播放音乐并调节音量

引系统的头文件 

#import <AVFoundation/AVFoundation.h>

1.两条属性

@property(nonatomic,retain)UIStepper *stepper;

@property(nonatomic,retain)AVAudioPlayer *play;

2.播放

    NSString *path=[[NSBundlemainBundle]pathForResource:@"盛夏光年"ofType:@"mp3"];

    self.play =[[AVAudioPlayeralloc]initWithContentsOfURL:[NSURLfileURLWithPath:path]error:nil];

    [self.playplay];

    [self.playrelease];

//创建一个stepper

    self.stepper=[[UIStepperalloc]initWithFrame:CGRectMake(100,100,100, 100)];

    [self.viewaddSubview:self.stepper];

    self.stepper.stepValue=2;

    [self.stepperaddTarget:selfaction:@selector(stepAction:)forControlEvents:UIControlEventValueChanged];

对应的实现方法

-(void)stepAction:(UIStepper *)stepper

{

   NSLog(@"%g",self.stepper.value);

    //调播放音量

   self.play.volume=self.stepper.value;

}