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音效:通俗的说是短音频,音频文件必须满足下面的条件
1、播放的时间不能超过30秒
2、数据必须是 PCM或者IMA4流格式
3、必须被打包成下面三个格式之一：Core Audio Format (.caf), Waveform audio (.wav), 或者 Audio Interchange File (.aiff)
1.引入框架
1 #import <AudioToolbox/AudioToolbox.h>
2.播放音效
1 - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event 2 { 3 // 声明SoundID 4 SystemSoundID soundID ; 5 self.soundID = soundID; 6 // 获取音效文件的url 7 NSURL *url = [[NSBundle mainBundle] URLForResource:@"m_10.wav" withExtension:nil]; 8 // 根据url创建 9 AudioServicesCreateSystemSoundID((__bridge CFURLRef)url, &soundID); 10 AudioServicesPlaySystemSound(soundID); 11 };
记忆技巧:
1.播放音效的核心代码,申明音效ID,然后播放音效
1 SystemSoundID soundID ; 2 AudioServicesPlaySystemSound(soundID);
2.用下面这句给soundID赋值
1 AudioServicesCreateSystemSoundID((__bridge CFURLRef)url, &soundID);
3.赋值语句有2个参数,一个是音效文件资源路径,另外一个就是之前申明soundID了
1 NSURL *url = [[NSBundle mainBundle] URLForResource:@"m_10.wav" withExtension:nil];
3.播放完音效后,应该销毁
1 - (void)didReceiveMemoryWarning 2 { 3 [super didReceiveMemoryWarning]; 4 AudioServicesDisposeSystemSoundID(self.soundID); 5 self.soundID = 0; 6 }
重构上述代码,提供一个播放音效的工具类,重构代码来自MJ老师
1.工具类的.h文件
1 #import <Foundation/Foundation.h> 2 3 @interface MJAudioTool : NSObject 4 5 /** 6 * 播放音效 7 * 8 * @param filename 音效文件名 9 */ 10 + (void)playSound:(NSString *)filename; 11 12 /** 13 * 销毁音效 14 * 15 * @param filename 音效文件名 16 */ 17 + (void)disposeSound:(NSString *)filename; 18 @end
2.工具类.m文件
1 #import "MJAudioTool.h" 2 #import <AudioToolbox/AudioToolbox.h> 3 4 @implementation MJAudioTool 5 6 // 字典: filename作为key, soundID作为value 7 // 存放所有的音频ID 8 static NSMutableDictionary *_soundIDDict; 9 + (void)initialize 10 { 11 _soundIDDict = [NSMutableDictionary dictionary]; 12 } 13 14 + (void)playSound:(NSString *)filename 15 { 16 if (!filename) return; 17 18 // 1.从字典中取出soundID 19 SystemSoundID soundID = [_soundIDDict[filename] unsignedLongValue]; 20 if (!soundID) { // 创建 21 // 加载音效文件 22 NSURL *url = [[NSBundle mainBundle] URLForResource:filename withExtension:nil]; 23 24 if (!url) return; 25 26 // 创建音效ID 27 AudioServicesCreateSystemSoundID((__bridge CFURLRef)url, &soundID); 28 29 // 放入字典 30 _soundIDDict[filename] = @(soundID); 31 } 32 33 // 2.播放 34 AudioServicesPlaySystemSound(soundID); 35 } 36 37 + (void)disposeSound:(NSString *)filename 38 { 39 if (!filename) return; 40 41 SystemSoundID soundID = [_soundIDDict[filename] unsignedLongValue]; 42 if (soundID) { 43 // 销毁音效ID 44 AudioServicesDisposeSystemSoundID(soundID); 45 46 // 从字典中移除 47 [_soundIDDict removeObjectForKey:filename]; 48 } 49 } 50 51 @end
3.控制器的.m文件
播放音效
1 - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event 2 { 3 [MJAudioTool playSound:@"buyao.wav"]; 4 [MJAudioTool playSound:@"m_03.wav"]; 5 }
销毁音效
1 - (void)didReceiveMemoryWarning 2 { 3 [super didReceiveMemoryWarning]; 4 5 [MJAudioTool disposeSound:@"m_03.wav"]; 6 [MJAudioTool disposeSound:@"buyao.wav"]; 7 }
标签：style blog ar io color os sp for on
原文地址：http://www.cnblogs.com/oumygade/p/4166504.html
