//檢查前后攝像頭
- (void)cameraBtnAction:(id)sender
{
    BOOL cameraAvailable = [UIImagePickerController isCameraDeviceAvailable:
                                            UIImagePickerControllerCameraDeviceRear];//前
    BOOL frontCameraAvailable = [UIImagePickerController isCameraDeviceAvailable:
                                                    UIImagePickerControllerCameraDeviceFront];//后
}
 
//檢查指南針 CoreLocation.framework  <CoreLocation/CoreLocation.h>
- (void)magnetometerBtnAction:(id)sender
{
    BOOL magnetometerAvailbale = [CLLocationManager headingAvailable];
}
 
//檢查聲音支持 AVFoundation.framework <AVFoundation/AVFoundation.h>
- (bool)audioBtnAction:(id)sender
{
    //返回一個(gè)AVAudioSession實(shí)例   
    AVAudioSession *audioSession = [AVAudioSession sharedInstance];
    BOOL audioAvailable = audioSession.inputAvailable;//bool值。獲取是否支持
}
 
//檢查錄像支持 MobileCoreServices.framework <MobileCoreServices/MobileCoreServices.h>
- (BOOL)isvideoCameraAvailable
{
    //簡(jiǎn)單檢查所有的可用的媒體資源類型，然后檢查返回的數(shù)組，
    //如果其中包含了kUTTypeMovie的NSString類型對(duì)象，就證明攝像頭支持錄像
    UIImagePickerController *picker = [[UIImagePickerController alloc]init];
    //返回所支持的media的類型數(shù)組
    NSArray *sourceTypes = [UIImagePickerController availableMediaTypesForSourceType:picker.sourceType];
    [picker release];
    if (![sourceTypes containsObject:(NSString *)kUTTypeMovie]) {//containsObject確定數(shù)組中是否包含后面的對(duì)象
        return NO;
    }
    return YES;
}
 
//檢查陀螺儀可用 CoreMotion.framework <CoreMotion/CoreMotion.h>
- (BOOL) isGyroscopeAvailable
{
#ifdef __IPHONE_4_0//4.0之后才有
    CMMotionManager *motionManager = [[CMMotionManager alloc]init];
    BOOL gyroscopeAvailable = motionManager.gyroAvailable;
    [motionManager release];
    return gyroscopeAvailable;
#else
    return NO;
#endif
}

標(biāo)簽： 媒體

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