版權聲明：本文為部落客原創文章，未經部落客允許不得轉載。
前言：最近研究了一下語音識别，從百度語音識别到訊飛語音識别；首先說一下個人針對兩者的看法，訊飛毫無疑問比較專業，識别率也很高真對語音識别是比較精準的，但是很多開發者和我一樣期望離線識别，而訊飛離線是收費的；請求次數來講，兩者都可以申請高配額，真對使用者較多的幾乎都一樣。基于免費并且支援離線我選擇了百度離線語音識别。比較簡單，ui設計多一點，下面寫一下教程：
1.首先：需要的庫
2.我是自定義的ui是以以功能實作為主（頭檔案）
// 頭檔案
#import "bdvrcustomrecognitonviewcontroller.h"
#import "bdvrclientuimanager.h"
#import "wbvoicerecordhud.h"
#import "bdvrviewcontroller.h"
#import "myviewcontroller.h"
#import "bdvrsconfig.h"
3.需要知道的功能：能用到的如下：
//－－－－－－－－－－－－－－－－－－－類方法－－－－－－－－－－－－－－－－－－－－－－－－
// 建立語音識别客戶對像，該對像是個單例
+ (bdvoicerecognitionclient *)sharedinstance;
// 釋放語音識别用戶端對像
+ (void)releaseinstance;
//－－－－－－－－－－－－－－－－－－－識别方法－－－－－－－－－－－－－－－－－－－－－－－
// 判斷是否可以錄音
- (bool)iscanrecorder;
// 開始語音識别，需要實作mvoicerecognitionclientdelegate代理方法，并傳入實作對像監聽事件
// 傳回值參考 tvoicerecognitionstartworkresult
- (int)startvoicerecognition:(id<mvoicerecognitionclientdelegate>)adelegate;
// 說完了，使用者主動完成錄音時調用
- (void)speakfinish;
// 結束本次語音識别
- (void)stopvoicerecognition;
/**
* @brief 擷取目前識别的采樣率
*
* @return 采樣率(16000/8000)
*/
- (int)getcurrentsamplerate;
* @brief 得到目前識别模式(deprecated)
* @return 目前識别模式
- (int)getcurrentvoicerecognitionmode __attribute__((deprecated));
* @brief 設定目前識别模式(deprecated)，請使用-(void)setproperty:(tbdvoicerecognitionproperty)property;
* @param 識别模式
* @return 是否設定成功
- (void)setcurrentvoicerecognitionmode:(int)amode __attribute__((deprecated));
// 設定識别類型
- (void)setproperty:(tbdvoicerecognitionproperty)property __attribute__((deprecated));
// 擷取目前識别類型
- (int)getrecognitionproperty __attribute__((deprecated));
// 設定識别類型清單, 除evoicerecognitionpropertyinput和evoicerecognitionpropertysong外
// 可以識别類型複合
- (void)setpropertylist: (nsarray*)prop_list;
// cityid僅對evoicerecognitionpropertymap識别類型有效
- (void)setcityid: (nsinteger)cityid;
// 擷取目前識别類型清單
- (nsarray*)getrecognitionpropertylist;
//－－－－－－－－－－－－－－－－－－－提示音－－－－－－－－－－－－－－－－－－－－－－－
// 播放提示音，預設為播放,錄音開始，錄音結束提示音
// bdvoicerecognitionclientresources/tone
// record_start.caf 錄音開始聲音檔案
// record_end.caf 錄音結束聲音檔案
// 聲音資源需要加到項目工程裡，使用者可替換資源檔案，檔案名不可以變，建音提示音不宜過長，0。5秒左右。
// atone 取值參考 tvoicerecognitionplaytones，如沒有找到檔案，則傳回ＮＯ
- (bool)setplaytone:(int)atone isplay:(bool)aisplay;
4.錄音按鈕相關動畫（我自定義的，大家可以借鑒）
// 錄音按鈕相關
@property (nonatomic, weak, readonly) uibutton *holddownbutton;// 說話按鈕
* 是否取消錄音
@property (nonatomic, assign, readwrite) bool iscancelled;
* 是否正在錄音
@property (nonatomic, assign, readwrite) bool isrecording;
* 當錄音按鈕被按下所觸發的事件，這時候是開始錄音
- (void)holddownbuttontouchdown;
* 當手指在錄音按鈕範圍之外離開螢幕所觸發的事件，這時候是取消錄音
- (void)holddownbuttontouchupoutside;
* 當手指在錄音按鈕範圍之内離開螢幕所觸發的事件，這時候是完成錄音
- (void)holddownbuttontouchupinside;
* 當手指滑動到錄音按鈕的範圍之外所觸發的事件
- (void)holddowndragoutside;
5.初始化系統ui
#pragma mark - layout subviews ui
* 根據正常顯示和高亮狀态建立一個按鈕對象
* @param image 正常顯示圖
* @param hlimage 高亮顯示圖
* @return 傳回按鈕對象
- (uibutton *)createbuttonwithimage:(uiimage *)image hlimage:(uiimage *)hlimage ;
- (void)holddowndraginside;
- (void)createinitview; // 建立初始化界面，播放提示音時會用到
- (void)createrecordview; // 建立錄音界面
- (void)createrecognitionview; // 建立識别界面
- (void)createerrorviewwitherrortype:(int)astatus; // 在識别view中顯示詳細錯誤資訊
- (void)createrunlogwithstatus:(int)astatus; // 在狀态view中顯示詳細狀态資訊
- (void)finishrecord:(id)sender; // 使用者點選完成動作
- (void)cancel:(id)sender; // 使用者點選取消動作
- (void)startvoicelevelmetertimer;
- (void)freevoicelevelmetertimertimer;
6.最重要的部分
// 錄音完成
[[bdvoicerecognitionclient sharedinstance] speakfinish];
// 取消錄音
[[bdvoicerecognitionclient sharedinstance] stopvoicerecognition];
7.兩個代理方法
- (void)voicerecognitionclientworkstatus:(int)astatus obj:(id)aobj
{
switch (astatus)
{
case evoicerecognitionclientworkstatusflushdata: // 連續上屏中間結果
