iOS打开摄像头录像调用系统的UI界面,也可以自定义UI界面
一、UIImagePickerController类UIImagePickerController 这个类可以为大家提供照相的功能,以及图片,视频浏览的功能。
二、检查硬件是否安装有摄像头或者允许操作相册 这些公共的方法，我们也许会用到，我就贴了！So easy！！！#pragma mark - 摄像头和相册相关的公共类
// 判断设备是否有摄像头
- (BOOL) isCameraAvailable{
return [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera];
}
// 前面的摄像头是否可用
- (BOOL) isFrontCameraAvailable{
return [UIImagePickerControllerisCameraDeviceAvailable:UIImagePickerControllerCameraDeviceFront];
}
// 后面的摄像头是否可用
- (BOOL) isRearCameraAvailable{
return [UIImagePickerControllerisCameraDeviceAvailable:UIImagePickerControllerCameraDeviceRear];
}
// 判断是否支持某种多媒体类型：拍照，视频
- (BOOL) cameraSupportsMedia:(NSString *)paramMediaType sourceType:(UIImagePickerControllerSourceType)paramSourceType{
__block BOOL result = NO;
if ([paramMediaType length] == 0){
NSLog(@”Media type is empty.”);
return NO;
}
NSArray *availableMediaTypes =[UIImagePickerControlleravailableMediaTypesForSourceType:paramSourceType];
[availableMediaTypes enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL*stop) {
NSString *mediaType = (NSString *)obj;
if ([mediaTypeisEqualToString:paramMediaType]){
result = YES;
*stop= YES;
}
}];
return result;
}
// 检查摄像头是否支持录像
- (BOOL) doesCameraSupportShootingVideos{
return [self cameraSupportsMedia:( NSString *)kUTTypeMoviesourceType:UIImagePickerControllerSourceTypeCamera];
}
// 检查摄像头是否支持拍照
- (BOOL) doesCameraSupportTakingPhotos{
return [self cameraSupportsMedia:( NSString *)kUTTypeImagesourceType:UIImagePickerControllerSourceTypeCamera];
}
#pragma mark - 相册文件选取相关
// 相册是否可用
- (BOOL) isPhotoLibraryAvailable{
return [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary];
}
// 是否可以在相册中选择视频
- (BOOL) canUserPickVideosFromPhotoLibrary{
return [self cameraSupportsMedia:( NSString *)kUTTypeMoviesourceType:UIImagePickerControllerSourceTypePhotoLibrary];
}
// 是否可以在相册中选择视频
- (BOOL) canUserPickPhotosFromPhotoLibrary{
return [self cameraSupportsMedia:( NSString *)kUTTypeImagesourceType:UIImagePickerControllerSourceTypePhotoLibrary];
}
三、用摄像头进行拍照和录像功能 1.我们将UIImagePickerController功能写在一个按钮的点击事件中：
#pragma mark - 拍照按钮事件
- (void)ClickControlAction:(id)sender{
// 判断有摄像头，并且支持拍照功能
if ([self isCameraAvailable] && [self doesCameraSupportTakingPhotos]){
// 初始化图片选择控制器
UIImagePickerController *controller = [[UIImagePickerController alloc] init];
[controller setSourceType:UIImagePickerControllerSourceTypeCamera];// 设置类型
// 设置所支持的类型，设置只能拍照，或则只能录像，或者两者都可以
NSString *requiredMediaType = ( NSString *)kUTTypeImage;
NSString *requiredMediaType1 = ( NSString *)kUTTypeMovie;
NSArray *arrMediaTypes=[NSArray arrayWithObjects:requiredMediaType, requiredMediaType1,nil];
[controller setMediaTypes:arrMediaTypes];
// 设置录制视频的质量
[controller setVideoQuality:UIImagePickerControllerQualityTypeHigh];
//设置最长摄像时间
[controller setVideoMaximumDuration:10.f];
[controller setAllowsEditing:YES];// 设置是否可以管理已经存在的图片或者视频
[controller setDelegate:self];// 设置代理
[self.navigationController presentModalViewController:controller animated:YES];
[controller release];
} else {
NSLog(@”Camera is not available.”);
}
}
解释： 2. setSourceType方法 通过设置 setSourceType方法可以确定调用出来的 UIImagePickerController所显示出来的界面typedef NS_ENUM(NSInteger, UIImagePickerControllerSourceType) {
UIImagePickerControllerSourceTypePhotoLibrary,
UIImagePickerControllerSourceTypeCamera,
UIImagePickerControllerSourceTypeSavedPhotosAlbum
};
