自定義相機(jī)代碼,網(wǎng)上很多,這篇文章主要處理實(shí)際開(kāi)發(fā)中需要做調(diào)整地方遇到的一些困難.1-3這個(gè)問(wèn)題屬于自己流程問(wèn)題才會(huì)遇到的,4-5你們可能會(huì)遇到
1.圖片旋轉(zhuǎn)的問(wèn)題.
2.橫向預(yù)覽的問(wèn)題.
3.豎屏拍照的問(wèn)題.
4.圖片比例,后臺(tái)要求我必須使用1.3比例上傳.
5.自定義相機(jī),要和系統(tǒng)拍照效果一致.

先看下成品的gif

Untitled.gif

下面逐一處理上面的問(wèn)題,最后會(huì)附上demo.
1.解決方案:網(wǎng)上圖片旋轉(zhuǎn)的方法有很多,我推薦簡(jiǎn)書(shū)的這篇文章作為參考.
2.解決方案:由于我圖片預(yù)覽使用了一個(gè)新的Controller,承載圖片imageView的渲染模式需要改為UIImageRenderingModeAlwaysOriginal,不然橫屏拍照預(yù)覽有問(wèn)題.

image.contentMode =UIImageRenderingModeAlwaysOriginal;

3.解決方案:還是因?yàn)榈诙l預(yù)覽頁(yè)面的設(shè)置,導(dǎo)致豎屏拍照傳到預(yù)覽頁(yè)面之后填充不滿,具體代碼

_backImage =image;
 if (_backImage.image.size.width >_backImage.image.size.height) {
        
    }else{
        self.backImage.image = [self.backImage.image rotate:UIImageOrientationRight];
    }
    [self.view sendSubviewToBack:self.backImage];

4.解決方案:這個(gè)功能差點(diǎn)讓我放棄自定義相機(jī),如果我截取圖片或者強(qiáng)制把圖片比例轉(zhuǎn)成1.3,圖片要么缺失,要么變形.最后查找系統(tǒng)api找到了想要的比例,設(shè)置SessionPreset，設(shè)置輸出輸出流的比特率或者說(shuō)畫(huà)面質(zhì)量

     *NSString *const AVCaptureSessionPresetPhoto;//最高質(zhì)量3264*2448 1.3
     *NSString *const AVCaptureSessionPresetHigh;//1.7
     *NSString *const AVCaptureSessionPresetMedium;//1.7
     *NSString *const AVCaptureSessionPresetLow;//2.7
     *NSString *const AVCaptureSessionPreset640x480;//1.3 極其模糊
     *NSString *const AVCaptureSessionPreset1280x720;//1.7
     *NSString *const AVCaptureSessionPreset1920x1080;//1.7
     *NSString *const AVCaptureSessionPresetiFrame960x540;//1.7
     *NSString *const AVCaptureSessionPresetiFrame1280x720;//1.7
     *NSString *const AVCaptureSessionPresetInputPriority;
    //由以上參數(shù) AVCaptureSessionPresetPhoto這個(gè)最合適
    [self.session setSessionPreset:AVCaptureSessionPresetPhoto];

5.解決方案:,受系統(tǒng)豎屏旋轉(zhuǎn)開(kāi)關(guān)的影響,如果打開(kāi)豎屏鎖定,判斷設(shè)備方向就會(huì)失效,預(yù)覽的時(shí)候就和系統(tǒng)的不一致(使用DeviceOrientation這個(gè)類(lèi)處理的),具體代碼就是獲取設(shè)備方向時(shí)候使用DeviceOrientation來(lái)獲取真實(shí)設(shè)備方向,不受豎屏旋轉(zhuǎn)開(kāi)啟或關(guān)閉的影響.

- (AVCaptureVideoOrientation)avOrientationForDeviceOrientation:(UIDeviceOrientation)deviceOrientation
{
    AVCaptureVideoOrientation result = (AVCaptureVideoOrientation)deviceOrientation;
    if ([_deviceOrientation isEqualToString:@"protrait"]) {//
        result = AVCaptureVideoOrientationPortrait;
    }else if ([_deviceOrientation isEqualToString:@"down"]){
        result = AVCaptureVideoOrientationLandscapeRight;
    }else if ([_deviceOrientation isEqualToString:@"right"]){
        result = AVCaptureVideoOrientationLandscapeLeft;
    }else if ([_deviceOrientation isEqualToString:@"left"]){
        result = AVCaptureVideoOrientationLandscapeRight;
    }
    return result;
}

最后附上demo,總結(jié)下來(lái)其實(shí)沒(méi)什么難點(diǎn),還是自己沒(méi)有認(rèn)真分析問(wèn)題,拿出實(shí)質(zhì)解決方案,就是難點(diǎn)處繞來(lái)繞去.