iOS框架AVFoundation实现相机拍照、录制视频

本文实例为大家分享了使用avfoundation框架实现相机拍照、录制视频的具体代码，供大家参考，具体内容如下

这里是demo

首先声明以下对象：

#import "customecameraviewcontroller.h" 
#import <avfoundation/avfoundation.h> 
#import <assetslibrary/assetslibrary.h> 
 
@interface customecameraviewcontroller ()<avcapturefileoutputrecordingdelegate> 
 
{ 
 // avcapturesession对象来执行输入设备和输出设备之间的数据传递 
 avcapturesession *isession; 
 //当前设备 
 avcapturedevice *idevice; 
 //输入设备 
 avcapturedeviceinput *ideviceinput; 
 //照片输出流 
 avcapturestillimageoutput *istillimageoutput; 
 //预览图层 
 avcapturevideopreviewlayer *ipreviewlayer; 
  
} 

初始化各对象:

-(void)viewdidload { 
 [super viewdidload]; 
  
 //点击屏幕对焦 
 uitapgesturerecognizer *tap = [[uitapgesturerecognizer alloc]initwithtarget:self action:@selector(focustap:)]; 
 [self.view addgesturerecognizer:tap]; 
  
  
 isession = [[avcapturesession alloc]init]; 
  
 nsarray *devicearray = [avcapturedevice deviceswithmediatype:avmediatypevideo]; 
 for (avcapturedevice *device in devicearray) { 
   
  //avcapturedevicepositionback 后置摄像头 
  //avcapturedevicepositionfront 前置摄像头 
  if (device.position == avcapturedevicepositionback) { 
   idevice = device; 
  } 
 } 
  
  
 isession.sessionpreset = [self getsessionpresetfordevice:idevice]; 
  
 ideviceinput = [[avcapturedeviceinput alloc]initwithdevice:idevice error:nil]; 
  
  
 ////输出设置。avvideocodecjpeg 输出jpeg格式图片 
 istillimageoutput = [[avcapturestillimageoutput alloc]init]; 
 nsdictionary *outputdic = [nsdictionary dictionarywithobjectsandkeys:avvideocodecjpeg,avvideocodeckey, nil nil]; 
 [istillimageoutput setoutputsettings:outputdic]; 
  
  
 //更改这个设备设置的时候必须先锁定设备，修改完后再解锁，否则崩溃 
 [idevice lockforconfiguration:nil]; 
 if ([idevice isflashmodesupported:avcaptureflashmodeoff]) { 
  [idevice setflashmode:avcaptureflashmodeoff]; 
 } 
 if ([idevice isfocusmodesupported:avcapturefocusmodeautofocus]) { 
  [idevice setfocusmode:avcapturefocusmodeautofocus]; 
 } 
 if ([idevice iswhitebalancemodesupported:avcapturewhitebalancemodeautowhitebalance]) { 
  [idevice setwhitebalancemode:avcapturewhitebalancemodeautowhitebalance]; 
 } 
 [idevice unlockforconfiguration]; 
  
 if ([isession canaddinput:ideviceinput]) { 
  [isession addinput:ideviceinput]; 
 } 
 if ([isession canaddoutput:istillimageoutput]) { 
  [isession addoutput:istillimageoutput]; 
 } 
 if ([isession canaddoutput:ivideooutput]) { 
  [isession addoutput:ivideooutput]; 
 } 
  
 //初始化预览图层 
 ipreviewlayer = [[avcapturevideopreviewlayer alloc]initwithsession:isession]; 
 [ipreviewlayer setvideogravity:avlayervideogravityresizeaspectfill]; 
 ipreviewlayer.frame = cgrectmake(0, 60, [uiscreen mainscreen].bounds.size.width, [uiscreen mainscreen].bounds.size.height-160); 
 [self.icameraview.layer addsublayer:ipreviewlayer]; 
  
 [isession startrunning];  
  
}

点击按钮拍照：

//拍照 
-(void)takepictures{ 
 avcaptureconnection *connection = [istillimageoutput connectionwithmediatype:avmediatypevideo]; 
 if (!connection) { 
  nslog(@"失败"); 
  return; 
 } 
 //设置焦距 
 [connection setvideoscaleandcropfactor:1]; 
  
 [istillimageoutput capturestillimageasynchronouslyfromconnection:connection completionhandler:^(cmsamplebufferref imagedatasamplebuffer, nserror *error) { 
  if (imagedatasamplebuffer==null) { 
   nslog(@"null"); 
   return ; 
  } 
   
  nsdata *data = [avcapturestillimageoutput jpegstillimagensdatarepresentation:imagedatasamplebuffer]; 
  uiimage *image = [uiimage imagewithdata:data]; 
   
   
 }]; 
}

image即为拍照所得图片.

