更改 cordova-nativeaudio 插件

Question

我正在尝试更改 Cordova 插件，以便可以从 javascript 更改 iOS 音乐类别，但我在 Cordova 构建日志中收到警告

知道我的代码有什么问题吗？第一个参数有效，第二个无效

audio.setCategory('AVAudioSessionCategoryAmbient', 
                  'AVAudioSessionCategoryOptionMixWithOthers')

和 iOS 部分：

- (void) setCategory:(CDVInvokedUrlCommand *)command {

    NSArray* arguments = command.arguments;
    NSString *category = [arguments objectAtIndex:0];
    NSString *options = [arguments objectAtIndex:1];

    [[AVAudioSession sharedInstance] setCategory:category withOptions:options error:nil];


    [self.commandDelegate sendPluginResult:[CDVPluginResult resultWithStatus:CDVCommandStatus_OK] callbackId:command.callbackId];
}

我收到以下警告

/project/koeriersapp/Plugins/cordova-plugin-nativeaudio/NativeAudio.m:67:71: 警告：指向整数转换的不兼容指针发送'NSString *__strong' 到“AVAudioSessionCategoryOptions”类型的参数（又名“枚举 AVAudioSessionCategoryOptions”）[-Wint-conversion] [[AVAudioSession sharedInstance] setCategory:category withOptions:options error:nil]; ^~~~~~~~~~~~ 在从导入的模块'AVFoundation'中 /project/koeriersapp/Plugins/cordova-plugin-nativeaudio/NativeAudio.h:11： /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS10.1.sdk/System/Library/Frameworks/AVFoundation.framework/Frameworks/AVFAudio.framework/Headers/AVAudioSession.h:364 :85: 注意：在此处将参数传递给参数“选项” - (BOOL)setCategory:(NSString *)category withOptions:(AVAudioSessionCategoryOptions)options error:(NSError **)outError NS_AVAILABLE_IOS(6_0); ^

Answer 1

您不能将NSString 作为options 传递给：

[[AVAudioSession sharedInstance] setCategory:category withOptions:options error:nil]; 

应该是AVAudioSessionCategoryOptions枚举。

要解决它，您可以将匹配器编写为：

AVAudioSessionCategoryOptions optionsOrig = 0;

if([options isEqualToString: @"AVAudioSessionCategoryOptionMixWithOthers"]){
    optionsOrig = AVAudioSessionCategoryOptionMixWithOthers;
}

[[AVAudioSession sharedInstance] setCategory: category withOptions:optionsOrig error:nil];

---

参考：

- (BOOL)setCategory:(NSString *)category 
    withOptions:(AVAudioSessionCategoryOptions)options 
          error:(NSError * _Nullable *)outError;

参见文档here