Lan Yi iOS Learning audio playback

Prepare song data

NSString *path = [[NSBundle mainbundle] pathforresource:@ "Alan Walker-fade.mp3" oftype:nil];

NSData *musicdata = [NSData Datawithcontentsoffile:path];

Initializing the audio player (based on NSData initialization)

Nserror *errormsg = nil;

Self.player = [[Avaudioplayer alloc] Initwithdata:musicdata error:&errormsg];

ErrorMsg = = nil?: NSLog (@ "%@", errormsg);

self.player.meteringEnabled = YES; Enable level

Self.player.enableRate = YES; Enable playback of variable speed

Self.player.numberOfLoops =-1; 0 plays only once, 1 infinite loops, positive numbers are played several times

NSLog (@ "%@", self.player.settings); Show audio file most basic information

Timer Update Play progress bar

[Nstimer scheduledtimerwithtimeinterval:.1

Target:self

Selector: @selector (Updateprogressview)

Userinfo:nil

;

Self.slid.minimumValu Repeats:yes];

To reset the initial value of a Slider

Self.slid.value = 0e = 0;

Self.slid.maximumValue = self.player.duration;

}

-(void) Updateprogressview {

Progress's progress range is 0~1.

Current Playback progress = Current broadcast-put Time ÷ total time

Duration Total Audio Time

CurrentTime Current Playback time

self.jindu.progress = self.player.currenttime/self.player.duration;

Level

[Self.player Updatemeters];

[Self.pv0 setprogress: ([self.player averagepowerforchannel:0] + +)/animated:yes];

[Self.pv1 setprogress: ([self.player averagepowerforchannel:1] + +)/animated:yes];

}

-(Ibaction) Bofang: (UIButton *) Sender {

Delay playback (current device playback time + delay time)

[Self.player Playattime:[self.player CurrentTime] + 10];

One button for pause, play function

if (self.player.playing) {

[Self.player pause];

[Sender setimage:[uiimage imagenamed:@ "1"] forstate:uicontrolstatenormal];

} else {

[Self.player play];

[Sender Setimage:[uiimage imagenamed:@ "2"] forstate:uicontrolstatenormal];

}

}

-(Ibaction) SLI: (UISlider *) Sender {

Self.player.volume = Sender.value; 0~1, after 1 is equivalent to gain, the sound quality drops

Self.player.rate = Sender.value; 0.5~2, playback speed factor, 1 is the default (original speed)

Self.player.currentTime = Sender.value;

Self.player.rate = 50;

----------------------Functional Partitioning-----------------------------

Self.player.volume = Sender.value; Volume control [0,1], after 1 is equivalent to the gain, the sound quality drops, the negative will become maximum

Self.player.rate = Sender.value; Play Speed factor (0,+∞], need to be greater than 0, 0~1 is spin down, 1~+∞ is accelerated. Corresponds to the maximum value of the Slidert to be initialized Gaiyixia

Self.player.currentTime = Sender.value; Current playback time (modify playback progress via Slider)

}

Lan Yi iOS Learning audio playback