#import "AppDelegate.h"
@interface AppDelegate ()
@end
@implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
//初始化一个ViewController的一个对象
ViewController *view = [[ViewController alloc] init];
//把导航栏添加到上面
UINavigationController *navc = [[UINavigationController alloc] initWithRootViewController:view];
// self.window.rootViewController = navc;
//初始化第二个页面
SecondViewController *secondVc = [[SecondViewController alloc] init];
//
secondVc.tabBarItem.title = @"second";
secondVc.tabBarItem.badgeValue = @"2";
UITabBarController *tabbarcon = [[UITabBarController alloc] init];
tabbarcon.tabBar.tintColor = [UIColor greenColor];
[tabbarcon setViewControllers:@[navc,secondVc]];
self.window.rootViewController =tabbarcon;
return YES;
}
#import <UIKit/UIKit.h>
#import "SecondViewController.h"
@interface ViewController : UIViewController<UITableViewDataSource,UITableViewDelegate>
@property (nonatomic ,strong) UITableView *tableV;
@property (nonatomic ,strong) NSMutableArray *arry;
@end
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
//设置导航栏的biaot
self.title = @"first";
//设置触发跳到下一页的按钮
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"arrow_normal"] style:UIBarButtonItemStylePlain target:self action:@selector(tableView:didSelectRowAtIndexPath:)];
//初始化可变数组
self.arry = [NSMutableArray array];
//循环给数组赋值
for (int i = 0; i< 100; i++) {
[self.arry addObject:[NSString stringWithFormat:@"%i%i",i,i]];
}
//初始化tableV的大小及风格
self.tableV = [[UITableView alloc] initWithFrame:self.view.frame style:UITableViewStylePlain];
//指定self.tableV.delegate代理为self
self.tableV.delegate = self;
//给分隔栏设置颜色
self.tableV.separatorColor = [UIColor blueColor];
// //指定self.tableV.dataSource代理为self
self.tableV.dataSource = self;
//把tableV加载到view上
[self.view addSubview:self.tableV];
//指定单元格的唯一标识
[self.tableV registerClass:[UITableViewCell class] forCellReuseIdentifier:@"cell"];
}
//定义一个全局变量来接收索引indexPath.row
int num;
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
//设置每个分区显示的行数
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return self.arry.count;
}
//每个单元格显示的内容
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString *cellIdentity = @"cell";
//单元格重用机制
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentity forIndexPath:indexPath];
cell.textLabel.text = self.arry[indexPath.row];
cell.textLabel.textAlignment = NSTextAlignmentCenter;
//给cell添加背景色
cell.backgroundColor = [UIColor yellowColor];
return cell;
}
// 代理方法，显示选中单元格的信息
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
//初始化一个SecondViewController的对象
SecondViewController *second = [[SecondViewController alloc] init];
//把self.arry[indexPath.row]的值赋值给second.str
second.str = self.arry[indexPath.row];
//用num接收相应的索引
num = (int)indexPath.row;
//定义一个字符串str接收self.arry[indexPath.row]的值
NSString *str =self.arry[indexPath.row];
//初始化一个提示栏UIAlertController的对象并把他赋值
UIAlertController *alertC= [UIAlertController alertControllerWithTitle:@"你确定要点击它" message:str preferredStyle: UIAlertControllerStyleAlert];
//定义两个 UIAlertAction ，*action2取消
UIAlertAction *action2 = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleDefault handler:nil];
//*action1确定
UIAlertAction *action1 = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
//点击确定进入下一页
[self.navigationController pushViewController:second animated:YES];
}];
//把action1，action2添加到alertC上
[alertC addAction:action1];
[alertC addAction:action2];
//显示alertC
[self presentViewController:alertC animated:YES completion:nil];
}
//在窗体未加载之前添加监听
-(void)viewWillAppear:(BOOL)animated{
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(myPostValue:) name:@"lamco" object:nil];
}
//添加观察者
-(void)myPostValue:(NSNotification *)noti{
[self.arry replaceObjectAtIndex:num withObject:noti.object];
[self.tableV reloadData];
}
//移除观察者
-(void)dealloc{
[[NSNotificationCenter defaultCenter] removeObserver:self name:@"lamco" object:nil];
NSLog(@"销毁通知,移除观察者");
}
@end
#import <UIKit/UIKit.h>
@protocol postValuedelegate <NSObject>
-(void)postValue:(NSString *)Value;
@end
@interface SecondViewController : UIViewController<UITextFieldDelegate>
@property (nonatomic ,strong) NSString *str;
@property (nonatomic ,strong) UITextField *textfld;
@property (nonatomic ,assign) id<postValuedelegate> delegate;
@end
#import "SecondViewController.h"
@interface SecondViewController ()
@end
@implementation SecondViewController
- (void)viewDidLoad {
[super viewDidLoad];
//添加背景图片
UIImageView *imageV= [[UIImageView alloc] initWithFrame:self.view.frame ];
imageV.image = [UIImage imageNamed:@"82r58PICYeM_1024.jpg"];
self.view.backgroundColor = [UIColor colorWithPatternImage:imageV.image];
// 初始换文本框textfld
self.textfld = [[UITextField alloc] initWithFrame:CGRectMake(100, 200, 200, 100)];
//给文本框设置背景图片
UIImageView *imageV1 = [[UIImageView alloc] initWithFrame:self.textfld.frame];
imageV1.image = [UIImage imageNamed:@"27u58PICvXI_1024.jpg"];
self.textfld.backgroundColor = [UIColor colorWithPatternImage:imageV1.image];
//指定代理
self.textfld.delegate = self;
//通过属性str给文本框传值
self.textfld.text = self.str;
//把文本居中
self.textfld.textAlignment = NSTextAlignmentCenter;
//在view上显示textfld
[self.view addSubview:self.textfld];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
//隐藏键盘
-(BOOL)textFieldShouldReturn:(UITextField *)textField{
//1.通知
NSNotification *noti = [[NSNotification alloc] initWithName:@"lamco" object:textField.text userInfo:nil];
//单列，
[[NSNotificationCenter defaultCenter] postNotification:noti];
if ([textField isFirstResponder]) {
[textField resignFirstResponder];
}
[self.navigationController popToRootViewControllerAnimated:YES];
return YES;
}
@end