分别表示：图片列表，摄像头，相机相册 3.setMediaTypes方法// 设置所支持的类型，设置只能拍照，或则只能录像，或者两者都可以
NSString *requiredMediaType = ( NSString *)kUTTypeImage;
NSString *requiredMediaType1 = ( NSString *)kUTTypeMovie;
NSArray *arrMediaTypes=[NSArray arrayWithObjects:requiredMediaType, requiredMediaType1,nil];
[controller setMediaTypes:arrMediaTypes];
4.关于UIImagePickerControllerDelegate协议 我们要对我们拍摄的照片和视频进行存储，那么就要实现 UIImagePickerControllerDelegate 协议的方法。#pragma mark - UIImagePickerControllerD elegate 代理方法
// 保存图片后到相册后，调用的相关方法，查看是否保存成功
- (void) imageWasSavedSuccessfully:(UIImage *)paramImage didFinishSavingWithError:(NSError *)paramError contextInfo:(void *)paramContextInfo{
if (paramError == nil){
NSLog(@”Image was saved successfully.”);
} else {
NSLog(@”An error happened while saving the image.”);
NSLog(@”Error = %@”, paramError);
}
}
// 当得到照片或者视频后，调用该方法
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
NSLog(@”Picker returned successfully.”);
NSLog(@”%@”, info);
NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];
// 判断获取类型：图片
if ([mediaType isEqualToString:( NSString *)kUTTypeImage]){
UIImage *theImage = nil;
// 判断，图片是否允许修改
if ([picker allowsEditing]){
//获取用户编辑之后的图像
theImage = [info objectForKey:UIImagePickerControllerEditedImage];
} else {
// 照片的元数据参数
theImage = [info objectForKey:UIImagePickerControllerOriginalImage];
}
// 保存图片到相册中
SEL selectorToCall = @selector(imageWasSavedSuccessfully:didFinishSavingWithError:contextInfo:);
UIImageWriteToSavedPhotosAlbum(theImage, self,selectorToCall, NULL);
}else if ([mediaType isEqualToString:(NSString *)kUTTypeMovie]){
// 判断获取类型：视频
//获取视频文件的url
NSURL* mediaURL = [info objectForKey:UIImagePickerControllerMediaURL];
//创建ALAssetsLibrary对象并将视频保存到媒体库
// Assets Library 框架包是提供了在应用程序中操作图片和视频的相关功能。相当于一个桥梁，链接了应用程序和多媒体文件。
ALAssetsLibrary *assetsLibrary = [[ALAssetsLibrary alloc] init];
// 将视频保存到相册中
[assetsLibrary writeVideoAtPathToSavedPhotosAlbum:mediaURL
completionBlock:^(NSURL *assetURL,NSError *error) {
if (!error) {
NSLog(@”captured video saved with no error.”);
}else{
NSLog(@”error occured while saving the video:%@”, error);
}
}];
[assetsLibrary release];
}
[picker dismissModalViewControllerAnimated:YES];
}
// 当用户取消时，调用该方法
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{
[picker dismissModalViewControllerAnimated:YES];
}
四、从相册获取图片和视频数据 1.我们将功能封装在一个按钮的点击事件中#pragma mark - 相册操作
- (void)ClickShowPhotoAction:(id)sender{
if ([self isPhotoLibraryAvailable]){
UIImagePickerController *controller = [[UIImagePickerController alloc]init];
[controller setSourceType:UIImagePickerControllerSourceTypePhotoLibrary];// 设置类型
NSMutableArray *mediaTypes = [[NSMutableArray alloc] init];
if ([self canUserPickPhotosFromPhotoLibrary]){
[mediaTypes addObject:( NSString *)kUTTypeImage];
}
if ([self canUserPickVideosFromPhotoLibrary]){
[mediaTypes addObject:( NSString *)kUTTypeMovie];
}
[controller setMediaTypes:mediaTypes];
[controller setDelegate:self];// 设置代理
[self.navigationController presentModalViewController:controlleranimated:YES];
[controller release];
[mediaTypes release];
}
}
2.关于UIImagePickerControllerDelegate协议，我们可以重用。 在这里，就不用赘述了！ 最后，需要说的是， UIImagePickerControllerDelegate 协议中-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info方法，中的info值，会根据我们操作的类型不同，而产生了不同的数据信息：
当操作的为图片时：：
{
UIImagePickerControllerCropRect = “NSRect: {{0, 405}, {2448, 2449}}”;
UIImagePickerControllerEditedImage = “”;
UIImagePickerControllerMediaMetadata = {
DPIHeight = 72;
