我无法在TriggerIO插件中维护实例,因此我需要一种静态方式来响应AVAudioPlayer
事件。但是,我无法将player.delegate
设置为audio_API
,所以我有点卡住了。
audio_API.h:
@interface audio_API : NSObject<AVAudioPlayerDelegate>
audio_API.m:
static AVAudioPlayer* player = nil;
@implementation audio_API
+ (void)play:(ForgeTask*)task {
// parse the file url from the file object
ForgeFile* file = [[ForgeFile alloc] initWithFile:[task.params objectForKey:@"file"]];
NSString* fileURL = [file url];
NSLog(@"Playing file at %@", fileURL);
NSURL* url = [NSURL URLWithString:fileURL];
// TESTING
url = [[NSBundle mainBundle] URLForResource:@"seconds.m4a" withExtension:nil];
// END TESTING
NSAssert(url, @"URL is invalid.");
// create the player
NSError* error = nil;
player = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error];
if(!player)
{
NSLog(@"Error creating player: %@", error);
};
// player.delegate = audio_API;
[player play];
[task success:nil];
}
+ (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag
{
if (flag) {
[ForgeLog d:@"Audio finished playing successfully."];
} else {
[ForgeLog d:@"Audio did not finish playing successfully."];
}
// call the audio.finishedPlaying event
[[ForgeApp sharedApp] event:@"audio.finishedPlaying" withParam:nil];
}
+ (void)audioPlayerDecodeErrorDidOccur:(AVAudioPlayer *)player error:(NSError *)error
{
[ForgeLog d:@"Audio had error decoding."];
[ForgeLog e:error];
// call the audio.decodeErrorOccurred event
[[ForgeApp sharedApp] event:@"audio.decodeErrorOccurred" withParam:nil];
}
@end
关于如何进行这项工作的任何想法?
谢谢。
委托必须是一个对象,但是audio_API
是类型名称。但是,您可以简单地将委托分配为audio_API
的类对象:
player.delegate = (id<AVAudioPlayerDelegate>)[audio_API class];
注意:如果不强制转换类对象,编译器会抱怨,因为即使在[audio_API class]
的接口上指定了委托,Class
也会返回Class<AVAudioPlayerDelegate>
,而不是audio_API
对我来说,这有助于使管理声音的课程成为AVAudioPlayerDelegate。SoundManager.h文件:
#import <Foundation/Foundation.h>
#import <AVFoundation/AVFoundation.h>
@interface SoundManager : NSObject<AVAudioPlayerDelegate> {
}
并且在.m文件中,您可以有选择地为委托实现回调,例如:
-(void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag
{
NSLog(@"audioPlayerDidFinishPlaying %d",flag);
}