引言
在iOS中使用摄像头拍照，录制视频有两种方式，
- 使用系统现成的UIImagePickerController控件
- 使用AVFoundation框架中的一些类自定义
本篇博客我们先来使用系统现成的UIImagePickerController控件完成拍照，视频录制功能。
要用UIImagePickerController来拍照或者录制视频通常可以分为如下步骤：
创建UIImagePickerController对象。
指定拾取源，平时选择照片时使用的拾取源是照片库或者相簿，此刻需要指定为摄像头类型。
指定摄像头，前置摄像头或者后置摄像头。
设置媒体类型mediaType，注意如果是录像必须设置，如果是拍照此步骤可以省略，因为mediaType默认包含kUTTypeImage（注意媒体类型定义在MobileCoreServices.framework中）
指定捕获模式，拍照或者录制视频。（视频录制时必须先设置媒体类型再设置捕获模式
展示UIImagePickerController(通常以模态窗口形式打开）。
拍照和录制视频结束后在代理方法中展示/保存照片或视频。
当然这个过程中有很多细节可以设置，例如是否显示拍照控制面板，拍照后是否允许编辑等等，通过上面的属性/方法列表相信并不难理解。下面就以一个示例展示如何使用UIImagePickerController来拍照和录制视频，下面的程序中只要将_isVideo设置为YES就是视频录制模式，录制完后在主视图控制器中自动播放；如果将_isVideo设置为NO则为拍照模式，拍照完成之后在主视图控制器中显示拍摄的照片：
#import "AVImageVideoSystemViewController.h"
#import <AVFoundation/AVFoundation.h>
#import <MobileCoreServices/MobileCoreServices.h>
@interface AVImageVideoSystemViewController ()<UINavigationControllerDelegate, UIImagePickerControllerDelegate>
@property (nonatomic, strong) UIImagePickerController * pickerController;
@property (nonatomic, strong) AVPlayer * player;
@property (nonatomic, assign) BOOL isVideo;
@property (nonatomic, strong) UIImageView * showImageView;
@end
@implementation AVImageVideoSystemViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
self.view.backgroundColor = [UIColor whiteColor];
self.title = @"系统控件拍照和录像";
_isVideo = YES;
[self setupUI];
}
#pragma mark - UIImagePickerControllerDelegate
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(nullable NSDictionary<NSString *,id> *)editingInfo{
}
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{
NSString * mediaType = [info objectForKey:UIImagePickerControllerMediaType];
if ([mediaType isEqualToString:(NSString *)kUTTypeImage]) { //如果是拍照
UIImage * image;
//如果允许编辑则获得编辑后的照片，否则获取原始照片
if (_pickerController.allowsEditing) {
image = [info objectForKey:UIImagePickerControllerEditedImage];//获取编辑后的照片
} else {
image = [info objectForKey:UIImagePickerControllerOriginalImage];//获取原始照片
}
[self.showImageView setImage:image];
UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);//保存到相簿
} else if([mediaType isEqualToString:(NSString *)kUTTypeMovie]){ //如果是录制视频
NSURL * url = [info objectForKey:UIImagePickerControllerMediaURL];
NSString * urlStr = [url path];
if (UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(urlStr)) {
//保存视频到相簿，注意也可以使用ALAssetsLibrary来保存
UISaveVideoAtPathToSavedPhotosAlbum(urlStr, self, @selector(video:didFinishSavingWithError:contextInfo:), nil);
}
}
[self dismissViewControllerAnimated:YES completion:nil];
}
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{
NSLog(@"放弃");
[self dismissViewControllerAnimated:YES completion:nil];
}
#pragma mark - 点击方法
- (void)clickButton:(UIButton *)sender{
[self presentViewController:self.pickerController animated:YES completion:nil];
}
#pragma mark - 自定义方法
- (void)video:(NSString *)videoPath didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo{
if (error) {
NSLog(@"保存视频过程中发生错误，错误信息:%@",error.localizedDescription);
} else {
NSLog(@"视频保存成功");
//录制完后自动播放
NSURL * url = [NSURL fileURLWithPath:videoPath];
_player = [AVPlayer playerWithURL:url];
AVPlayerLayer * playerLayer = [AVPlayerLayer playerLayerWithPlayer:_player];
playerLayer.frame = self.showImageView.bounds;
[self.showImageView.layer addSublayer:playerLayer];
[_player play];
}
}
- (void)setupUI{
[self.view addSubview:self.showImageView];
UIButton * button = [UIButton buttonWithType:UIButtonTypeCustom];
[button setTitle:@"拍录" forState:UIControlStateNormal];
[button setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
button.frame = CGRectMake(100, 500, 60, 60);
button.center = CGPointMake(self.view.bounds.size.width/2, self.view.bounds.size.height-60);
button.layer.cornerRadius = 30;
button.layer.masksToBounds = YES;
[button addTarget:self action:@selector(clickButton:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];
}
- (UIImagePickerController *)pickerController{
if (!_pickerController) {
_pickerController = [[UIImagePickerController alloc] init];
//设置_pickerController的来源，这里设置为摄像头。
/*
UIImagePickerControllerSourceTypePhotoLibrary：照片库
，默认值
UIImagePickerControllerSourceTypeCamera：摄像头
UIImagePickerControllerSourceTypeSavedPhotosAlbum：相
*/
_pickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
//设置摄像头类型
/*
UIImagePickerControllerCameraDeviceRear,//后置摄像头
UIImagePickerControllerCameraDeviceFront //前置摄像头
*/
_pickerController.cameraDevice = UIImagePickerControllerCameraDeviceRear;
if (_isVideo) {//设置媒体类型为视频，默认为kUTTypeImage；
_pickerController.mediaTypes = @[(NSString *)kUTTypeMovie];
_pickerController.videoQuality = UIImagePickerControllerQualityTypeIFrame1280x720;
_pickerController.cameraCaptureMode = UIImagePickerControllerCameraCaptureModeVideo;
}else{//设置摄像头捕获模式为 UIImagePickerControllerCameraCaptureModePhoto（默认就是）
_pickerController.cameraCaptureMode = UIImagePickerControllerCameraCaptureModePhoto;
}
_pickerController.allowsEditing = YES; // 允许编辑
_pickerController.delegate = self; //设置代理，检测操作
}
return _pickerController;
}
- (UIImageView *)showImageView{
if (!_showImageView) {
_showImageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 375, self.view.bounds.size.height-100)];
_showImageView.contentMode = UIViewContentModeScaleAspectFill;
}
return _showImageView;
}
@end
效果
