ios – “尝试将第0行插入第0部分,但更新后第0部分只有0行”错误

概述我有一个应用程序,从他们的联系人列表中选择一个人,并采取他们的名字,姓氏和电子邮件.然后它将第一个名称保存到nsmutablearray并将其放入uitableview单元格中.一旦在模拟器中选择了联系人,我的问题就出现了. 码： .H： #import <UIKit/UIKit.h>#import <AddressBookUI/AddressBookUI.h>@interface Firs 我有一个应用程序,从他们的联系人列表中选择一个人,并采取他们的名字,姓氏和电子邮件.然后它将第一个名称保存到nsmutablearray并将其放入uitablevIEw单元格中.一旦在模拟器中选择了联系人,我的问题就出现了.

码：

.H：

#import <UIKit/UIKit.h>#import <AddressBookUI/AddressBookUI.h>@interface FirstVIEwController : UIVIEwController <    ABPeoplePickerNavigationControllerDelegate,UItableVIEwDelegate,UItableVIEwDataSource>- (IBAction)showPicker:(ID)sender;@property (weak,nonatomic) IBOutlet Nsstring *firstname;@property (weak,nonatomic) IBOutlet Nsstring *email;@property (weak,nonatomic) IBOutlet Nsstring *lastname;@property (weak,nonatomic) IBOutlet UItableVIEw *mytableVIEw;@property (strong,nonatomic) NSMutableArray *contacts;@end

.M：

#import "FirstVIEwController.h"@interface FirstVIEwController ()@end@implementation FirstVIEwController@synthesize firstname;@synthesize email;@synthesize lastname;@synthesize contacts;@synthesize mytableVIEw;- (voID)vIEwDIDLoad{    [super vIEwDIDLoad];    // Do any additional setup after loading the vIEw,typically from a nib.    contacts = [[NSMutableArray alloc]initWithObjects:nil];}- (voID)dIDReceiveMemoryWarning{    [super dIDReceiveMemoryWarning];    // dispose of any resources that can be recreated.}#pragma mark - UItableVIEw Datasource-(NSInteger)numberOfSectionsIntableVIEw:(UItableVIEw *)tableVIEw{    return 1;} -(NSInteger)tableVIEw:(UItableVIEw *)tableVIEw numberOfRowsInSection:(NSInteger)section{    return contacts.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 = [contacts objectAtIndex:indexPath.row];    return cell;}- (IBAction)showPicker:(ID)sender {    ABPeoplePickerNavigationController *picker =    [[ABPeoplePickerNavigationController alloc] init];    picker.peoplePickerDelegate = self;    [self presentModalVIEwController:picker animated:YES];}- (voID)peoplePickerNavigationControllerDIDCancel:(ABPeoplePickerNavigationController *)peoplePicker{    [self dismissModalVIEwControllerAnimated:YES];}- (BOol)peoplePickerNavigationController:(ABPeoplePickerNavigationController *)peoplePicker      shouldContinueAfterSelectingPerson:(ABRecordRef)person {    [self displayPerson:person];    [self dismissModalVIEwControllerAnimated:YES];    return NO;}- (BOol)peoplePickerNavigationController:(ABPeoplePickerNavigationController *)peoplePicker      shouldContinueAfterSelectingPerson:(ABRecordRef)person                                property:(ABPropertyID)property                              IDentifIEr:(ABMultiValueIDentifIEr)IDentifIEr{    return NO;}- (voID)displayPerson:(ABRecordRef)person{    Nsstring* name = (__brIDge_transfer Nsstring*)ABRecordcopyValue(person,kABPersonFirstnameProperty);    self.firstname = name;    Nsstring* last = (__brIDge_transfer Nsstring*)ABRecordcopyValue(person,kABPersonLastnameProperty);    self.lastname = last;    ABMultiValueRef  emails = ABRecordcopyValue(person,kABPersonEmailProperty);    Nsstring *emailID = (__brIDge Nsstring *)ABMultiValuecopyValueAtIndex(emails,0);//0     for "Home Email" and 1 for "Work Email".    self.email = emailID;    if (!(contacts))    {        contacts = [[NSMutableArray alloc]init];    }    [contacts insertObject:firstname atIndex:0];    NSIndexPath * indexPath = [NSIndexPath indexPathForRow:0 inSection:0];    [self.mytableVIEw insertRowsAtIndexPaths:@[indexPath]  withRowAnimation:UItableVIEwRowAnimationautomatic];}@end

解决方法 UItableVIEw必须始终与数据源保持同步.如果数据源可以在后台线程中更改,则必须特别小心.

当某些内容添加到数据源时,请尽快调用beginUpdate / insert / endUpdate.您不必担心缓存这些,UItableVIEw会在确定有足够的cpu时间和资源时缓存要执行的更改.

调用endUpdates时,UItable将再次询问dataSource的节数和行数.如果直接来自dataSource的节和行的数量,则数字节和行,加上插入,减去删除必须等于numberOfSections和numberOfRowsInSection的结束调用返回的数字.

最后一个提示：避免混合调用’reloadData’和beginUpdate / endUpdate对.使用其中一个,而不是两个.

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