IOS development: use of system sound services in audio

When developing an application, you sometimes want to add a sound to the application, such as a key tone or a drop-down menu sound, or increase the vibration. It is most convenient to use system sound services to play these short-term sounds.

Enter the topic.

Step 1: Overall understanding

1) required framework: audiotoolbox. Framework

2) related documents: multimedia programming guide

 

Step 2: Usage

 

1) create a systemsoundid object

 

Nsstring * Path = [[nsbundlemainbundle] pathforresource: @ "win"

Oftype: @ "WAV"];

Systemsoundid soundid;

Audioservicescreatesystemsoundid (

(_ Bridgecfurlref) [nsurlfileurlwithpath: path], & soundid );

 

 

2) play audio

 

Audioservicesplayalertsound (soundid); // play audio and vibrate

Audioservicesplaysystemsound (soundid); // only play audio

 

Step 3: Key Points Analysis

1) only play Vibration

 

Audioservicesplaysystemsound (ksystemsoundid_vibrate );

 

2) About _ Bridge

 

Apple uses the core foundation framework to provide APIs for many common components, such as URLs, arrays, and strings, this allows developers to directly write C code to implement relevant functions without using objective-C. Therefore, the cfurlref shown above is functionally equivalent to the nsurl pointer. From ios5, when using arc, by adding _ bridge to a specific name, the developer prompts the compiler to pass an objective-C object to an object under the c api. That's it.