DPIWidth = 72;
Orientation = 6;
”{Exif}” = {
ApertureValue = “2.526068811667588”;
BrightnessValue = “-0.0709875088566263”;
ColorSpace = 1;
DateTimeDigitized = “2013:04:05 16:43:00”;
DateTimeOriginal = “2013:04:05 16:43:00”;
ExposureMode = 0;
ExposureProgram = 2;
ExposureTime = “0.05882352941176471”;
FNumber = “2.4”;
Flash = 24;
FocalLenIn35mmFilm = 35;
FocalLength = “4.28”;
ISOSpeedRatings = (
400
);
MeteringMode = 5;
PixelXDimension = 3264;
PixelYDimension = 2448;
SceneType = 1;
SensingMethod = 2;
Sharpness = 0;
ShutterSpeedValue = “4.099543917546131”;
SubjectArea = (
1631,
1223,
881,
881
);
WhiteBalance = 0;
};
”{TIFF}” = {
DateTime = “2013:04:05 16:43:00”;
Make = Apple;
Model = “iPhone 4S”;
Software = “5.1.1”;
XResolution = 72;
YResolution = 72;
};
};
UIImagePickerControllerMediaType = “public.image”;
UIImagePickerControllerOriginalImage = “”;
}
当我们操作的为视频时：{
UIImagePickerControllerMediaType = “public.movie”;
UIImagePickerControllerMediaURL = “file://localhost/private/var/mobile/Applications/22A14825-DD7E-48E1-A1D5-2D85B82095B5/tmp/capture-T0x1363a0.tmp.etXfD4/capturedvideo.MOV”;
}
================================
1.调用系统的UI界面
要用UIImagePickerController来拍照或者录制视频通常可以分为如下步骤：
1. 创建UIImagePickerController对象。 2. 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。 3. 指定摄像头，前置摄像头或者后置摄像头。 4. 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） 5. 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） 6. 展示UIImagePickerController(通常以模态窗口形式打开）。 7. 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。.h
#import "GetFilePath.h" @interface MyViewController () <UINavigationControllerDelegate, UIImagePickerControllerDelegate> @end @implementation MyViewController //触发事件：拍照 - (void)addCamera { UIImagePickerController *picker = [[UIImagePickerController alloc] init]; picker.delegate = self; picker.allowsEditing = YES; //可编辑 //判断是否可以打开照相机 if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) { //摄像头 //UIImagePickerControllerSourceTypeSavedPhotosAlbum:相机胶卷 picker.sourceType = UIImagePickerControllerSourceTypeCamera; } else { //否则打开照片库 picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; } [self presentViewController:picker animated:YES completion:nil]; } //触发事件：录像 - (void)addVideo { UIImagePickerController *picker = [[UIImagePickerController alloc] init]; picker.delegate = self; picker.allowsEditing = YES; if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) { picker.sourceType = UIImagePickerControllerSourceTypeCamera; picker.mediaTypes = [UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypeCamera]; picker.videoQuality = UIImagePickerControllerQualityTypeMedium; //录像质量 picker.videoMaximumDuration = 600.0f; //录像最长时间 picker.mediaTypes = [NSArray arrayWithObjects:@"public.movie", nil]; } else { UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"温馨提示" message:@"当前设备不支持录像功能" delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil]; [alert show]; } //跳转到拍摄页面 [self presentViewController:picker animated:YES completion:nil]; } #pragma mark - UIImagePickerControllerDelegate //拍摄完成后要执行的代理方法 - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info { NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType]; BOOL success; NSFileManager *fileManager = [NSFileManager defaultManager]; if ([mediaType isEqualToString:@"public.image"]) { //得到照片 UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage]; if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) { //图片存入相册 UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil); } NSString *imagePath = [GetFilePath getSavePathWithFileSuffix:@"png"]; success = [fileManager fileExistsAtPath:imagePath]; if (success) { [fileManager removeItemAtPath:imagePath error:nil]; } NSData *imageData = UIImagePNGRepresentation(image); [imageData writeToFile:imagePath atomically:YES]; //写入本地 success = [fileManager fileExistsAtPath:imagePath]; if (success) { NSLog(@"图片写入成功,image路径:%@",imagePath); } } else if ([mediaType isEqualToString:@"public.movie"]) { NSString *videoPath = [GetFilePath getSavePathWithFileSuffix:@"mov"]; success = [fileManager fileExistsAtPath:videoPath]; if (success) { [fileManager removeItemAtPath:videoPath error:nil]; } NSURL *videoURL = [info objectForKey:UIImagePickerControllerMediaURL]; NSData *videlData = [NSData dataWithContentsOfURL:videoURL]; [videlData writeToFile:videoPath atomically:YES]; //写入本地 //存储数据 success = [fileManager fileExistsAtPath:videoPath]; if (success) { NSLog(@"media 写入成功,video路径:%@",videoPath); } } [self dismissViewControllerAnimated:YES completion:nil]; } //进入拍摄页面点击取消按钮 - (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker { [self dismissViewControllerAnimated:YES completion:nil]; }.h
#import <Foundation/Foundation.h> @interface GetFilePath : NSObject //获取要保存的本地文件路径 + (NSString *)getSavePathWithFileSuffix:(NSString *)suffix; //获取录像的缩略图 + (UIImage *)getVideoThumbnailWithFilePath:(NSString *)filePath; + (UIImage *)getImage:(NSString *)filePath; @end.m
#import "GetFilePath.h" #import <MediaPlayer/MediaPlayer.h> #import <AVFoundation/AVFoundation.h> @implementation GetFilePath + (NSString *)getSavePathWithFileSuffix:(NSString *)suffix { NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentPath = [paths objectAtIndex:0]; NSDate *date = [NSDate date]; //获取当前时间 NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init]; [dateFormat setDateFormat:@"yyyyMMddHHmmss"]; NSString *curretDateAndTime = [dateFormat stringFromDate:date]; //获取用户userID NSDictionary *userDic= [[NSUserDefaults standardUserDefaults] objectForKey:UserInformation]; //命名文件 NSString *fileName = [NSString stringWithFormat:@"%@%@.%@",userDic[@"UserID"],curretDateAndTime,suffix]; //指定文件存储路径 NSString *filePath = [documentPath stringByAppendingPathComponent:fileName]; return filePath; } + (UIImage *)getVideoThumbnailWithFilePath:(NSString *)filePath { MPMoviePlayerController *moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:[NSURL fileURLWithPath:filePath]]; moviePlayer.shouldAutoplay = NO; UIImage *image = [moviePlayer thumbnailImageAtTime:1.0 timeOption:MPMovieTimeOptionNearestKeyFrame]; return image; } + (UIImage *)getImage:(NSString *)filePath { NSDictionary *options = [NSDictionary dictionaryWithObject:[NSNumber numberWithBool:NO] forKey:AVURLAssetPreferPreciseDurationAndTimingKey]; NSURL *url = [NSURL fileURLWithPath:filePath]; AVURLAsset *urlAsset = [[AVURLAsset alloc] initWithURL:url options:options]; AVAssetImageGenerator *generator = [AVAssetImageGenerator assetImageGeneratorWithAsset:urlAsset]; generator.appliesPreferredTrackTransform = YES; generator.maximumSize = CGSizeMake(60, 60); CGImageRef imageRef = [generator copyCGImageAtTime:CMTimeMake(10, 10) actualTime:NULL error:nil]; UIImage *image = [UIImage imageWithCGImage:imageRef]; return image; }
