UI音乐播放之入门篇AudioSerVicesPlay

#import "RootViewController.h"
#import <AudioToolbox/AudioToolbox.h>
@interface RootViewController ()

@end

@implementation RootViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    [self creatUIButton];
}
-(void)creatUIButton{
    UIButton * btn=[UIButton buttonWithType:UIButtonTypeCustom];
 
    btn.frame=CGRectMake(100, 100, 100, 100);
    btn.backgroundColor=[UIColor grayColor];
    [btn setTitle:@"播放" forState:UIControlStateNormal];
    [btn setTitleColor:[UIColor cyanColor ] forState:UIControlStateNormal];
    [btn addTarget:self action:@selector(pressBtn:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:btn];
}
-(void)pressBtn:(id)sender{
    //1.获取全路径 因为加载音效需要使用CFURLRef 来加载音乐，所以使用能和它相互转换的NSURL 来转换路径
    NSString * pathStr= [[NSBundle mainBundle]pathForResource:@"sound" ofType:@"wav"];
    NSURL * url=[NSURL fileURLWithPath:pathStr];
    
    //2.创建音效ID 一个ID代表一个音效文件
    SystemSoundID SID;
    //3.将音乐文件与ID绑定   将url 强转 将sid与之绑定
    AudioServicesCreateSystemSoundID((__bridge CFURLRef)url, &SID);
    //4.播放音效
    AudioServicesPlayAlertSound(SID);
    //5.当我们需要在音效播放结束时取消该音效则需要使用以下方法 函数名固定
    AudioServicesAddSystemSoundCompletion(SID, nil, nil,finishSound, nil);

}
//该函数为系统方法，函数名，参数固定，不能修改
void finishSound(SystemSoundID SID,void * finish){
  //6.撤销SID
    AudioServicesDisposeSystemSoundID(SID);

}