消息传递之:IOS NSNotificationCenter,Android EventBus;

文章来自:http://blog.csdn.net/intbird

IOS

IOS系统自带 NSNotificationCenter

0,上图

1,初始化程序入口

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    MainViewController* mainView =  [[MainViewController alloc] init];    mainView.title  = @"Delegate";    self.navigatarController = [[UINavigationController alloc]init];    [self.navigatarController pushViewController:mainView animated:YES];    self.window = [[UIWindow alloc]initWithFrame:[[UIScreen mainScreen]bounds]];    self.window.rootViewController = self.navigatarController;    [self.window makeKeyAndVisible];    return YES;    return YES;}

2,注册监听和处理方法

#import "MainViewController.h"#import "EventViewController.h"@interface MainViewController ()@end@implementation MainViewController- (void)viewDidLoad {    [super viewDidLoad];    [[NSNotificationCenter defaultCenter]addObserver:self                                            selector:@selector(onEvent:)                                            name:@"EVENT_KEY"                                            object:nil];}-(void)onEvent:(NSNotification *)notifi{    NSString * message = notifi.name ;    message = [message stringByAppendingString:notifi.object];    _labText.text = message;    UIAlertController * alert  = [UIAlertController alertControllerWithTitle:notifi.name                                                                     message:notifi.object                                                              preferredStyle:UIAlertControllerStyleAlert];    UIAlertAction * alertCacel = [UIAlertAction actionWithTitle:@"Cacel"                                                          style:UIAlertActionStyleCancel                                                        handler:nil];    [alert addAction:alertCacel];    [ self presentViewController:alert animated:YES completion:nil];}- (IBAction)sendMessage:(id)sender {    EventViewController * eventView = [[EventViewController alloc] init];    [self.navigationController pushViewController:eventView animated:YES];}@end

3,调用事件方法

#import "EventViewController.h"@interface EventViewController ()@end@implementation EventViewController- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view from its nib.}- (IBAction)sendMessage:(id)sender {    [[NSNotificationCenter defaultCenter] postNotificationName:@"EVENT_KEY" object:@"post a message!"];}@end

Andorid使第三方EventBus

先看下系统自带的BroadcastReceiver

Anrdoid四大组件之一的BroadcastReceiver
动态注册广播接收器,处理 onReceiver(),
通过sendBroadcast(intent)方法发送广播;

   private BroadcastReceiver receiver = new BroadcastReceiver() {          @Override          public void onReceive(Context context, Intent intent) {              if(intent.getAction().equals(action)){              }          }      };    IntentFilter filter = new IntentFilter();    filter.addAction(action);    registerReceiver(receiver, intentFilter);

再看下EventBus

官方demo说明:
https://github.com/greenrobot/EventBus/blob/master/HOWTO.md
0,上图

1,gradle dependencies

dependencies {    compile fileTree(dir: 'libs', include: ['*.jar'])    compile 'com.android.support:appcompat-v7:22.2.1'    compile 'de.greenrobot:eventbus:3.0.0-beta1'}

2,注册监听,必须注意 @Subscribe public void method(){}

public class MainActivity extends AppCompatActivity {    TextView tvText;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        EventBus.getDefault().register(this);        findViewById(R.id.button_send).setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                startActivity(new Intent(MainActivity.this, EventBusActivity.class));            }        });        tvText = (TextView)findViewById(R.id.textView);    }    @Override    protected void onDestroy() {        super.onDestroy();        EventBus.getDefault().unregister(this);    }    @Subscribe    public void onEvent(EventBusEvent event) {        String msg = event.getMessage();        tvText.setText(msg);        Toast.makeText(this, msg, Toast.LENGTH_LONG).show();    }}

3,发送事件

public class EventBusActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_event);        findViewById(R.id.button_send).setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                EventBus.getDefault().post(new EventBusEvent("post a message!"));            }        });    }}

文章来自:http://blog.csdn.net/intbird
以上demo
IOS:https://github.com/intbird/IOSNSNotificationCenter
android:https://github.com/intbird/ANDIntbirdEventBus