{
nsstring *text = [aobj objectatindex:0];
if ([text length] > 0)
{
// [clientsampleviewcontroller logouttocontinusmanualresut:text];
uilabel *clientworkstatusflushlabel = [[uilabel alloc]initwithframe:cgrectmake(kscreenwidth/2 - 100,64,200,60)];
clientworkstatusflushlabel.text = text;
clientworkstatusflushlabel.textalignment = nstextalignmentcenter;
clientworkstatusflushlabel.font = [uifont systemfontofsize:18.0f];
clientworkstatusflushlabel.numberoflines = 0;
clientworkstatusflushlabel.backgroundcolor = [uicolor whitecolor];
[self.view addsubview:clientworkstatusflushlabel];
}
break;
}
case evoicerecognitionclientworkstatusfinish: // 識别正常完成并獲得結果
[self createrunlogwithstatus:astatus];
if ([[bdvoicerecognitionclient sharedinstance] getrecognitionproperty] != evoicerecognitionpropertyinput)
// 搜尋模式下的結果為數組，示例為
// ["公園", "公元"]
nsmutablearray *audioresultdata = (nsmutablearray *)aobj;
nsmutablestring *tmpstring = [[nsmutablestring alloc] initwithstring:@""];
for (int i=0; i < [audioresultdata count]; i++)
{
[tmpstring appendformat:@"%@\r\n",[audioresultdata objectatindex:i]];
}
clientsampleviewcontroller.resultview.text = nil;
[clientsampleviewcontroller logouttomanualresut:tmpstring];
else
nsstring *tmpstring = [[bdvrsconfig sharedinstance] composeinputmoderesult:aobj];
[clientsampleviewcontroller logouttocontinusmanualresut:tmpstring];
if (self.view.superview)
[self.view removefromsuperview];
case evoicerecognitionclientworkstatusreceivedata:
// 此狀态隻有在輸入模式下使用
// 輸入模式下的結果為帶置信度的結果，示例如下：
// [
// [
// {
// "百度" = "0.6055192947387695";
// },
// "擺渡" = "0.3625582158565521";
// ]
// "一下" = "0.7665404081344604";
// }
// ],
// ]
//暫時關掉 -- 否則影響跳轉結果
// nsstring *tmpstring = [[bdvrsconfig sharedinstance] composeinputmoderesult:aobj];
// [clientsampleviewcontroller logouttocontinusmanualresut:tmpstring];
case evoicerecognitionclientworkstatusend: // 使用者說話完成，等待伺服器傳回識别結果
if ([bdvrsconfig sharedinstance].voicelevelmeter)
[self freevoicelevelmetertimertimer];
[self createrecognitionview];
case evoicerecognitionclientworkstatuscancel:
{
if ([bdvrsconfig sharedinstance].voicelevelmeter)
[self createrunlogwithstatus:astatus];
if (self.view.superview)
case evoicerecognitionclientworkstatusstartworking: // 識别庫開始識别工作，使用者可以說話
if ([bdvrsconfig sharedinstance].playstartmusicswitch) // 如果播放了提示音，此時再給使用者提示可以說話
[self createrecordview];
if ([bdvrsconfig sharedinstance].voicelevelmeter) // 開啟語音音量監聽
[self startvoicelevelmetertimer];
[self createrunlogwithstatus:astatus];
case evoicerecognitionclientworkstatusnone:
case evoicerecognitionclientworkplaystarttone:
case evoicerecognitionclientworkplaystarttonefinish:
case evoicerecognitionclientworkstatusstart:
case evoicerecognitionclientworkplayendtonefinish:
case evoicerecognitionclientworkplayendtone:
case evoicerecognitionclientworkstatusnewrecorddata:
default:
}
}
- (void)voicerecognitionclientnetworkstatus:(int) astatus
switch (astatus)
case evoicerecognitionclientnetworkstatusstart:
{
[[uiapplication sharedapplication] setnetworkactivityindicatorvisible:yes];
break;
case evoicerecognitionclientnetworkstatusend:
[[uiapplication sharedapplication] setnetworkactivityindicatorvisible:no];
}
8.錄音按鈕的一些操作
#pragma mark ------ 關于按鈕操作的一些事情-------
- (void)holddownbuttontouchdown {
// 開始動畫
_displaylink = [cadisplaylink displaylinkwithtarget:self selector:@selector(delayanimation)];
_displaylink.frameinterval = 40;
[_displaylink addtorunloop:[nsrunloop currentrunloop] formode:nsdefaultrunloopmode];
self.iscancelled = no;
self.isrecording = no;
