判断设备是否有相机、闪光灯

if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
        NSLog(@"有相机");
    }
    
    if ([UIImagePickerController isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceRear]) {
        NSLog(@"背面有相机");
    }
    if ([UIImagePickerController isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceFront]) {
        NSLog(@"前面有相机");
    }
    if ([UIImagePickerController isFlashAvailableForCameraDevice:UIImagePickerControllerCameraDeviceRear]) {
        NSLog(@"后面有闪光灯");
    }
    if ([UIImagePickerController isFlashAvailableForCameraDevice:UIImagePickerControllerCameraDeviceFront]) {
        NSLog(@"前面有闪光灯");
    }