//
// ViewController.m
// 02-人脸识别
//
// Created by Romeo on 15/9/25.
// Copyright © 2015年 itheima. All rights reserved.
//
#import "ViewController.h"
#import "FaceppAPI.h"
#import "UIView+AutoLayout.h"
@interface ViewController ()<UINavigationControllerDelegate, UIImagePickerControllerDelegate>
@property (weak, nonatomic) IBOutlet UIImageView *imageVIew;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
/**
UIImagePickerControllerSourceTypePhotoLibrary, 照片库
UIImagePickerControllerSourceTypeCamera, 相机
UIImagePickerControllerSourceTypeSavedPhotosAlbum 相册
*/
#pragma mark 相册
- (IBAction)selectPhotoClick:(id)sender {
//1. 首先判断是否可用
if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {
return;
}
//2. 创建选择控制器
UIImagePickerController *picker = [UIImagePickerController new];
//3. 设置类型
picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
//4. 设置代理
picker.delegate = self;
//5. 弹出
[self presentViewController:picker animated:YES completion:nil];
}
#pragma mark 相机
- (IBAction)selectCameClick:(id)sender {
//1. 首先判断是否可用
if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
return;
}
//2. 创建选择控制器
UIImagePickerController *picker = [UIImagePickerController new];
//3. 设置类型
picker.sourceType = UIImagePickerControllerSourceTypeCamera;
//4. 设置代理
picker.delegate = self;
//5. 弹出
[self presentViewController:picker animated:YES completion:nil];
}
#pragma mark Picker代理方法
//点击照片的时候调用
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info
{
//1. 获取选择的图像
UIImage *image = info[UIImagePickerControllerOriginalImage];
//orientation 0 --> 在做人脸识别, 一定要方向为0
//2. 校正方向
image = [self fixOrientation:image];
//3. 开始检测
NSData *data = UIImageJPEGRepresentation(image, 0.5);
// UIImagePNGRepresentation(<#UIImage * _Nonnull image#>)
//detection/detect 检测一张照片中的人脸信息（脸部位置、年龄、种族、性别等等）
FaceppResult *result = [[FaceppAPI detection] detectWithURL:nil orImageData:data];
//4. 获取性别,年龄
NSDictionary *attributeDict = result.content[@"face"][0][@"attribute"];
NSString *ageValue = attributeDict[@"age"][@"value"];
NSString *sexValue = [attributeDict[@"gender"][@"value"] isEqualToString:@"Male"] ? @"男性" : @"女性";
//5. 获取脸部位置 (比例值)
NSDictionary *positionDict = result.content[@"face"][0][@"position"];
CGFloat h = [positionDict[@"height"] floatValue];
CGFloat w = [positionDict[@"width"] floatValue];
CGFloat x = [positionDict[@"center"][@"x"] floatValue] - w * 0.5;
CGFloat y = [positionDict[@"center"][@"y"] floatValue] - h * 0.5;
//6. 画图--> 画脸到 image 上
//6.1 开启图像图形上下文
UIGraphicsBeginImageContextWithOptions( image.size, NO, 0);
//6.2 将原图先绘制到底部, 从(0, 0)点开始绘制
[image drawAtPoint:CGPointZero];
//6.3 画素材图像到图形上下文中
UIImage *aImage = [UIImage imageNamed:@"cang"];
// 根据原图的大小比例来计算自己的位置
CGFloat imageW = image.size.width;
CGFloat imageH = image.size.height;
[aImage drawInRect:CGRectMake(x * 0.01 * imageW , y * 0.01 * imageH, w * 0.01 * imageW, h * 0.01 * imageH)];
// 320 50% 160
//50 * 0.01 * 320 = 160
//6.4 合成新的图像
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
//6.5 关闭图像上下文
UIGraphicsEndImageContext();
//7. 在控制器显示
//删除原有约束,然后重新添加
// 删除原有约束
[self.imageVIew autoRemoveConstraintsAffectingView];
// 设置居中
[self.imageVIew autoCenterInSuperview];
// 设置宽高 --> 需要根据图片的比例来确定
//960 * 1080
// 假如我们需要宽度: 屏幕总宽度
// iPhone5 : 320
// iPhone6 : 375
CGFloat scale = newImage.size.width / [UIScreen mainScreen].bounds.size.width;
//Dimension : 尺寸 --> 宽高
[self.imageVIew autoSetDimension: ALDimensionWidth toSize:newImage.size.width / scale];
[self.imageVIew autoSetDimension:ALDimensionHeight toSize:newImage.size.height / scale];
self.imageVIew.image = newImage;
//8. 实现了代理方法一定要取消
[picker dismissViewControllerAnimated:YES completion:nil];
}
#pragma mark 方向校正
/**
1. 先将头部朝上
2. 将镜像反转
3. 重新合成输出
*/
- (UIImage*)fixOrientation:(UIImage*)aImage
{
// No-op if the orientation is already correct
if (aImage.imageOrientation == UIImageOrientationUp)
return aImage;
// We need to calculate the proper transformation to make the image upright.
// We do it in 2 steps: Rotate if Left/Right/Down, and then flip if Mirrored.
CGAffineTransform transform = CGAffineTransformIdentity;
switch (aImage.imageOrientation) {
case UIImageOrientationDown:
case UIImageOrientationDownMirrored:
transform = CGAffineTransformTranslate(transform, aImage.size.width, aImage.size.height);
transform = CGAffineTransformRotate(transform, M_PI);
break;
case UIImageOrientationLeft:
case UIImageOrientationLeftMirrored:
transform = CGAffineTransformTranslate(transform, aImage.size.width, 0);
transform = CGAffineTransformRotate(transform, M_PI_2);
break;
case UIImageOrientationRight:
case UIImageOrientationRightMirrored:
transform = CGAffineTransformTranslate(transform, 0, aImage.size.height);
transform = CGAffineTransformRotate(transform, -M_PI_2);
break;
default:
break;
}
switch (aImage.imageOrientation) {
case UIImageOrientationUpMirrored:
case UIImageOrientationDownMirrored:
transform = CGAffineTransformTranslate(transform, aImage.size.width, 0);
transform = CGAffineTransformScale(transform, -1, 1);
break;
case UIImageOrientationLeftMirrored:
case UIImageOrientationRightMirrored:
transform = CGAffineTransformTranslate(transform, aImage.size.height, 0);
transform = CGAffineTransformScale(transform, -1, 1);
break;
default:
break;
}
// Now we draw the underlying CGImage into a new context, applying the transform
// calculated above.
CGContextRef ctx = CGBitmapContextCreate(NULL, aImage.size.width, aImage.size.height,
CGImageGetBitsPerComponent(aImage.CGImage), 0,
CGImageGetColorSpace(aImage.CGImage),
CGImageGetBitmapInfo(aImage.CGImage));
CGContextConcatCTM(ctx, transform);
switch (aImage.imageOrientation) {
case UIImageOrientationLeft:
case UIImageOrientationLeftMirrored:
case UIImageOrientationRight:
case UIImageOrientationRightMirrored:
CGContextDrawImage(ctx, CGRectMake(0, 0, aImage.size.height, aImage.size.width), aImage.CGImage);
break;
default:
CGContextDrawImage(ctx, CGRectMake(0, 0, aImage.size.width, aImage.size.height), aImage.CGImage);
break;
}
// And now we just create a new UIImage from the drawing context
CGImageRef cgimg = CGBitmapContextCreateImage(ctx);
UIImage* img = [UIImage imageWithCGImage:cgimg];
CGContextRelease(ctx);
CGImageRelease(cgimg);
return img;
}
@end