字符串变枚举变量

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1、以一个点击按钮播放音效为例

• 引入音频管理文件

	#import <AVFoundation/AVFoundation.h>

2、创建枚举值

    typedef NS_ENUM(NSInteger, VoiceType) {
        VoiceTypeIsWav = 0, // wav
        VoiceTypeIsMp3 = 1, // mp3
        VoiceTypeIsAPE = 2, // ape
        VoiceTypeIsOther = 3 // 其他
    };
    NSString *const VoiceTypeStringMap[] = {
        [VoiceTypeIsWav] = @"wav",
        [VoiceTypeIsMp3] = @"mp3",
        [VoiceTypeIsAPE] = @"ape",
        [VoiceTypeIsOther] = @"Other"
    };

3、播放音频文件方法抽取

    /************ 播放音效 *****************************/
    - (void)playSoundEffect:(NSString *)name withType:(VoiceType)type {
        // 播放扫描二维码的声音
        SystemSoundID soundID;
        NSString *strSoundFile = [[NSBundle mainBundle] pathForResource:name ofType:VoiceTypeStringMap[type]];
        AudioServicesCreateSystemSoundID((__bridge CFURLRef)[NSURL fileURLWithPath:strSoundFile],&soundID);
        AudioServicesPlaySystemSound(soundID);
    }

4、按钮点击播放音效

    /************ 点击开关灯按钮就会调用 *****************************/
    - (void)OpenOrClosedLamp:(UIButton *)button {
        // 播放音效
        [self playSoundEffect:@"btn_press_voice_2" withType:VoiceTypeIsWav];
    }