AVAudioPlayer rate
@property float rate
Discussion of [AVAudioPlayer rate]
This property’s default value of 1.0 provides normal playback rate. The available range is from 0.5 for half-speed playback through 2.0 for double-speed playback.
To set an audio player’s playback rate, you must first enable rate adjustment as described in the enableRate property description.
AVAudioPlayer rate example.
_noticeAudio = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"Rooster-mono" ofType:@"wav"]]
error:nil];;
if ([_noticeAudio respondsToSelector:@selector(setEnableRate:)])
_noticeAudio.enableRate = YES;
if ([_noticeAudio respondsToSelector:@selector(setRate:)])
_noticeAudio.rate = 2.0;
error:nil];;
if ([_noticeAudio respondsToSelector:@selector(setEnableRate:)])
_noticeAudio.enableRate = YES;
if ([_noticeAudio respondsToSelector:@selector(setRate:)])
_noticeAudio.rate = 2.0;
Example of [AVAudioPlayer rate].
player = [[AVAudioPlayer alloc] initWithContentsOfURL:
[NSURL fileURLWithPath:path] error:&err];
player.volume = 0.4f;
player.enableRate=YES;
[player prepareToPlay];
[player setNumberOfLoops:0];
player.rate=2.0f;
[player play];
[NSURL fileURLWithPath:path] error:&err];
player.volume = 0.4f;
player.enableRate=YES;
[player prepareToPlay];
[player setNumberOfLoops:0];
player.rate=2.0f;
[player play];
AVAudioPlayer rate example.
- (void)viewWillAppear:(BOOL)animated {
MyAppDelegate *appDelegate = (myAppDelegate *)[[UIApplication sharedApplication] delegate];
if (appDelegate.myAudioPlayer.rate == 1.0){
UIImage *img = [UIImage imageNamed:@"Pause_BT.png"];
[control setImage:img forState:UIControlStateNormal];
} else if (appDelegate.myAudioPlayer.rate == 0.0) {
UIImage *img = [UIImage imageNamed:@"Play_BT.png"];
[control setImage:img forState:UIControlStateNormal];
}
MyAppDelegate *appDelegate = (myAppDelegate *)[[UIApplication sharedApplication] delegate];
if (appDelegate.myAudioPlayer.rate == 1.0){
UIImage *img = [UIImage imageNamed:@"Pause_BT.png"];
[control setImage:img forState:UIControlStateNormal];
} else if (appDelegate.myAudioPlayer.rate == 0.0) {
UIImage *img = [UIImage imageNamed:@"Play_BT.png"];
[control setImage:img forState:UIControlStateNormal];
}