蘋果手機(jī)部分機(jī)型支持微距拍攝，這些機(jī)型使用超廣角鏡頭可以清晰的拍攝最近距離2厘米的微距照片和視頻。目前支持微距拍照的機(jī)型包括iPhone 13 Pro、iPhone 13 Pro Max、iPhone 14 Pro和iPhone 14 Pro Max、iPhone 15 Pro和iPhone 15 Pro Max。
相應(yīng)的使用自定義相機(jī)的 APP 要實(shí)現(xiàn)微距拍攝的功能，就需要首先搜索到支持微距的攝像設(shè)備，才能獲取到微距拍攝的能力。
簡(jiǎn)而言之，搜索設(shè)備順序可設(shè)為：

@[AVCaptureDeviceTypeBuiltInTripleCamera,AVCaptureDeviceTypeBuiltInDualWideCamera,AVCaptureDeviceTypeBuiltInWideAngleCamera, AVCaptureDeviceTypeBuiltInDualCamera];

詳細(xì)代碼如下：

- (AVCaptureDevice *)getCameraDeviceWithPosition:(AVCaptureDevicePosition )position {
    NSArray<AVCaptureDeviceType> *deviceTypes = @[AVCaptureDeviceTypeBuiltInWideAngleCamera, AVCaptureDeviceTypeBuiltInDualCamera];//設(shè)備類型：廣角鏡頭、雙鏡頭
    if (@available(iOS 13.0, *)) {
        // 數(shù)組成員的順序，決定搜索設(shè)備的順序，不要隨意調(diào)整。
        deviceTypes = @[AVCaptureDeviceTypeBuiltInTripleCamera,AVCaptureDeviceTypeBuiltInDualWideCamera,AVCaptureDeviceTypeBuiltInWideAngleCamera, AVCaptureDeviceTypeBuiltInDualCamera];
    }
    AVCaptureDeviceDiscoverySession *session = [AVCaptureDeviceDiscoverySession discoverySessionWithDeviceTypes:deviceTypes mediaType:AVMediaTypeVideo position:position];
    for (AVCaptureDevice *camera in session.devices) {
        if ([camera position] == position) {
            return camera;
        }
    }
    return nil;
}

修改默認(rèn)焦距

支持微距的設(shè)備，默認(rèn)的焦距是 0.5x，畫面囊括的內(nèi)容較多。期望將焦距改成 1x，與微信保持一致。修改方法如下：

AVCaptureDevice *device = [self getCameraDeviceWithPosition:position];
self.videoInput = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];
if (@available(iOS 13.0, *)) {
    NSArray *factors = [self.videoInput.device virtualDeviceSwitchOverVideoZoomFactors];
    if (factors.count) {
        [self.videoInput.device lockForConfiguration:nil];
        [self.videoInput.device setVideoZoomFactor:2];
        [self.videoInput.device unlockForConfiguration];
    }
}