通讯录 CoreData & tabelView

数据持久化的增删改查

通过 FRC 和 CoreData 动态刷新tabelView 数据

#import "ViewController.h"
#import "Person.h"

@interface ViewController ()<UISearchResultsUpdating,UISearchControllerDelegate,NSFetchedResultsControllerDelegate,UITableViewDataSource,UITableViewDelegate>

@property (weak,
nonatomic) IBOutlet
UIView *seachView;

@property(nonatomic,strong)UISearchController * searchController;

@property (weak,
nonatomic) IBOutlet
UITableView *tableView;

@property(nonatomic,strong)NSManagedObjectContext * managedObjectContext;
@property(nonatomic,strong)NSFetchedResultsController * fetchedResultsController;

@end

@implementation ViewController

- (void)viewDidLoad {
[super
viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[self
loadShuJu];
[self
loadSearch];

}

-(void)viewDidAppear:(BOOL)animated{
[self
updateSearchResultsForSearchController:self.searchController];
}

//配置 searchController
-(void)loadSearch
{
self.searchController = [[UISearchController
alloc]initWithSearchResultsController:nil];
// 使 searchBar的大小自动适应 searchController
的大小
[self.searchController.searchBar
sizeToFit];
// 是否可以在子代视图中显示
self.definesPresentationContext =
YES;
// 编辑搜索框时是否隐藏背景
self.searchController.dimsBackgroundDuringPresentation =
NO;
// 编辑搜索框时是否隐藏 navigationBar
self.searchController.hidesNavigationBarDuringPresentation =
NO;
// 贴视图
[self.seachView
addSubview:self.searchController.searchBar];
// 设置代理
self.searchController.searchResultsUpdater =
self;
self.searchController.delegate =
self;
}

//配置数据
-(void)loadShuJu
{
// 设置代理
self.tableView.dataSource =
self;

// 获取上下文
UIApplication * app = [UIApplication
sharedApplication];
id delegate = app.delegate;
self.managedObjectContext = [delegate
managedObjectContext];

// 通过实体名获取请求
NSFetchRequest * request = [NSFetchRequest
fetchRequestWithEntityName:NSStringFromClass([Person
class])];
// 排序规则
NSSortDescriptor * sort1 = [NSSortDescriptor
sortDescriptorWithKey:@"firstN"
ascending:YES];
NSSortDescriptor * sort2 = [NSSortDescriptor
sortDescriptorWithKey:@"name"
ascending:YES];

[request setSortDescriptors:@[sort1,sort2]];

// 请求转化为需要显示的数据
self.fetchedResultsController = [[NSFetchedResultsController
alloc]initWithFetchRequest:request
managedObjectContext:self.managedObjectContext
sectionNameKeyPath:@"firstN"
cacheName:nil];

NSError * error;
// 执行 fetchedResultsController
if (![self.fetchedResultsController
performFetch:&error]) {
NSLog(@"%@",error.localizedDescription);
return;
}

// 代理
self.fetchedResultsController.delegate =
self;
}

#pragma mark - 配置 tabelView

//section
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
return
self.fetchedResultsController.sections.count;
}

//每个 section
的行数
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
NSArray * sections =
self.fetchedResultsController.sections;
id<NSFetchedResultsSectionInfo>sectionInfo = sections[section];
return [sectionInfo
numberOfObjects];
}

//每个 cell
显示的内容
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath
*)indexPath
{
Person * person = [self.fetchedResultsController
objectAtIndexPath:indexPath];
UITableViewCell * cell = [tableView
dequeueReusableCellWithIdentifier:@"cell"
forIndexPath:indexPath];
cell.textLabel.text = person.name;
cell.detailTextLabel.text = person.tel;
cell.imageView.image = person.headImg;

return cell;
}

//每个 section
的标题
-(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
NSArray * arr = [self.fetchedResultsController
sections];
id<NSFetchedResultsSectionInfo>secInfo = arr[section];
return [secInfo
name];
}

//一下三个回调配置删除，增加数据（以删除为例）

// 是否可编辑
-(BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
return
YES;
}

-(UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath
*)indexPath
{
return
UITableViewCellEditingStyleDelete;
}

//点击删除按钮时执行的操作
-(void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle
forRowAtIndexPath:(NSIndexPath *)indexPath
{
Person * person = [self.fetchedResultsController
objectAtIndexPath:indexPath];
[self.managedObjectContext
deleteObject:person];
NSError * error;
if (![self.managedObjectContext
save:&error]) {
NSLog(@"%@",error.localizedDescription);
return;
}
}

