创建本地通知,并给通知设置一个传递的信息
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
// 创建本地通知
- (IBAction)StartLocalNoteButtonClick:(id)sender {
// 创建本地通知
UILocalNotification *localNotification = [[UILocalNotification alloc]init];
// 设置属性
// 1.触发事件
localNotification.fireDate = [NSDate dateWithTimeIntervalSinceNow:5];
// 2.设置通知的显示内容
localNotification.alertBody = @"收到一条新消息";
// 设置传递的信息(自己设置,任意的Key,获取通知的时候需要使用此Key)
localNotification.userInfo = @{@"content":@"你妈喊你回家吃饭"};
// 预定通知(UIApplication 作为系统和应用的桥梁,一般负责应用和系统相关的工作)
// iOS 8.0以后,在预定和展示通知之前必须要注册通知,请求授权
[[UIApplication sharedApplication] scheduleLocalNotification:localNotification];
}
- (void)viewDidLoad {
[super viewDidLoad];
// 注册通知,请求授权
/*
UIUserNotificationTypeNone 无任何效果
UIUserNotificationTypeBadge 通知含有角标
UIUserNotificationTypeSound 带声音
UIUserNotificationTypeAlert 提示文字
*/
UIUserNotificationSettings *notificationSettings = [UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeAlert | UIUserNotificationTypeBadge | UIUserNotificationTypeSound categories:nil];
[[UIApplication sharedApplication] registerUserNotificationSettings:notificationSettings];
}
@end
在AppDelegate代理方法中接收到通知:
- 应用在后台时,点击通知进入应用后调用,应用在前台时,直接接收到通知但是没有视图变化
/**
* 当已经接收到本地通知后调用
*
* @param application 应用对象
* @param notification 接收到的本地通知
*/
- (void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification{
NSString *contentString = notification.userInfo[@"content"];
NSLog(@"%@",contentString);
}
本地通知.png
点击创建本地通知后,切换至后台,待5s后会收到本地通知,只有点击"打开"按钮进入程序的时候,才会执行didReceiveLocalNotification方法,打印结果:
本地通知[34499:293172] 你妈喊你回家吃饭
- 如果将应用杀死了,也是可以获取通知的
但并不能通过didReceiveLocalNotification方法获取通知信息了
这里因为将应用杀死无法通过控制台打印判断,为了验证,接下来在视图界面上添加一个Label,用来显示获取的通知信息:
- (void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification{
NSString *contentString = notification.userInfo[@"content"];
NSLog(@"%@",contentString);
[self showLocalNote:notification];
}
- (void)showLocalNote:(UILocalNotification *)localNote{
UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(50, 100, 200, 100)];
label.textColor = [UIColor blueColor];
label.text = localNote.userInfo[@"content"];
[self.window.rootViewController.view addSubview:label];
}
未显示通知消息.png
通过结果判断,虽然接收到了通知,但是点击"打开"进入应用后并未收到通知的信息,原因是杀死应用后,点击通知的"打开"按钮,相当于重新打开了一次应用,就不会再调用didReceiveLocalNotification方法了
如果应用是退出状态,接收到通知需要从didFinishLaunchingWithOptions方法中获取通知信息:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
/*
NSString *const UIApplicationLaunchOptionsURLKey;
NSString *const UIApplicationLaunchOptionsSourceApplicationKey;
NSString *const UIApplicationLaunchOptionsRemoteNotificationKey;
NSString *const UIApplicationLaunchOptionsLocalNotificationKey;
NSString *const UIApplicationLaunchOptionsAnnotationKey;
NSString *const UIApplicationLaunchOptionsLocationKey;
NSString *const UIApplicationLaunchOptionsNewsstandDownloadsKey;
NSString *const UIApplicationLaunchOptionsBluetoothCentralsKey;
NSString *const UIApplicationLaunchOptionsBluetoothPeripheralsKey;
NSString *const UIApplicationLaunchOptionsShortcutItemKey;
NSString *const UIApplicationLaunchOptionsUserActivityDictionaryKey;
NSString *const UIApplicationLaunchOptionsUserActivityTypeKey;
*/
UILocalNotification *localNote = launchOptions[UIApplicationLaunchOptionsLocalNotificationKey];
[self showLocalNote:localNote];
return YES;
}
点击创建本地通知后,结束应用,等待5s弹出提示后,再次点击"打开",进入应用,显示通知信息:
获取到本地通知信息.png