Ios “错误”'；NSInvalidArgumentException'；，原因:'-[u NSCFDictionary objectAtIndex:]：发送到实例0x134d0a3c0'的无法识别的选择器&引用；

我正在我的应用程序上实施苹果推送通知服务。收到通知后，我想获取信息并将其添加到uitableview中。我是这样做的：

在

AppDelegate.m

文件中：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    [Pushbots sharedInstanceWithAppId:@"--my app id--"];
    [[Pushbots sharedInstance] receivedPush:launchOptions];
    return YES;
}

- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken {
    // This method will be called everytime you open the app
    // Register the deviceToken on Pushbots
    [[Pushbots sharedInstance] registerOnPushbots:deviceToken];
}

-(void)application:(UIApplication *)application didFailToRegisterForRemoteNotificationsWithError:(NSError *)error{
    NSLog(@"Notification Registration Error %@", [error userInfo]);
}

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo {
    //Handle notification when the user click it while app is running in background or foreground.
    [[Pushbots sharedInstance] receivedPush:userInfo];
    NSString *msg = [userInfo valueForKey:@"aps"];
    NSLog(@"Push Notification:%@",msg);

    [[NSUserDefaults standardUserDefaults]setObject:msg forKey:@"ReceivedNotifications"];
}

#import <UIKit/UIKit.h>
#import "AppDelegate.h"

int main(int argc, char * argv[]) {
    @autoreleasepool {
        return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
    }
}

在my

ViewController.m

中：

@interface ViewController () <UITableViewDataSource, UITableViewDelegate>
@property (weak, nonatomic) IBOutlet UITableView *notifTableView;
@end

@implementation ViewController
{
    NSMutableArray *notif;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    notif = [[NSUserDefaults standardUserDefaults] objectForKey:@"ReceivedNotifications"];
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [notif count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell"];
    cell.textLabel.text = [notif objectAtIndex:indexPath.row];
    return cell;
}

这是我的

main.m

文件：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    [Pushbots sharedInstanceWithAppId:@"--my app id--"];
    [[Pushbots sharedInstance] receivedPush:launchOptions];
    return YES;
}

- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken {
    // This method will be called everytime you open the app
    // Register the deviceToken on Pushbots
    [[Pushbots sharedInstance] registerOnPushbots:deviceToken];
}

-(void)application:(UIApplication *)application didFailToRegisterForRemoteNotificationsWithError:(NSError *)error{
    NSLog(@"Notification Registration Error %@", [error userInfo]);
}

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo {
    //Handle notification when the user click it while app is running in background or foreground.
    [[Pushbots sharedInstance] receivedPush:userInfo];
    NSString *msg = [userInfo valueForKey:@"aps"];
    NSLog(@"Push Notification:%@",msg);

    [[NSUserDefaults standardUserDefaults]setObject:msg forKey:@"ReceivedNotifications"];
}

#import <UIKit/UIKit.h>
#import "AppDelegate.h"

int main(int argc, char * argv[]) {
    @autoreleasepool {
        return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
    }
}

#导入
#导入“AppDelegate.h”
int main（int argc，char*argv[]）{
@自动释放池{
返回UIApplicationMain（argc、argv、nil、NSStringFromClass（[AppDelegate类]）；
}
}

---

怎么了？

=>在调用objectAtIndex时，请确保您的手上确实有一个数组：

错误消息清楚地表明，

objectAtIndex

的接收者是一个

NSDictionary

对象

它是从推送通知的

aps

对象创建的，推送通知实际上始终是一个字典，并使用键

ReceivedNotifications

以用户默认值保存

您必须解析字典以提取要显示的信息

---

PS：不要使用

valueForKey

——这是一种具有特殊行为的KVC方法——从字典中获取对象。指定的方法是

objectForKey

如何将其更改为数组对象？这取决于您将要完成的任务。标准的

aps

字典包含键

alert

和

badge

alert

本身是一个包含多个键的字典，

badge

是一个整数。枚举字典并获取所需的值和键。把它放到一个数组中。你有一个示例代码还是什么？我正在尝试获取手机收到的通知文本，并将其放入表格中。阅读以查看有效负载的结构。然后它只是一个订阅链

userInfo[“aps”][“alert”][“title”]或[“body”]

。当然，您必须将中间部分结果转换为有意义的内容，以满足编译器的要求。