UITableView的增删改插
// AppDelegate.m文件
#import "AppDelegate.h"
#import "RootTableViewController.h"
@interface AppDelegate ()
@end
@implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window.rootViewController=[[UINavigationController alloc]initWithRootViewController:[[RootTableViewController alloc]initWithStyle:UITableViewStylePlain]];
return YES;
}
// ViewController.h文件
#import <UIKit/UIKit.h>
// 1、创建协议
@protocol PostViewDelegate <NSObject>
-(void)postValue:(NSString *)userName;
@end
@interface ViewController : UIViewController<UITextFieldDelegate>
@property (strong,nonatomic) NSString *name;
@property (strong,nonatomic) UITextField *textName;
@property (strong,nonatomic) id <PostViewDelegate> delegatepp;
@end
// ViewController.m文件
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor=[UIColor greenColor];
self.textName=[[UITextField alloc]initWithFrame:CGRectMake(100, 100, 200, 44)];
self.textName.delegate=self;
self.textName.backgroundColor=[UIColor lightGrayColor];
//文本赋值
self.textName.text=self.name;
//设置边框样式
self.textName.borderStyle=1;
[self.view addSubview:self.textName];
}
-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
if (self.delegatepp) {
[self.delegatepp postValue:textField.text ];
}
//键盘控制
if ([textField isFirstResponder]) {
[textField resignFirstResponder];
}
//出栈，显示上一页
[self.navigationController popViewControllerAnimated:YES];
return YES;
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
// RootTableViewController.h文件
#import <UIKit/UIKit.h>
@interface RootTableViewController : UITableViewController
@property (strong,nonatomic) NSMutableArray *students;
@end
// RootTableViewController.m文件
#import "RootTableViewController.h"
#import "ViewController.h"
@interface RootTableViewController ()<PostViewDelegate>
{
//成员变量：存储每次点击的索引值
NSIndexPath *currentIndexPath;
}
@end
@implementation RootTableViewController
- (void)viewDidLoad {
[super viewDidLoad];
//导航栏上的Edit 删除
self.navigationItem.rightBarButtonItem = self.editButtonItem;
//添加leftBarButtonItem 增加
self.navigationItem.leftBarButtonItem=[[UIBarButtonItem alloc]initWithBarButtonSystemItem:4 target:self action:@selector(addItem)];
//数据源
self.students=[NSMutableArray arrayWithCapacity:0];
[self.students addObject:@"lisi"];
[self.students addObject:@"zhangsan"];
[self.students addObject:@"zhaoliu"];
[self.students addObject:@"wangwu"];
//指定重用单元格唯一标识
[self.tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"myCell"];
}
//增加
-(void)addItem
{
UIAlertController *alertController=[UIAlertController alertControllerWithTitle:@"增加学生信息" message:@"输入姓名" preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *actionAdd=[UIAlertAction actionWithTitle:@"增加" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
UITextField *textName = alertController.textFields[0];
[self.students addObject:textName.text];
//NSLog(@"真正的超作对象");
[self.tableView reloadData];
}];
[alertController addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
textField.placeholder=@"inpus name";
}];
[alertController addAction:actionAdd];
[self presentViewController:alertController animated:YES completion:^{
}];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - Table view data source
//返回分区数
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
//返回显示的每个分区的行数
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return self.students.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"myCell" forIndexPath:indexPath];
//主标题显示的内容
cell.textLabel.text=self.students[indexPath.row]
;
return cell;
}
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
ViewController *view=[[ViewController alloc]init];
//赋值
view.name=self.students[indexPath.row];
//指定代理对象
view.delegatepp=self;
//每次点击的索引值
currentIndexPath=indexPath;
//下一页
[self.navigationController pushViewController:view animated:YES];
}
//代理协议方法的实现
-(void)postValue:(NSString *)userName
{
self.students[currentIndexPath.row]=userName;
//刷新，重新加载
[self.tableView reloadData];
}
// Override to support conditional editing of the table view.
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath {
// Return NO if you do not want the specified item to be editable.
return YES;
}
//删除
// Override to support editing the table view.
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
if (editingStyle == UITableViewCellEditingStyleDelete) {
// Delete the row from the data source
[self.students removeObject:self.students[indexPath.row]];
//重新加载，相当于[self.tableView reloadData]，只是删除哪行，刷新哪行， withRowAnimation:UITableViewRowAnimationFade 是加一个动画效果
[tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
}
else if (editingStyle == UITableViewCellEditingStyleInsert) {
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
}
}
// Override to support rearranging the table view.
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath {
//找到指定位置的集合元素
NSString *name=self.students[fromIndexPath.row];
//删除此集合元素
[self.students removeObject:name];
//插入此集合元素到指定位置
[self.students insertObject:name atIndex:toIndexPath.row];
NSLog(@"%@",self.students);
}
// Override to support conditional rearranging of the table view.
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath {
// Return NO if you do not want the item to be re-orderable.
return YES;
}
@end
