简单的使用系统功能实现语音播报功能

调用方法

//一、播放内容用中文
[[SpeechSynthesizer sharedSpeechSynthesizer] speakString:@"Leo is a handsome Boy~"];

//二、播放内容用中文
[[[SpeechSynthesizer alloc] init] speakString:@"Leo is a handsome Boy~"];

H文件

#import <UIKit/UIKit.h>

/**
 *  iOS7及以上版本可以使用 AVSpeechSynthesizer 合成语音
 *
 *  或者采用"科大讯飞"等第三方的语音合成服务
 */
@interface SpeechSynthesizer : NSObject

+ (instancetype)sharedSpeechSynthesizer;

- (BOOL)isSpeaking;

- (void)stopSpeak;  

- (void)speakString:(NSString *)string;

@end

M文件

#import "SpeechSynthesizer.h"
#import <AVFoundation/AVFoundation.h>

@interface SpeechSynthesizer () <AVSpeechSynthesizerDelegate>

@property (nonatomic, strong, readwrite) AVSpeechSynthesizer *speechSynthesizer;

@end

@implementation SpeechSynthesizer

+ (instancetype)sharedSpeechSynthesizer
{
    static id sharedInstance = nil;

    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        sharedInstance = [[SpeechSynthesizer alloc] init];
    });
    return sharedInstance;
}

- (instancetype)init
{
    if (self = [super init])
    {
        [self buildSpeechSynthesizer];
    }
    return self;
}

- (void)buildSpeechSynthesizer
{
    if ([[[UIDevice currentDevice] systemVersion] floatValue] < 7.0)
    {
        return;
    }

    //简单配置一个AVAudioSession以便可以在后台播放声音，更多细节参考AVFoundation官方文档
    AVAudioSession *session = [AVAudioSession sharedInstance];
    [session setCategory:AVAudioSessionCategoryPlayback withOptions:AVAudioSessionCategoryOptionDuckOthers error:NULL];

    self.speechSynthesizer = [[AVSpeechSynthesizer alloc] init];
    self.speechSynthesizer.delegate = self;
}

- (BOOL)isSpeaking
{
    return self.speechSynthesizer.isSpeaking;
}

- (void)stopSpeak
{
    if (self.speechSynthesizer)
    {
        [self.speechSynthesizer stopSpeakingAtBoundary:AVSpeechBoundaryImmediate];
    }
}

- (void)speakString:(NSString *)string
{
    if (self.speechSynthesizer)
    {
        //设置播放语音的内容
        AVSpeechUtterance *aUtterance = [AVSpeechUtterance speechUtteranceWithString:string];
        //设置播放的语言
        [aUtterance setVoice:[AVSpeechSynthesisVoice voiceWithLanguage:@"zh-CN"]];
    
        //iOS语音合成在iOS8及以下版本系统上语速异常
        if ([[[UIDevice currentDevice] systemVersion] floatValue] < 8.0)
        {
            aUtterance.rate = 0.25;//iOS7设置为0.25
        }
        else if ([[[UIDevice currentDevice] systemVersion] floatValue] < 9.0)
        {
            aUtterance.rate = 0.15;//iOS8设置为0.15
        }
    
        if ([self.speechSynthesizer isSpeaking])
        {
            [self.speechSynthesizer stopSpeakingAtBoundary:AVSpeechBoundaryWord];
        }
    
        //开始播放语音
        [self.speechSynthesizer speakUtterance:aUtterance];
    }
}

@end

慢慢来，一步一个巴掌印。。。。。