测试UNNotificationSettings

Question

测试结果始终为0，因为getNotificationSettingsWithCompletionHandler：块之后的代码在块中设置了notificationsAlertAuthorization值之前执行。

如何解决这个问题？

在AppDelegate.h中

：

- (BOOL)testNotificationsAuthorization;

AppDelegate.m中的

：

- (BOOL)testNotificationsAuthorization {
__block BOOL notificationsAlertAuthorization = 0;

[[UNUserNotificationCenter currentNotificationCenter] getNotificationSettingsWithCompletionHandler:^(UNNotificationSettings * _Nonnull settings) {
    if (settings.alertSetting == UNNotificationSettingEnabled) {
        notificationsAlertAuthorization = YES;
        NSLog(@"settings.alertSetting: YES");
    }
}];

// gets executed before notificationsAlertAuthorization is set,
// result is always NO.
if (notificationsAlertAuthorization == YES) {
    NSLog(@"Alert Authorization Granted");
    return YES;
} else {
    NSLog(@"Alert Authorization NOT Granted");
    return NO;
} }

ViewController中的

：

- (IBAction)testForNotificationSettings:(UIButton *)sender {
BOOL result = [[[UIApplication sharedApplication] delegate] testNotificationsAuthorization];
NSLog(@"testForNotificationSettings result: %d", result);}

日志：

2016-11-20 17：18：51.221 UserNotificationsTest [11873：536763]警告授权未授予 2016-11-20 17：18：51.222 UserNotificationsTest [11873：536763] testForNotificationSettings结果：0 2016-11-20 17：18：51.223 UserNotificationsTest [11873：536812] settings.alertSetting：YES

Answer 1

你需要使用CompletionHandlers来获得结果，因为你在CompletionHandle中获得了Notification的状态，并且在得到你正在比较它的结果之前，这就是为什么你得到错误的结果。

像这样改变你的方法

-(void) testNotificationsAuthorization :(void (^)(BOOL isActive))handler {
    [[UNUserNotificationCenter currentNotificationCenter] getNotificationSettingsWithCompletionHandler:^(UNNotificationSettings * _Nonnull settings) {
        if (settings.alertSetting == UNNotificationSettingEnabled) {
            handler(YES);
            NSLog(@"settings.alertSetting: YES");
        } else {
            NSLog(@"settings.alertSetting: NO");
            handler(NO);
        }
    }];
}

并像这样使用

[[[UIApplication sharedApplication] delegate] isNotificationActive:^(BOOL isActive) {
        if (isActive) {
            NSLog(@"settings.alertSetting: YES");
        } else {
            NSLog(@"settings.alertSetting: NO");
        }
    }];