更新到 ARC Obj-c 后声音不播放

Question

我最近用Automatic Reference Counting (ARC) 更新了我的项目，它破坏了我的 playAudio 方法（之前工作完美）。我是ARC 的新手，但我很确定这是由于保留计数或系统立即释放对象，所以你根本听不到声音播放。我创建了AudioPlayer 的 iVar 并尝试保持我自己的个人保留计数，如下面的问题链接所示。我从另一个类中调用 playSystemSound:，首先是 alloc]init;然后[class playSystemSound:1002]; 如果有人能指出我做错了什么，将不胜感激。

AVAudioPlayer not playing any sound

 @property (strong, nonatomic) AVAudioPlayer *soundToPlay;

-(void)playsystemSound:(long long)eventType{

NSString *path = [NSString stringWithFormat:@"/User/Library/Preferences/com.idd.iconomaticprefs.plist"];
NSMutableDictionary* savedDict = [NSMutableDictionary dictionary];
[savedDict addEntriesFromDictionary:[NSDictionary dictionaryWithContentsOfFile:path]];

NSMutableArray *activeThemesArray = [savedDict valueForKey:@"ActiveThemes"];

if ([activeThemesArray count]) {
    NSString *soundURL;
    for (NSString *name in activeThemesArray) {
        soundURL = [NSString stringWithFormat:@"/Library/Themes/%@/UISounds",name];
        if ([[NSFileManager defaultManager]fileExistsAtPath:soundURL]) {

            //UISounds avilable in theme determine event type
            if (eventType == 1002) {
                //respring?
                soundURL = [NSString stringWithFormat:@"/Library/Themes/%@/UISounds/lock.caf",name];
            }
            if (eventType == 1003) {
                soundURL = [NSString stringWithFormat:@"/Library/Themes/%@/UISounds/Anticipate.caf",name];
            }
            if (eventType == 1004) {
                soundURL = [NSString stringWithFormat:@"/Library/Themes/%@/UISounds/key_press_click.caf",name];
            }

            if (eventType == 1008) {
                soundURL = [NSString stringWithFormat:@"/Library/Themes/%@/UISounds/photoShutter.caf",name];
            }


            // setup session correctly
            AVAudioSession *audiosession = [AVAudioSession sharedInstance];
            [audiosession setCategory:AVAudioSessionCategoryAmbient error:nil];
            [audiosession setActive:YES error:nil];

            // play sound
            NSURL *url = [NSURL fileURLWithPath:soundURL];
            self.soundToPlay = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];
            [self.soundToPlay prepareToPlay];
            [self.soundToPlay play];

            break;
        }
    }
}

}

Answer 1

如果没有强引用保持它，您的 AudioSession 将在方法返回后立即消失。