ios - Apple Mach-O链接器错误 “_AudioServicesCreateSystemSound”和另外1个

Question

我是iOS开发的新手，遇到了这个错误。我只是在项目中添加声音，并且已经导入了AudioToolbox.Framework，但是当我尝试构建项目时，它给了我上面的错误。它还给了我“Apple Mach-O Linker Error _AudioServicesDisposeSystemSoundID”和“Linker命令失败，退出代码为1(使用-v查看调用”。

这是我的代码:

CurrentLocationViewController.m

@implementation CurrentLocationViewController {
        CLLocationManager *locationManager;
        CLLocation *location;
        BOOL updatingLocation;
        NSError *lastLocationError;
        CLGeocoder *geocoder;
        CLPlacemark *placemark;
        BOOL performingReverseGeocoding;
        NSError *lastGeocodingError;
        UIActivityIndicatorView *spinner;
        SystemSoundID soundID;
    }

和:

- (void)viewDidLoad
{
    [super viewDidLoad];
    [self updateLabels];
    [self configureGetButton];
    [self loadSoundEffect];
}

也:

        lastGeocodingError = error;
        if (error == nil && [placemarks count] > 0) {
            if (placemark == nil) {
                NSLog(@"First Time!");
                [self playSoundEffect];
            }
            placemark = [placemarks lastObject];
        } else {
            placemark = nil;
        }

最后:

#pragma mark - Sound Effect

- (void)loadSoundEffect
{
    NSString *path  = [[NSBundle mainBundle] pathForResource:@"Sound.caf" ofType:nil];

    NSURL *fileURL = [NSURL fileURLWithPath:path isDirectory:NO];
    if (fileURL == nil) {
        NSLog(@"NSURL is nil for file file path: %@", path);
        return;
    }

    OSStatus error = AudioServicesCreateSystemSound((__bridge CFURLRef)fileURL,&soundID);

    if (error != kAudioServicesNoError) {
        NSLog(@"Error code %ld loading sound at path: %@", error, path);
        return;
    }
}

- (void)unloadSoundEffect
{
    AudioSystemDisposeSystemSoundID(soundID);
    soundID = 0;
}

- (void)playSoundEffect
{
    AudioServicesPlaySystemSound(soundID);
}

@end

当我调用AudioSystem / Services时，在行上有一个黄色警告，提示“函数'(该行的内容)的隐式声明在C99中无效”

任何帮助将不胜感激!谢谢!

Answer 1

将AudioServicesCreateSystemSound更改为AudioServicesCreateSystemSoundID