Question

我正在通过一个应用程序并添加我想要的功能，但随着时间的推移，我会遇到一些问题。

我希望有人能回答这个问题。

我想在我的应用上播放一些背景音乐，并且通过在AppDelegate中使用此代码实现了这一点

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{


    NSString* resourcePath = [[NSBundle mainBundle] resourcePath];
    resourcePath = [resourcePath stringByAppendingString:@"/smb1-1.mp3"];
    NSLog(@"Path to play: %@", resourcePath);
    NSError* err;

    //Initialize our player pointing to the path to our resource
    player = [[AVAudioPlayer alloc] initWithContentsOfURL:
              [NSURL fileURLWithPath:resourcePath] error:&err];

    if( err ){
        //bail!
        NSLog(@"Failed with reason: %@", [err localizedDescription]);
    }
    else{
        //set our delegate and begin playback
        player.delegate = self;
        [player play];
        player.numberOfLoops = -1;
        player.currentTime = 0;
        player.volume = 0.5;

    }

    // Override point for customization after application launch.
    return YES;
}

所以一切都很好。然而，我想要的是音频在应用程序完成启动后3秒开始播放，而不是直接播放。

有谁知道如何设置延迟或者可能以不同的方式解释。每次音乐修复之前，我都不会有延迟，只是第一次初次发布。

提前致谢。

Answer 1

希望这有帮助：

在你的appDelegate中创建一个BOOL iVar：

@implementation aaaAppDelegate        
{
    BOOL firstTime;
}

将此添加到didFinishLaunchingWithOptions方法：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Override point for customization after application launch.
    firstTime = YES;
    return YES;
}

将此添加到appDelegate中的applicationDidBecomeActive方法。

    - (void)applicationDidBecomeActive:(UIApplication *)application
    {
        if (firstTime)
        {
            firstTime = NO;
            [self performSelector:@selector(playMusic) withObject:nil afterDelay:3.0];
        }
    }

将您的音乐播放代码从didFinishLaunchingWithOptions移至名为playMusic的单独方法：

 -(void)playMusic
 {
     NSString* resourcePath = [[NSBundle mainBundle] resourcePath];
     resourcePath = [resourcePath stringByAppendingString:@"/smb1-1.mp3"];
     NSLog(@"Path to play: %@", resourcePath);
     NSError* err;

     //Initialize our player pointing to the path to our resource
     player = [[AVAudioPlayer alloc] initWithContentsOfURL:
     [NSURL fileURLWithPath:resourcePath] error:&err];

     if( err ){
         //bail!
         NSLog(@"Failed with reason: %@", [err localizedDescription]);
     }
     else{
         //set our delegate and begin playback
         player.delegate = self;
         [player play];
         player.numberOfLoops = -1;
         player.currentTime = 0;
         player.volume = 0.5;

     }
 }

延迟背景音乐开始

1 个答案: