的tableView的cellForRowAtIndexPath调用后

Question

我取的实现代码如下 从设备和显示接触，但第一次接触屏幕弹出显示的联系*限，当我点击好实现代码如下numberofrow调用，但是我使用这个代码5秒 后的cellForRowAtIndexPath调用（这个问题只来当新的应用程序安装第一次） 和我加入委托和数据源在厦门国际银行和.h文件

-(void)getContactsFromAddressBook 
{ 

addressBook = ABAddressBookCreateWithOptions(NULL, NULL); 
if (ABAddressBookGetAuthorizationStatus() == kABAuthorizationStatusNotDetermined) { 
    ABAddressBookRequestAccessWithCompletion(addressBook, 
              ^(bool granted, CFErrorRef error) { 
               if (granted) 
                [self loadContacts]; 
              }); 
} 
else if (ABAddressBookGetAuthorizationStatus() == kABAuthorizationStatusAuthorized) { 
    [self loadContacts]; 
} 
else { 
    UIAlertView *alert=[[UIAlertView alloc] initWithTitle:Nil message:@"You don't have permission of access contacts for access go to Setting-> Doubls-> Contacts" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil]; 
    [alert show]; 
} 
} 

//加载接触

-(void)loadContacts 
{ 
[arr_Contact removeAllObjects]; 
CFErrorRef *error = NULL; 
ABAddressBookRef addressBook = ABAddressBookCreateWithOptions(NULL, error); 
allPeople = ABAddressBookCopyArrayOfAllPeople(addressBook); 
CFIndex numberOfPeople = ABAddressBookGetPersonCount(addressBook); 
//arr_Contact = (__bridge NSMutableArray*)allPeople; 
for(int i = 0; i < numberOfPeople; i++) { 

    ABRecordRef person = CFArrayGetValueAtIndex(allPeople, i); 

    NSString *firstName = (__bridge NSString *)(ABRecordCopyValue(person, kABPersonFirstNameProperty)); 
    NSString *lastName = (__bridge NSString *)(ABRecordCopyValue(person, kABPersonLastNameProperty)); 
    //NSLog(@"Name:%@ %@", firstName, lastName); 

    ABMultiValueRef phoneNumbers = ABRecordCopyValue(person, kABPersonPhoneProperty); 

    NSString *phoneNumber; 
    for (CFIndex i = 0; i < ABMultiValueGetCount(phoneNumbers); i++) { 
     phoneNumber = (__bridge_transfer NSString *) ABMultiValueCopyValueAtIndex(phoneNumbers, i); 
     // NSLog(@"phone:%@", phoneNumber); 
    } 
    NSMutableDictionary *dic = [[NSMutableDictionary alloc] init]; 
    if(firstName == nil) 
    { 
     firstName = @""; 
    } 
    if(lastName == nil) 
    { 
     lastName = @""; 
    } 
    if(phoneNumber == nil) 
    { 
     continue; 
    } 
    [dic setValue:[NSString stringWithFormat:@"%@ %@",firstName,lastName] forKey:@"firstName"]; 
    //[dic setValue:lastName forKey:@"lastName"]; 
    [dic setValue:phoneNumber forKey:@"phonesNum"]; 


    [arr_Contact addObject:dic]; 

} 
NSLog(@"arr all contact %@",arr_Contact); 


NSSortDescriptor *sorter = [[NSSortDescriptor alloc] 
          initWithKey:@"firstName" 
          ascending:YES 
          selector:@selector(compare:)] ; 
NSArray *sortDescriptors = [NSArray arrayWithObject: sorter]; 
[arr_Contact sortUsingDescriptors:sortDescriptors]; 

[arr_afterSearch addObjectsFromArray:arr_Contact]; 

[self createSectionList:arr_Contact]; 

} 

//创建部分

- (void) createSectionList: (id) wordArray 
{ 
for (int i = 0; i < 27; i++) [arr_searchContact addObject:[[NSMutableArray alloc] init]]; 
int k=0; 
NSLog(@"arr count is %lu",(unsigned long)[arr_Contact count]); 
for (k=0; k<[arr_Contact count]; k++) { 

    NSString *word = [NSString stringWithFormat:@"%@",[[arr_Contact valueForKey:@"firstName"]objectAtIndex:k]]; 

    if ([word length] == 0) continue; 
    @try { 
     range1 = [ALPHA rangeOfString:[[word substringToIndex:1] uppercaseString]]; 
     [[arr_searchContact objectAtIndex:range1.location]addObject:[arr_Contact objectAtIndex:k]]; 
    } 
    @catch (NSException * e) { 
     [[arr_searchContact objectAtIndex:26]addObject:[arr_Contact objectAtIndex:k]]; 
     NSLog(@"error"); 
    } 
    @finally { 
    } 
} 
[self.tblContact reloadData]; 
} 

