Add iOS 7 code to iOS 6 project

Question

I Understand TTS is only available in iOS 7 Before down vote please read through.

One of my customers want to add text-to-speech feature to existing project based on iOS 6. I understand in iOS 7 we have built in TTS so I want to use it.

The following code is working fine when project is based on iOS 7.

AVSpeechSynthesizer *synthesizer = [[AVSpeechSynthesizer alloc] init];
AVSpeechUtterance *utterance = [AVSpeechUtterance speechUtteranceWithString:@"Please raise my salary!!!"];
[synthesizer speakUtterance:utterance];

But I am not able to add this code to existing project based on iOS 6.

I am using this thread way. Am I missing something? Or this built in TTS is something different stuff?

Guys, he wants to include the code in the application, but make in _inaccessible_ when running iOS 6.0 — cjwirth, Dec 11 '13 at 12:53
The best you can do is test if the feature is available and only use it if it is. — Hot Licks, Dec 11 '13 at 12:53
The question you reference discusses several different techniques. It's impossible for us to guess which ones you tried. — Hot Licks, Dec 11 '13 at 12:55
@HotLicks I tried __IPHONE_OS_VERSION_MAX_ALLOWED, __IPHONE_OS_VERSION_MIN_REQUIRED, NSClassFromString, if([BLAH class]) — brianLikeApple, Dec 11 '13 at 12:56
@brianLikeApple _What_ isn't working? Is it building? Is it running, but crashing? Where is your failure? — cjwirth, Dec 11 '13 at 12:57
That will not let you compile a single app that can run in either either environment. You need to use a runtime test. — Hot Licks, Dec 11 '13 at 12:57
If it's not even building, my guess is that you are building with the iOS 6 SDK. You can change that in the build settings. You will still need to do runtime checks to see if the functionality exists before using it. — cjwirth, Dec 11 '13 at 12:58
@otiose I am getting error saying AVSpeechSynthesizer is not for armv7s. — brianLikeApple, Dec 11 '13 at 13:00
@brianLikeApple Are you linking AVFoundation in your project? — cjwirth, Dec 11 '13 at 13:05
When you get an error message, copy/paste the *exact* error message, and, where appropriate, include the section of code that the error refers to. (In the compile error listing, right-mouse-click on the error message and select "show in log" to get a version of the message you can copy.) — Hot Licks, Dec 11 '13 at 13:29
@HotLicks sorry mate. otiose did find my problem. I am hoping give you up vote if you answer a question : ) It is my stupid fault. Sorry about that. — brianLikeApple, Dec 11 '13 at 13:56

score 2 · Accepted Answer · answered Dec 11 '13 at 13:15

Since you are trying to run code that cannot run on iOS 6, you need to have runtime checks that will make sure that you can run the code you are trying to run. A quick way to do this is to check if the class is available:

if([AVSpeechSynthesizer class]) {
    AVSpeechSynthesizer *synthesizer = [[AVSpeechSynthesizer alloc] init];
    AVSpeechUtterance *utterance = [AVSpeechUtterance speechUtteranceWithString:@"Please raise my salary!!!"];
    [synthesizer speakUtterance:utterance];
} else {
    // Feature not available, do something else
}

You will need to do this regardless of whether or not the code compiles or not.

If your code is not even compiling correctly, then there are a few things you can check:

Is your base SDK set to iOS 6.0?
AVSpeechSynthesizer is part of AVFoundation - are you linking your project to it?

opps!, Yes, you are right. I did #import but forget to add AVFoundation link to my project. — brianLikeApple, Dec 11 '13 at 13:55

Yunus Nedim Mehel · Answer 2 · 2013-12-11T13:03:11.513

1

if ( [[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0f ){

    AVSpeechSynthesizer *synthesizer = [[AVSpeechSynthesizer alloc] init];
    AVSpeechUtterance *utterance = [AVSpeechUtterance speechUtteranceWithString:@"Please raise my salary!!!"];
    [synthesizer speakUtterance:utterance];
}
//And an else block if you have a back-up plan

edited Dec 11 '13 at 13:03

answered Dec 11 '13 at 13:00

Yunus Nedim Mehel

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Have you tried it on your side? Yes, I know. It doesn't work from my side. otherwise I wouldn't ask such stupid questions. – brianLikeApple Dec 11 '13 at 13:06
2

This code cannot work, because AVSpeechSynthesizer requires iOS7 (https://developer.apple.com/library/IOs/documentation/AVFoundation/Reference/AVSpeechSynthesizer_Ref/Reference/Reference.html). This will only fix compile error on iOS6. You need to find an alternative way for OS's older than 7. – Yunus Nedim Mehel Dec 11 '13 at 13:08
Your code is correct. So I give you up vote. But otiose found the point so I gave him accepted answer : ) – brianLikeApple Dec 11 '13 at 13:54

Add iOS 7 code to iOS 6 project

2 Answers2