&效果图

我将节拍器View部分分成了四部分，负责处理各自操作。

###View HLRhythmSpotView负责展示节拍数，会根据节拍显示闪烁动画 HLChoiceRhythmView负责切换节拍数 HLChangeSpeedView负责切换频率 HLPlaySwitchView负责播放、暂停、切换频率

###节拍管理类 HLMetronomeAudioManager负责管理节拍的播放、暂停、频率

typedef NS_ENUM(NSInteger, HLMetronomeType) {        HLMetronomeType1V4 =0,     // 1/4    HLMetronomeType2V4,        // 2/4    HLMetronomeType3V4,        // 3/4    HLMetronomeType4V4,        // 4/4    HLMetronomeType3V8,        // 3/8    HLMetronomeType6V8         // 6/8};// 代理@protocol HLMetronomeAudioManagerDelegate 
    
     /** 当前播放音频的总次数（用来处理上部圆View那个显示高亮状态） */- (void)hlMetronomeAudioCurrentTotalNo:(int)currentTotalNo;@end@interface HLMetronomeAudioManager : NSObject+ (instancetype)sharedAudioManager;/** 代理 */@property (nonatomic, weak) id 
     
       delegate;/** 节拍类型 */@property (nonatomic, assign) HLMetronomeType metronomeStat;/** 播放速率，范围40～240 */@property (nonatomic, assign) int rate;/** 播放 */- (void)play;/** 暂停 */- (void)pause;@end复制代码
     
    

每个View通过代理将用户操作事件传回HLMetronomeViewController，由HLMetronomeViewController调用HLMetronomeAudioManager的方法操作节拍音频。

#pragma mark -- 初始化节拍器播放器- (void)initMetronomeAudio{        [HLMetronomeAudioManager sharedAudioManager].delegate = self;    [[HLMetronomeAudioManager sharedAudioManager] setMetronomeStat:HLMetronomeType1V4];    [[HLMetronomeAudioManager sharedAudioManager] setRate:40];    [self.rhythmSpotView updateSpotView:HLMetronomeType1V4];}#pragma mark -- HLChoiceRhythmViewDelegate- (void)hlChangeRhythm:(HLMetronomeType)metronomeStat{        [self.rhythmSpotView updateSpotView:metronomeStat];    [[HLMetronomeAudioManager sharedAudioManager] setMetronomeStat:metronomeStat];}#pragma mark -- HLChangeSpeedViewDelegate- (void)hlChangeSpeed:(int)speed{        [[HLMetronomeAudioManager sharedAudioManager] setRate:speed];}#pragma mark -- HLPlaySwitchViewDelegate- (void)hlPlay{        [[HLMetronomeAudioManager sharedAudioManager] play];}- (void)hlPause{        [[HLMetronomeAudioManager sharedAudioManager] pause];}- (void)hlChangeSpeedWithIsAdd:(BOOL)isAdd speed:(int)speed{        [self.changeSpeedView changeSpeedWithIsAdd:isAdd speed:speed];}#pragma mark -- HLMetronomeAudioManagerDelegate- (void)hlMetronomeAudioCurrentTotalNo:(int)currentTotalNo{        [self.rhythmSpotView updateSpotViewHeightState:currentTotalNo];}复制代码

具体代码可以下载查看