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LXFAVFoundation

2021已更新最新iOS API。这是一个模仿微信拍照，录像，保存照片或视频到自己本地自定义app相册里面的demo，具有快速简易接入项目的接口

博客地址： http://blog.csdn.net/sinat_31177681/article/details/75252341

1、优化系统权限相关的提示语，防止App Store审核不通过。替换iOS旧版本拍照代码

2、上调了帧率和像素，10s的视频2.8m左右 详细参数设置如下：

self.assetWriter = [AVAssetWriter assetWriterWithURL:self.videoURL fileType:AVFileTypeMPEG4 error:nil];

//写入视频大小

NSInteger numPixels = kScreenWidth * kScreenHeight;

//每像素比特

CGFloat bitsPerPixel = 12.0;

NSInteger bitsPerSecond = numPixels * bitsPerPixel;

// 码率和帧率设置
NSDictionary *compressionProperties = @{ AVVideoAverageBitRateKey : @(bitsPerSecond),
                                         AVVideoExpectedSourceFrameRateKey : @(15),
                                         AVVideoMaxKeyFrameIntervalKey : @(15),
                                         AVVideoProfileLevelKey : AVVideoProfileLevelH264BaselineAutoLevel };

//视频属性
self.videoCompressionSettings = @{ AVVideoCodecKey : AVVideoCodecH264,
                                   AVVideoScalingModeKey : AVVideoScalingModeResizeAspectFill,
                                   AVVideoWidthKey : @(kScreenHeight * 2),
                                   AVVideoHeightKey : @(kScreenWidth * 2),
                                   AVVideoCompressionPropertiesKey : compressionProperties };

_assetWriterVideoInput = [AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeVideo outputSettings:self.videoCompressionSettings];

3、新增监听屏幕方向，支持各个方向录制，查看录制的小视频时，会按home键在下方正常显示

4、新增连续聚焦连续曝光功能

5、新增横屏拍照

6、新增捏合手势对录制小视频的支持，现在小视频支持最大拉近3倍距离录制