Demo&效果圖

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我將節(jié)拍器View部分分成了四部分猎贴，負責處理各自操作宫屠。

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View

HLRhythmSpotView負責展示節(jié)拍數(shù)黑低，會根據(jù)節(jié)拍顯示閃爍動畫
HLChoiceRhythmView負責切換節(jié)拍數(shù)
HLChangeSpeedView負責切換頻率
HLPlaySwitchView負責播放鳍侣、暫停、切換頻率

節(jié)拍管理類

HLMetronomeAudioManager負責管理節(jié)拍的播放应民、暫停话原、頻率

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 <NSObject>

/** 當前播放音頻的總次數(shù)（用來處理上部圓View那個顯示高亮狀態(tài)） */
- (void)hlMetronomeAudioCurrentTotalNo:(int)currentTotalNo;

@end

@interface HLMetronomeAudioManager : NSObject

+ (instancetype)sharedAudioManager;

/** 代理 */
@property (nonatomic, weak) id <HLMetronomeAudioManagerDelegate> delegate;

/** 節(jié)拍類型 */
@property (nonatomic, assign) HLMetronomeType metronomeStat;

/** 播放速率夕吻，范圍40～240 */
@property (nonatomic, assign) int rate;

/** 播放 */
- (void)play;

/** 暫停 */
- (void)pause;

@end

每個View通過代理將用戶操作事件傳回HLMetronomeViewController，由HLMetronomeViewController調(diào)用HLMetronomeAudioManager的方法操作節(jié)拍音頻繁仁。

#pragma mark -- 初始化節(jié)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];
}

具體代碼可以下載Demo查看