#pragma mark - 配置 searchController
回调

//当搜索框文本变化是执行的操作
-(void)updateSearchResultsForSearchController:(UISearchController *)searchController
{

// 优化代码
if (![[searchController.searchBar
text] length]) {
[self
loadShuJu];
[self.tableView
reloadData];
return;
}

NSFetchRequest * requset = [NSFetchRequest
fetchRequestWithEntityName:NSStringFromClass([Person
class])];

// 谓词查询 CONTAINS[cd]
表示包含
// OR 表示‘或’
NSPredicate * predicate = [NSPredicate
predicateWithFormat:@"name CONTAINS[cd] %@ OR tel CONTAINS[cd] %@",[self.searchController.searchBar
text],[self.searchController.searchBar
text]];

[requset setPredicate:predicate];

NSSortDescriptor * sort1 = [NSSortDescriptor
sortDescriptorWithKey:@"firstN"
ascending:YES];
NSSortDescriptor * sort2 = [NSSortDescriptor
sortDescriptorWithKey:@"name"
ascending:YES];

[requset setSortDescriptors:@[sort1,sort2]];

self.fetchedResultsController = [[NSFetchedResultsController
alloc]initWithFetchRequest:requset
managedObjectContext:self.managedObjectContext
sectionNameKeyPath:@"firstN"
cacheName:nil];
NSError * error;
if (![self.fetchedResultsController
performFetch:&error]) {
NSLog(@"%@",error.localizedDescription);
return;
}
// 此时 fetchedResultsController
已经变化，但是 tabelView 还没有变化，需要 reloadData
一下
[self.tableView
reloadData];
}

//当点击取消搜索时的回调
-(void)didDismissSearchController:(UISearchController *)searchController
{
[self
loadShuJu];
[self.tableView
reloadData];
}

//点击 cell
进入到编辑页面需要传值
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([sender
isKindOfClass:[UITableViewCell
class]]) {
NSLog(@"传值");
UITableViewCell * cell = (UITableViewCell *)sender;
NSIndexPath * indexpath = [self.tableView
indexPathForCell:cell];
Person * person = [self.fetchedResultsController
objectAtIndexPath:indexpath];
UIViewController * view = [segue
destinationViewController];
// 下一个 View
应该设置一个属性名为 person （key
的值）的属性用来接收 person
[view setValue:person
forKey:@"person"];
}
}

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

// FRC 回调

- (void)controllerWillChangeContent:(NSFetchedResultsController *)controller {
[self.tableView
beginUpdates];
}

- (void)controller:(NSFetchedResultsController *)controller didChangeSection:(id <NSFetchedResultsSectionInfo>)sectionInfo
atIndex:(NSUInteger)sectionIndex forChangeType:(NSFetchedResultsChangeType)type {

switch(type) {
case
NSFetchedResultsChangeInsert:
[self.tableView
insertSections:[NSIndexSet
indexSetWithIndex:sectionIndex]
withRowAnimation:UITableViewRowAnimationFade];
break;

case
NSFetchedResultsChangeDelete:
[self.tableView
deleteSections:[NSIndexSet
indexSetWithIndex:sectionIndex]
withRowAnimation:UITableViewRowAnimationFade];
break;
}
}

- (void)controller:(NSFetchedResultsController *)controller didChangeObject:(id)anObject
atIndexPath:(NSIndexPath *)indexPath forChangeType:(NSFetchedResultsChangeType)type
newIndexPath:(NSIndexPath *)newIndexPath {

UITableView *tableView =
self.tableView;

switch(type) {

case
NSFetchedResultsChangeInsert:
[tableView insertRowsAtIndexPaths:[NSArray
arrayWithObject:newIndexPath]
withRowAnimation:UITableViewRowAnimationFade];
break;

case
NSFetchedResultsChangeDelete:
[tableView deleteRowsAtIndexPaths:[NSArray
arrayWithObject:indexPath]
withRowAnimation:UITableViewRowAnimationFade];
break;

case
NSFetchedResultsChangeUpdate:
[tableView reloadRowsAtIndexPaths:@[indexPath]
withRowAnimation:UITableViewRowAnimationFade];
break;

case
NSFetchedResultsChangeMove:
[tableView deleteRowsAtIndexPaths:[NSArray
arrayWithObject:indexPath]
withRowAnimation:UITableViewRowAnimationFade];
[tableView insertRowsAtIndexPaths:[NSArray
arrayWithObject:newIndexPath]
withRowAnimation:UITableViewRowAnimationFade];
break;
}
}

- (void)controllerDidChangeContent:(NSFetchedResultsController *)controller {
[self.tableView
endUpdates];
}
@end

#import "AddTableViewController.h"
#import "Person.h"

