布尔节能问题 [英] bool saving problem

问题描述

编辑

我已经得到了我的应用程序一个声音，开始时，应用程序启动时播放。进一步的，我有两个方法来播放和停止的声音：

i've got a sound in my app which begins to play when the app is started. further I've got two method to play and stop the sound:

-(void)playBgMusic {

NSString *path = [[NSBundle mainBundle] pathForResource:@"bgmusic" ofType:@"aif"];
theAudio = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:NULL];
theAudio.delegate = self;
[theAudio play];
[defaults setBool:NO forKey:@"isQuiet"]; }


 -(void)stopMusic {

[theAudio stop];
[defaults setBool:YES forKey:@"isQuiet"]; }

现在我有不同的viewControllers在我MAINVIEW有一个按钮，停止/启动音乐（取决于wheter音乐播放或不）。

Now I've got different viewControllers and in my mainView there's a button which stops/starts the music (depends on wheter music is playing or not).

所以我有：

-(IBAction)check {

isquiet = [defaults boolForKey:@"isQuiet"];

if (isquiet == YES) {

    [self playBgMusic];

    // Change button to indicate music is playing

} 

else {

    [self stopMusic];

    // Change the button to indicate music has stopped...
}

}

现在有一个问题。当应用程序启动时，声音播放，在那之后我可以preSS按钮，声音停止了，但后来我不能再次启动它。我已经把NSLogs在code，只见那布尔依然没有pressing的STOPBUTTON后。

Now there's a problem. The sound plays when the app is started, after that I can press the button and the sound is stopped but then I cant start it again. I've put NSLogs in the code and saw that the BOOL is still NO after pressing the stopButton.

哪里是我的错？

推荐答案

您在正确的轨道上，缺少的是实际保存bool值回NSUserDefaults的唯一的事情，当你开始/停止播放，所以每次你点击该按钮读它，你就会得到正确的值。

You are on the right track, the only thing missing is actually saving the bool value back to NSUserDefaults when you start/stop playing, so everytime you click the button and read it, you get the correct value.

给这个一个尝试，看看是否有帮助：

Give this a try and see if it helps:

-(IBAction)check 
{
    BOOL isQuiet = [userDefaults boolForKey:@"isQuiet"];
    if (isQuiet)
    {
        [self playBgMusic];
        // Change button to indicate music is playing
    } else {
        [self stopBgMusic];
        // Change the button to indicate music has stopped...
    }
}

然后在你的 playBgMusic 方法，添加以下内容：

[userDefaults setBool:NO forKey:@"isQuiet"];

而在你的 spotBgMusic 方法，添加以下内容：

[userDefaults setBool:YES forKey:@"isQuiet"];

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