UIImagePickerController 拍照

-(void)photo:(UIButton *)buton
{
UIImagePickerController *picker =[[UIImagePickerController alloc]init];
picker.delegate=self;
picker.sourceType =UIImagePickerControllerSourceTypePhotoLibrary;
picker.mediaTypes=[NSArray arrayWithObject:@"public.image"];
[self presentViewController:picker animated:YES completion:nil];
}

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
[picker dismissViewControllerAnimated:NO completion:nil];
}

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info
{
NSString *mediaType =[info objectForKey:UIImagePickerControllerMediaType];
if ([mediaType isEqualToString:@"public.image"]) {
UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];
NSDateFormatter *format =[[NSDateFormatter alloc]init];
[format setDateFormat:@"yyyyMMddHHmmss"];
NSString *now =[NSString stringWithFormat:@"%@",[format stringFromDate:[NSDate date]]];
NSArray *path =NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSFileManager *manager =[NSFileManager defaultManager];
NSString *mcPaths =[[path objectAtIndex:0]stringByAppendingString:@"/"];
NSError *erro;
[manager createDirectoryAtPath:mcPaths
withIntermediateDirectories:YES
attributes:nil
error:&erro];
//文件名字
NSString *nameString =[NSString stringWithFormat:@"%@.jpg",now];
//文件存储路径
NSString *fullPathToFile =[NSString stringWithFormat:@"%@%@",mcPaths,nameString];
NSData* imageData = UIImageJPEGRepresentation(image, 0.5);
[imageData writeToFile:fullPathToFile atomically:NO];
NSMutableDictionary *dic =[[NSMutableDictionary alloc]init];
[dic setObject:nameString forKey:@"fileName"];
[dic setObject:fullPathToFile forKey:@"fileUrl"];
photoArray =[[NSMutableArray alloc]initWithObjects:dic, nil];

NSData *data = [NSData dataWithContentsOfFile:[[photoArray objectAtIndex:0] objectForKey:@"fileUrl"]];
[btn setBackgroundImage:[UIImage imageWithData:data] forState:UIControlStateNormal];
//将照片保存到相册
//        UIImageWriteToSavedPhotosAlbum(image, self,
//                                       @selector(image:didFinishSavingWithError:contextInfo:), nil);
[picker dismissViewControllerAnimated:YES completion:nil];
}
}

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";

}