通知模式实现两个textField传值及模态视图——iOS开发

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通知模式实现两个textField传值及模态视图——iOS开发

利用通知模式，实现两个不同界面的textField之间的传值，在界面二输入字符，传值到前一界面的textField。

界面的切换，这里暂时先用模态视图实现。（重点在传值，所以没纠结设计界面排版，丑了点大家见谅）

大家不要看代码看上去好像挺多，因为我没使用storyboard/xib，是代码实现布局，所以通知和模态视图切换的代码很少~

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实现效果：

点击下一页按钮，进入界面二：

在textField处输入字符串：

点击返回按钮，回到界面一，此时界面一的textField处也有字符串

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代码部分：

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AppDelegate.m

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#import "AppDelegate.h"#import "ViewController1.h"@interface AppDelegate ()@end@implementation AppDelegate- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];    self.window.backgroundColor = [UIColor whiteColor];    [self.window makeKeyAndVisible];    ViewController1 *vc1 = [[ViewController1 alloc] init];    self.window.rootViewController = vc1;    return YES;}

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ViewController1.m

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#import "ViewController1.h"#import "ViewController2.h"@interface ViewController1 (){    UITextField *text1;}@end@implementation ViewController1- (void)viewDidLoad {    [super viewDidLoad];    self.view.backgroundColor = [UIColor greenColor];    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(50, 50, 100, 50)];    label.text = @"界面一";    [self.view addSubview:label];    text1 = [[UITextField alloc] initWithFrame:CGRectMake(50, 150, 100, 50)];    text1.backgroundColor = [UIColor whiteColor];    [self.view addSubview:text1];    UIButton *button1 = [[UIButton alloc] initWithFrame:CGRectMake(50, 250, 100, 50)];    [button1 addTarget:self action:@selector(pushButtonAction:) forControlEvents:UIControlEventTouchUpInside];    [button1 setTitle:@"下一页" forState:UIControlStateNormal];    button1.backgroundColor = [UIColor blackColor];    [self.view addSubview:button1];//    注册观察者    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(returnAction:) name:@"chuanzhi" object:nil];    // Do any additional setup after loading the view.}- (void)returnAction:(NSNotification *)text {    text1.text = text.userInfo[@"returnInfo"];}- (void)pushButtonAction:(UIButton *)btn {    ViewController2 *vc2 = [[ViewController2 alloc] init];    vc2.modalPresentationStyle = UIModalPresentationFullScreen;  //切换效果    [self presentViewController:vc2 animated:YES completion:nil];}

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ViewController2.m

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#import "ViewController2.h"@interface ViewController2 (){    UITextField *text2;}@end@implementation ViewController2- (void)viewDidLoad {    [super viewDidLoad];    self.view.backgroundColor = [UIColor blueColor];    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(50, 50, 100, 50)];    label.text = @"界面二";    [self.view addSubview:label];    text2 = [[UITextField alloc] initWithFrame:CGRectMake(50, 150, 100, 50)];    text2.backgroundColor = [UIColor whiteColor];    [self.view addSubview:text2];    UIButton *button2 = [[UIButton alloc] initWithFrame:CGRectMake(50, 250, 100, 50)];    [button2 addTarget:self action:@selector(returnButtonAction:) forControlEvents:UIControlEventTouchUpInside];    [button2 setTitle:@"返回" forState:UIControlStateNormal];    button2.backgroundColor = [UIColor blackColor];    [self.view addSubview:button2];    // Do any additional setup after loading the view.}- (void)returnButtonAction:(UIButton *)btn {    NSDictionary *dic = @{@"returnInfo" : self->text2.text};    NSNotification *notification = [NSNotification notificationWithName:@"chuangzhi" object:nil userInfo:dic];    [[NSNotificationCenter defaultCenter] postNotification:notification];    [self dismissViewControllerAnimated:NO completion:nil];}