when my app starts music is playing:
-(void)playBgMusic {
NSString *path = [[NSBundle mainBundle] pathForResource:@"bgmusic" ofType:@"aif"];
theAudio = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:NULL];
theAudio.delegate = self;
[theAudio play]; }
but he should be able to turn the music off by pressing a button if he presses the button again the music should turn on again. i have:
-(IBAction)check {
if (isquiet == NO) {
[theAudio stop];
isquiet = YES;
defaults = [NSUserDefaults standardUserDefaults];
[defaults setBool:YES forKey:@"stringKey"];
}
else {
[self playBgMusic];
isquiet = NO;
defaults = [NSUserDefaults standardUserDefaults];
[defaults setBool:NO forKey:@"stringKey"]; } }
I think I didn't get it. Now it works in my first ViewController that I can turn the music on and off but when I go to another viewController while the music is playing, then back again and press the button, the music doesn't stop and when i press it many times the music is played a second time and overlaps.
What's still wrong?
No need to wrap it in an NSNumber, there are some convenience methods for this:
To set a BOOL, use:
[userDefaults setBool:YESorNO forKey:@"yourKey"];
To access it, use:
[userDefaults boolForKey:@"yourKey"];
[EDIT TO ANSWER YOUR ADDITIONAL QUESTION]
Not sure why you are using NSUserDefaults - it seems unnecessary for what you are trying to achieve? Here's what I would do for a button that can start/stop music:
-(IBAction)check
{
if (isQuiet)
{
// Play music
// Change the button to indicate it is playing...
} else
{
// Stop music
// Change the button to indicate it has stopped...
}
// Set your isQuiet to be the opposite of what it was when the button was clicked
isQuiet = !isQuiet;
}
Box your BOOL value to NSNumber object and add it to NSUserDefault:
NSUserDefaults *boolUserDefaults = [NSUserDefaults standardUserDefaults];
[boolUserDefaults setObject:[NSNumber numberWithBool:isquiet]
forKey:@"stringKey"];
Later you'll be able to retrieve that value as plain BOOL using -boolForKey: function in NSUserDefaults
To save:
[boolUserDefaults setObject:[NSNUmber numberWithBool:isQuiet] forKey:@"stringKey"];
When you read it back, read it as a NSNumber then do:
BOOL savedIsQuiet = [theNumberYouSaved boolValue];
Swift:
To save bool:
UserDefaults.standard.set(true, forKey: "storageKey")
To retrieve the bool:
let boolValue = UserDefaults.standard.bool(forKey: "storageKey")
来源：https://stackoverflow.com/questions/5587505/save-bool-in-nsuserdefaults