//的tableview委托

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section 
{ 
NSInteger rows=0; 

if (IsSearching==TRUE) { 
    rows=[arr_afterSearch count]; 
} 
else{ 
    rows=[[arr_searchContact objectAtIndex:section] count]; 
} 



return rows; 
} 
-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
return 40; 
} 
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { 
NSInteger section=0; 

if (IsSearching==TRUE) { 
    section=1; 
} 
else{ 
    if ([arr_searchContact count]>0) { 
     section=[ALPHA_ARRAY count]; 
    } 
    else{ 
     section=0; 
    } 
} 

return section; 
} 
- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView 
{ 
if (IsSearching==TRUE) { 
    return nil; 
} 
else{ 
    return ALPHA_ARRAY; 
} 
} 
- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection: (NSInteger)section 
{ 
// create the parent view that will hold header Label 

if (IsSearching==TRUE) { 
    return nil; 
} 
else{ 

if([[arr_searchContact objectAtIndex:section] count]==0) 
{ 
    return nil; 
} 
else { 
    UIView* customView = [[UIView alloc] initWithFrame:CGRectMake(5.0, 0.0, 320.0, 25.0)]; 
    [customView setBackgroundColor:[UIColor colorWithRed:236.0/255.0 green:239.0/255.0 blue:240.0/255.0 alpha:1.0]]; 
    UILabel * headerLabel = [[UILabel alloc] initWithFrame:CGRectZero]; 
    headerLabel.backgroundColor = [UIColor clearColor]; 
    headerLabel.font = [UIFont systemFontOfSize:14]; 
    headerLabel.frame = CGRectMake(10.0, 0.0, 300.0, 24.0); 
    [headerLabel setText:[NSString stringWithFormat:@"%@",[ALPHA_ARRAY objectAtIndex:section]]]; 
    [headerLabel setTextColor:[UIColor lightGrayColor]]; 
    [customView addSubview:headerLabel]; 

    return customView; 
} 
} 
} 
-(CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section 
{ 
if (IsSearching==TRUE) { 
    return 0; 
} 
else{ 
    if([[arr_searchContact objectAtIndex:section] count]==0) 
    { 
     return 0; 
    } 
    else 
    { 
     return 25; 
    } 
} 
} 


-(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.backgroundColor=[UIColor clearColor]; 
    cell.accessoryType = UITableViewCellAccessoryNone; 

    UIView *selectionView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 280, 46)]; 
    [selectionView setBackgroundColor:[UIColor colorWithRed:236.0/255.0 green:82.0/255.0 blue:91.0/255.0 alpha:1.0]]; 
    cell.selectedBackgroundView = selectionView; 

    if ([tableView respondsToSelector:@selector(setSectionIndexColor:)]) { 
     tableView.sectionIndexBackgroundColor = [UIColor colorWithRed:250.0/255.0 green:250.0/255.0 blue:250.0/255.0 alpha:0.3]; 
     tableView.sectionIndexTrackingBackgroundColor = [UIColor whiteColor]; 
    } 
} 
NSMutableDictionary *dic = [arr_Contact objectAtIndex:indexPath.row]; 
//cell.textLabel.text = [dic objectForKey:@"firstName"]; 
//cell.lastNameLabel.text = [dic objectForKey:@"lastName"]; 
if (IsSearching==TRUE) { 
    NSDictionary *dic=[arr_afterSearch objectAtIndex:indexPath.row]; 
    if ([[dic objectForKey:@"firstName"] length]>0) { 
    cell.textLabel.text = [dic objectForKey:@"firstName"]; 
    } 
    else{ 
     cell.textLabel.text =[dic objectForKey:@"phonesNum"]; 
    } 
} 
else{ 
    NSDictionary *dic=[[arr_searchContact objectAtIndex:indexPath.section]objectAtIndex:indexPath.row]; 
    if ([[dic objectForKey:@"firstName"] length]>0) { 
     cell.textLabel.text = [dic objectForKey:@"firstName"]; 
    } 
    else{ 
     cell.textLabel.text =[dic objectForKey:@"phonesNum"]; 
    } 
} 
cell.textLabel.textColor=[UIColor darkGrayColor]; 
cell.textLabel.highlightedTextColor = [UIColor whiteColor]; 
cell.textLabel.font=[UIFont fontWithName:@"OpenSans" size:14.0]; 
return cell; 

} 

Answer 1

你需要确保你只更新从主队列中的UI。您的地址簿访问完成处理程序将在后台线程上执行。更改完成处理程序以在主队列上调用loadContacts。

if (ABAddressBookGetAuthorizationStatus() == kABAuthorizationStatusNotDetermined) { 
    ABAddressBookRequestAccessWithCompletion(addressBook, 
       ^(bool granted, CFErrorRef error) { 
        if (granted) { 
         dispatch_async(dispatch_get_main_queue(), ^{ 
          [self loadContacts]; 
         }); 
        } 
       });