Question

我正在尝试在我的iphone应用程序中播放短暂的警报声我正在使用我发现的这个代码，但它不会播放任何声音。

NSString *toneFilename = [[NSBundle mainBundle] pathForResource:@"alarm" ofType:@"wav"];
    NSURL *toneURLRef = [NSURL fileURLWithPath:toneFilename];
    SystemSoundID Sound;

    AudioServicesCreateSystemSoundID(
                                     (__bridge CFURLRef) toneURLRef,
                                     &camerSound
                                     );

    AudioServicesPlaySystemSound(Sound);

当我尝试制作振动时，它可以工作：

AudioServicesPlayAlertSound(kSystemSoundID_Vibrate);

Thx

Answer 1

使用AVFoundationFramework

将AVFoundation.framework添加到项目中。

#import <AVFoundation/AVFoundation.h>

NSString *toneFilename = [[NSBundle mainBundle] pathForResource:@"alarm" ofType:@"wav"];
NSURL *toneURLRef = [NSURL fileURLWithPath:toneFilename];
AVAudioPlayer *player = [[AVAudioPlayer alloc] initWithContentsOfURL: toneURLRef error: nil];
player.currentTime = 0;
player.volume = 1.0f;
[player play];

Answer 2

创建声音时，您没有正确处理Sound变量。而是使用camerSound。使用正确的参数调用AudioServicesPlayAlertSound应该有效。

Answer 3

这对我来说非常适合。

将AVFoundation和AudioToolBox框架添加到项目中

#import <AVFoundation/AVFoundation.h>
#import <AudioToolbox/AudioToolbox.h>

@interface TestViewController : UIViewController
{
    SystemSoundID SoundID;
}

@implementation TestViewController
-(void) viewDidLoad {
    [super viewDidLoad];
    NSURL *url = [[NSBundle mainBundle] URLForResource:@"test" withExtension:@"caf"];
    AudioServicesCreateSystemSoundID((__bridge CFURLRef)url, &SoundID);  //When using ARC, make sure to use __bridge
 }

-(void) playSound {
     AudioServicesPlaySystemSound(SoundID);
 }

IOS播放短音

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