iOS节拍器开发

Demo&效果图

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我将节拍器View部分分成了四部分，负责处理各自操作。

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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 <NSObject>

/** 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 <HLMetronomeAudioManagerDelegate> 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

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];
}

具体代码可以下载Demo查看