@interface AddTableViewController ()<UIImagePickerControllerDelegate,UIActionSheetDelegate>

@property (weak,
nonatomic) IBOutlet
UIButton *headImg;

@property (weak,
nonatomic) IBOutlet
UITextField *lblName;

@property (weak,
nonatomic) IBOutlet
UITextField *lblTel;

@property(nonatomic,strong)NSManagedObjectContext * managedObjectContext;

@property(nonatomic,strong)Person * person;

@property(nonatomic,strong)UIImagePickerController * picker;

@end

@implementation AddTableViewController

- (void)viewDidLoad {
[super
viewDidLoad];

[self
loadShuJu];

}

-(void)loadShuJu
{
UIApplication * app = [UIApplication
sharedApplication];
id delegate = app.delegate;
self.managedObjectContext = [delegate
managedObjectContext];

// 编辑，添加用的是同一页面，所以需要进行判断
if (self.person) {
self.lblName.text =
self.person.name;
self.lblTel.text =
self.person.tel;
[self.headImg
setImage:self.person.headImg
forState:UIControlStateNormal];
[self.managedObjectContext
deleteObject:self.person];
NSError * error;
if (![self.managedObjectContext
save:&error]) {
NSLog(@"%@",error.localizedDescription);
return;
}
NSLog(@"编辑");

self.title =
@"编辑";
}else{
self.title =
@"添加联系人";
NSLog(@"联系");
}
}

//界面显示时初始化 UIImagePickerController
-(void)viewDidAppear:(BOOL)animated{
self.picker = [[UIImagePickerController
alloc]init];
}

- (IBAction)tapHeadImg:(id)sender {
// UIImagePickerController 代理
self.picker.delegate =
self;

UIActionSheet* actionSheet = [[UIActionSheet
alloc]
initWithTitle:@"请选择文件来源"
delegate:self
cancelButtonTitle:@"取消"
destructiveButtonTitle:nil
otherButtonTitles:@"照相机",@"摄像机",@"本地相簿",@"本地视频",nil];
[actionSheet showInView:self.view];

}

//通过 actionSheet
选择UIImagePickerController的 type
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
switch (buttonIndex) {
case 0://照相机
{
self.picker.sourceType =
UIImagePickerControllerSourceTypeCamera;
[self
presentViewController:self.picker
animated:YES
completion:nil];
}
break;
case 1://摄像机
{

self.picker.sourceType =
UIImagePickerControllerSourceTypeCamera;
self.picker.videoQuality =
UIImagePickerControllerQualityTypeLow;
[self
presentViewController:self.picker
animated:YES
completion:nil];
}
break;
case 2://本地相簿
{

self.picker.allowsEditing =
YES;
self.picker.sourceType =
UIImagePickerControllerSourceTypePhotoLibrary;
[self
presentViewController:self.picker
animated:YES
completion:nil];
}
break;
case 3://本地视频
{

self.picker.allowsEditing =
YES;
self.picker.sourceType =
UIImagePickerControllerSourceTypePhotoLibrary;
[self
presentViewController:self.picker
animated:YES
completion:nil];
}
break;
default:
break;
}
}

// UIImagePickerController 选择完图片时的回调
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary
*)info{
UIImage * image = info[UIImagePickerControllerOriginalImage];
[self.headImg
setImage:image forState:UIControlStateNormal];
[self
dismissViewControllerAnimated:YES
completion:nil];
}

- (IBAction)save:(id)sender {
self.person = [NSEntityDescription
insertNewObjectForEntityForName:NSStringFromClass([Person
class]) inManagedObjectContext:self.managedObjectContext];
self.person.name =
self.lblName.text;
self.person.tel =
self.lblTel.text;
self.person.headImg =
self.headImg.currentImage;
self.person.firstN =
self.person.getFirstN;

NSError * error;
if (![self.managedObjectContext
save:&error]) {
NSLog(@"%@",error.localizedDescription);
return;
}

// 如果 name
和 Tel 都为空，则删除这条数据（当时想过如果在上一条就进行判断，如果为空则直接不进行保存即可，但是这样在返回到电话簿首页时会显示一条空数据，这条数据没有保存，在下次重启程序时不会显示，这个问题在使用 UITabelViewController
时是不存在的,）

if ((![self.person.name
length]) && (![self.person.tel
length])) {

[self.managedObjectContext
deleteObject:self.person];
NSError * error;
if (![self.managedObjectContext
save:&error]) {
NSLog(@"%@",error.localizedDescription);
return;
}

}

// 返回上一界面
[self.navigationController
popViewControllerAnimated:YES];

}

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

@end