设置session的avcapturesessionpreset属性

-(nsstring *)getsessionpresetfordevice:(avcapturedevice *)device{ 
 if ([device supportsavcapturesessionpreset:avcapturesessionpreset3840x2160]) { 
  return avcapturesessionpreset3840x2160; 
 } else if([device supportsavcapturesessionpreset:avcapturesessionpreset1920x1080]){ 
  return avcapturesessionpreset1920x1080; 
 } else if ([device supportsavcapturesessionpreset:avcapturesessionpreset1280x720]){ 
  return avcapturesessionpreset1280x720; 
 } else if ([device supportsavcapturesessionpreset:avcapturesessionpreset640x480]){ 
  return avcapturesessionpreset640x480; 
 } else if ([device supportsavcapturesessionpreset:avcapturesessionpreset352x288]){ 
  return avcapturesessionpreset352x288; 
 } else if ([device supportsavcapturesessionpreset:avcapturesessionpresethigh]){ 
  return avcapturesessionpresethigh; 
 } else if ([device supportsavcapturesessionpreset:avcapturesessionpresetmedium]){ 
  return avcapturesessionpresetmedium; 
 } else{ 
  return avcapturesessionpresetlow; 
 } 
}

设置闪光灯:

- (ibaction)iflashbtn:(id)sender { 
  
 [idevice lockforconfiguration:nil]; 
 if (idevice.flashmode == avcaptureflashmodeoff) { 
  if ([idevice isflashmodesupported:avcaptureflashmodeon]) { 
   [idevice setflashmode:avcaptureflashmodeon]; 
    
   [self.iflashbtn setbackgroundimage:[uiimage imagenamed:@"flashbtn"] forstate:uicontrolstatenormal]; 
  } 
 } else if (idevice.flashmode == avcaptureflashmodeon){ 
  if ([idevice isflashmodesupported:avcaptureflashmodeoff]) { 
   [idevice setflashmode:avcaptureflashmodeoff]; 
    
    [self.iflashbtn setbackgroundimage:[uiimage imagenamed:@"flashoffbtn"] forstate:uicontrolstatenormal]; 
  } 
 } 
 [idevice unlockforconfiguration]; 
  
}

切换前置摄像头与后置摄像头:

- (ibaction)ichangebtn:(id)sender { 
  
  
 nsarray *array = [avcapturedevice deviceswithmediatype:avmediatypevideo]; 
 avcapturedevice *newdevice = nil; 
 avcapturedeviceinput *newdeviceinput = nil; 
  
 catransition *animation = [catransition animation]; 
 animation.duration = 0.5f; 
 animation.timingfunction = [camediatimingfunction functionwithname:kcamediatimingfunctioneaseineaseout]; 
 animation.type = @"oglflip"; 
  
 if (idevice.position == avcapturedevicepositionback) { 
  animation.subtype = kcatransitionfromleft; 
  for (avcapturedevice *device in array) { 
   if (device.position == avcapturedevicepositionfront) { 
    newdevice = device; 
   } 
  } 
 } else if (idevice.position == avcapturedevicepositionfront){ 
  animation.subtype = kcatransitionfromright; 
  for (avcapturedevice *device in array) { 
   if (device.position == avcapturedevicepositionback) { 
    newdevice = device; 
   } 
  } 
 } 
  
 newdeviceinput = [avcapturedeviceinput deviceinputwithdevice:newdevice error:nil]; 
 [ipreviewlayer addanimation:animation forkey:nil]; 
 if (newdeviceinput!=nil) { 
  [isession beginconfiguration]; 
  [isession removeinput:ideviceinput]; 
   isession.sessionpreset = [self getsessionpresetfordevice:newdevice]; 
  if ([isession canaddinput:newdeviceinput]) { 
   [isession addinput:newdeviceinput]; 
   ideviceinput = newdeviceinput; 
   idevice = newdevice; 
  } else { 
   [isession addinput:ideviceinput]; 
  } 
  [isession commitconfiguration]; 
 } 
  
  
}

点击屏幕对焦：

//点击屏幕对焦 
-(void)focustap:(uigesturerecognizer *)tap{ 
 cgpoint tappoint = [tap locationinview:self.view]; 
  
  
 float y = tappoint.y; 
 if (y<60 || y>([uiscreen mainscreen].bounds.size.height-100)) { 
  return; 
 } 
  
 [idevice lockforconfiguration:nil]; 
 if ([idevice isfocusmodesupported:avcapturefocusmodeautofocus]) { 
  [idevice setfocuspointofinterest:cgpointmake(tappoint.x/self.view.frame.origin.x, tappoint.y/self.view.frame.origin.y)]; 
  [idevice setfocusmode:avcapturefocusmodeautofocus]; 
 } 
 [idevice unlockforconfiguration]; 
  
 self.ifocusimgview.center = tappoint; 
 self.ifocusimgview.hidden = no; 
 [uiview animatewithduration:0.3 animations:^{ 
  self.ifocusimgview.transform = cgaffinetransformmakescale(1.25, 1.25); 
 }completion:^(bool finished) { 
  [uiview animatewithduration:0.5 animations:^{ 
   self.ifocusimgview.transform = cgaffinetransformidentity; 
  } completion:^(bool finished) { 
   self.ifocusimgview.hidden = yes; 
  }]; 
 }]; 
} 

关于视频录制可以在demo中查看。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。