// 開始語音識别功能，之前必須實作mvoicerecognitionclientdelegate協定中的voicerecognitionclientworkstatus:obj方法
int startstatus = -1;
startstatus = [[bdvoicerecognitionclient sharedinstance] startvoicerecognition:self];
if (startstatus != evoicerecognitionstartworking) // 建立失敗則報告錯誤
nsstring *statusstring = [nsstring stringwithformat:@"%d",startstatus];
[self performselector:@selector(firststarterror:) withobject:statusstring afterdelay:0.3]; // 延遲0.3秒，以便能在出錯時正常删除view
return;
// "按住說話－松開搜尋"提示
[voiceimagestr removefromsuperview];
voiceimagestr = [[uiimageview alloc]initwithframe:cgrectmake(kscreenwidth/2 - 40, kscreenheight - 153, 80, 33)];
voiceimagestr.backgroundcolor = [uicolor colorwithpatternimage:[uiimage imagenamed:@"searchvoice"]];
[self.view addsubview:voiceimagestr];
- (void)holddownbuttontouchupoutside {
// 結束動畫
[self.view.layer removeallanimations];
[_displaylink invalidate];
_displaylink = nil;
// 取消錄音
[[bdvoicerecognitionclient sharedinstance] stopvoicerecognition];
if (self.view.superview)
[self.view removefromsuperview];
- (void)holddownbuttontouchupinside {
[[bdvoicerecognitionclient sharedinstance] speakfinish];
- (void)holddowndragoutside {
//如果已經開始錄音了, 才需要做拖曳出去的動作, 否則隻要切換 iscancelled, 不讓錄音開始.
if (self.isrecording) {
// if ([self.delegate respondstoselector:@selector(diddragoutsideaction)]) {
// [self.delegate diddragoutsideaction];
// }
} else {
self.iscancelled = yes;
- (uibutton *)createbuttonwithimage:(uiimage *)image hlimage:(uiimage *)hlimage {
uibutton *button = [[uibutton alloc] initwithframe:cgrectmake(kscreenwidth/2 -36, kscreenheight - 120, 72, 72)];
if (image)
[button setbackgroundimage:image forstate:uicontrolstatenormal];
if (hlimage)
[button setbackgroundimage:hlimage forstate:uicontrolstatehighlighted];
return button;
#pragma mark ----------- 動畫部分 -----------
- (void)startanimation
calayer *layer = [[calayer alloc] init];
layer.cornerradius = [uiscreen mainscreen].bounds.size.width/2;
layer.frame = cgrectmake(0, 0, layer.cornerradius * 2, layer.cornerradius * 2);
layer.position = cgpointmake([uiscreen mainscreen].bounds.size.width/2,[uiscreen mainscreen].bounds.size.height - 84);
// self.view.layer.position;
uicolor *color = [uicolor colorwithred:arc4random()%10*0.1 green:arc4random()%10*0.1 blue:arc4random()%10*0.1 alpha:1];
layer.backgroundcolor = color.cgcolor;
[self.view.layer addsublayer:layer];
camediatimingfunction *defaultcurve = [camediatimingfunction functionwithname:kcamediatimingfunctiondefault];
_animationgroup = [caanimationgroup animation];
_animationgroup.delegate = self;
_animationgroup.duration = 2;
_animationgroup.removedoncompletion = yes;
_animationgroup.timingfunction = defaultcurve;
cabasicanimation *scaleanimation = [cabasicanimation animationwithkeypath:@"transform.scale.xy"];
scaleanimation.fromvalue = @0.0;
scaleanimation.tovalue = @1.0;
scaleanimation.duration = 2;
cakeyframeanimation *opencityanimation = [cakeyframeanimation animationwithkeypath:@"opacity"];
opencityanimation.duration = 2;
opencityanimation.values = @[@0.8,@0.4,@0];
opencityanimation.keytimes = @[@0,@0.5,@1];
opencityanimation.removedoncompletion = yes;
nsarray *animations = @[scaleanimation,opencityanimation];
_animationgroup.animations = animations;
[layer addanimation:_animationgroup forkey:nil];
[self performselector:@selector(removelayer:) withobject:layer afterdelay:1.5];
- (void)removelayer:(calayer *)layer
[layer removefromsuperlayer];
- (void)delayanimation
[self startanimation];
完成以上操作，就大功告成了！
溫馨提示：
1.由于是語音識别，需要用到麥克風相關權限，模拟器會爆12個錯誤，使用真機可以解決；
2.涉及到授權檔案相關并不複雜，工程bundle identifier隻需要設定百度的離線授權一緻即可，如下圖：
最終效果如下：
有不懂或不明白的地方可以微網誌聯系我：