ios - 在 iOS 键盘扩展中播放系统点击声音

Question

我已按照这两个链接上的说明进行操作：

如何在自定义键盘中播放键盘点击声音？

https://developer.apple.com/library/ios/documentation/StringsTextFonts/Conceptual/TextAndWebiPhoneOS/InputViews/InputViews.html

并做了以下事情：

标题：

@interface Key : UIView <UIInputViewAudioFeedback>

执行：

- (BOOL) enableInputClicksWhenVisible {
    return YES;
}

- (void)tapped:(UITapGestureRecognizer *)sender
{
    [[UIDevice currentDevice] playInputClick];
    [self.delegate keyHit:_title];
}

但它仍然无法正常工作。我错过了什么？

Answer 1

每当您想在键盘扩展中播放系统点击声音时，请尝试此代码：

+ (void)keyboardClickSound {

    // Check system preference for current setting of Keyboard Click Sound.
    CFStringRef applicationID = CFSTR("/var/mobile/Library/Preferences/com.apple.preferences.sounds");
    Boolean keyExistsAndHasValidFormat;
    BOOL enableInputClicks
    = CFPreferencesGetAppBooleanValue(CFSTR("keyboard"), applicationID, &keyExistsAndHasValidFormat);

    // Note: If the key does not exist because it has never been changed by a user,
    //       set it to the default, YES.
    if (!keyExistsAndHasValidFormat)
        enableInputClicks = YES;

    // Play Keyboard Click Sound, if enabled.
    // Note: If Open Access=Off, no click sound.
    if (enableInputClicks)
        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0),
                   ^{ AudioServicesPlaySystemSound(1104); });
}

Answer 2

如果您的键盘扩展应用程序包含“RequestsOpenAccess”字段为 YES，
则键盘点击声音必须需要“允许完全访问”从
General > Keyboard > Keyboards > Your_keyboard 设置切换到 On。

如果它关闭，那么您将无法播放键盘按键声音。