        NSString *lastName = (__bridge NSString *)ABRecordCopyValue(record, kABPersonLastNameProperty);
        NSString *fullName = nil;



        if (ABPersonGetCompositeNameFormat() == kABPersonCompositeNameFormatFirstNameFirst)
            fullName = [NSString stringWithFormat:@"%@ %@", firstName, lastName];
        else
            fullName = [NSString stringWithFormat:@"%@, %@", lastName, firstName];

        [contactArray addObject:fullName];

        //
        // Phone Numbers
        //
        ABMutableMultiValueRef phoneNumbers = ABRecordCopyValue(record, kABPersonPhoneProperty);
        CFIndex phoneNumberCount = ABMultiValueGetCount( phoneNumbers );


        NSMutableArray *numbersArray = [[NSMutableArray alloc] init];
        for ( CFIndex k=0; k<phoneNumberCount; k++ )
        {
            CFStringRef phoneNumberLabel = ABMultiValueCopyLabelAtIndex( phoneNumbers, k );
            CFStringRef phoneNumberValue = ABMultiValueCopyValueAtIndex( phoneNumbers, k );
            CFStringRef phoneNumberLocalizedLabel = ABAddressBookCopyLocalizedLabel( phoneNumberLabel );
            // converts "_$!<Work>!$_" to "work" and "_$!<Mobile>!$_" to "mobile"

            // Find the ones you want here
            //
           // NSLog(@"-----PHONE ENTRY -> name:%@ :  %@ : %@", fullName, phoneNumberLocalizedLabel, phoneNumberValue );
            [numbersArray addObject:CFBridgingRelease(phoneNumberValue)];

            CFRelease(phoneNumberLocalizedLabel);
            CFRelease(phoneNumberLabel);
            CFRelease(phoneNumberValue);
        }

       // NSLog(@"phone numbers %@", numbersArray);
        [contactDictionary setObject:numbersArray forKey:fullName];

        CFRelease(record);

    }

    selectContacts = contactArray;
   // NSLog(@"dictionary of array %@", contactDictionary);

    //NSLog(@"contacts count %d", [selectContacts count]);
}

-(BOOL)__addressBookAccessStatus:(ABAddressBookRef) addressBook
{
    __block BOOL accessGranted = NO;

    if (ABAddressBookRequestAccessWithCompletion != NULL) { // we're on iOS 6
        dispatch_semaphore_t sema = dispatch_semaphore_create(0);

        ABAddressBookRequestAccessWithCompletion(addressBook, ^(bool granted, CFErrorRef error) {
            accessGranted = granted;
            dispatch_semaphore_signal(sema);
        });

        dispatch_semaphore_wait(sema, DISPATCH_TIME_FOREVER);
        // dispatch_release(sema);
    }
    else { // we're on iOS 5 or older
        accessGranted = YES;
    }
    return accessGranted;
}



#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{

    // Return the number of sections.
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{

    // Return the number of rows in the section.
    NSLog(@"select content count %d", [selectContacts count]);
    return [selectContacts count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil) {

        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }

    cell.textLabel.text = [self.selectContacts objectAtIndex:indexPath.row];


    return cell;
}

请帮我解决此问题

Answer 1

异常消息非常明确：您正在尝试将nil值插入数组中。该错误可能在行

[numbersArray addObject:CFBridgingRelease(phoneNumberValue)];

在添加对象之前检查phoneNumberValue是否为零。另一个好主意是使用调试器来查找问题。在Xcode中运行应用程序之前添加异常断点。

Answer 2

我认为在这种情况下调试将是一个很好的解决方案。所以在这一行使用断点，让我知道它崩溃的索引。

   cell.textLabel.text = [self.selectContacts objectAtIndex:indexPath.row];

Answer 3

使用selectContacts = [[NSArray alloc] init];或selectContacts = contactArray;时，不使用setter。在分配或self.selectContacts时应该是@synthesize selectContacts = _selectContacts;，然后只在.m文件中使用_selectContacts。

Answer 4

对于少数数字，您可能没有提供名字和姓氏的详细信息，因此您必须尝试这样做：

if (ABPersonGetCompositeNameFormat() == kABPersonCompositeNameFormatFirstNameFirst)

        fullName = [[NSString alloc]initWithFormat:@"%@ %@", firstName, lastName];
     else
       fullName = [[NSString alloc]initWithFormat:@"%@, %@", lastName, firstName];
  if([fullName length]>0)

        [contactArray addObject:fullName];

UITableView在滚动时崩溃

4 个答案: