erpsuiteios/Redant Drivers/Apex And Drivers/Camera/RATakePhotoPreviewController.m

//
//  TakePhotoPreviewController.m
//  RA Image
//
//  Created by Jack on 2017/5/15.
//  Copyright © 2017年 USAI. All rights reserved.
//

#import "RATakePhotoPreviewController.h"
#import "const.h"
#import "UIImage+fixOrientation.h"

@interface RATakePhotoPreviewController ()<UIScrollViewDelegate>

@property (strong, nonatomic) IBOutlet UIScrollView *previewScroll;
@property (strong, nonatomic) IBOutlet UIView *editContainer;
@property (strong, nonatomic) IBOutlet UIButton *retakeBtn;
@property (strong, nonatomic) IBOutlet UIButton *usePhotoBtn;
@property (strong, nonatomic) IBOutlet UIView *toolBarView;

@property (nonatomic,strong) UIImageView *imgView;

@end

@implementation RATakePhotoPreviewController

+ (instancetype)viewControllerFromStoryboard {
    RATakePhotoPreviewController *previewVC = [[UIStoryboard storyboardWithName:@"Camera" bundle:nil] instantiateViewControllerWithIdentifier:[self storyboardID]];
    return previewVC;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    [self.view insertSubview:[UIView new] atIndex:0];
    
    self.editContainer.layer.borderColor = [UIColor lightGrayColor].CGColor;
    self.editContainer.layer.borderWidth = 0.5f;
    self.editContainer.userInteractionEnabled = NO;
//    UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(imageViewPinch:)];
//    [self.editContainer addGestureRecognizer:pinch];
    
    
    [self.previewScroll addSubview:self.imgView];
}
- (void)setPreImage:(UIImage *)preImage {
    _preImage = [preImage fixOrientation];
    //    self.nameLabel.text = name;
}
- (void)viewDidLayoutSubviews {
    [super viewDidLayoutSubviews];
    
    CGSize size = [self imgViewOriginSize];
    
    CGRect frame = CGRectMake(0, 70, size.width, size.height); // 水平居中
    
    if (frame.size.height < CGRectGetHeight(self.editContainer.frame)) { // 横屏拍照时，照片在编辑框垂直居中
        frame.origin.y = CGRectGetMinY(self.editContainer.frame) + (CGRectGetHeight(self.editContainer.frame) - CGRectGetHeight(frame)) * 0.5;
    }
    self.imgView.frame = frame;
}

- (BOOL)prefersStatusBarHidden {
    return YES;
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (CGSize)imgViewOriginSize {
    CGFloat width = CGRectGetWidth(self.previewScroll.bounds);
    CGFloat height = CGRectGetHeight(self.previewScroll.bounds);
    CGFloat w = self.preImage.size.width;
    CGFloat h = self.preImage.size.height;
    // 根据图片大小和ScrollView大小等比缩放，使ScrollView容得下图片
    float factor = MAX(w / width, h / height);
    factor = 1 / factor;
    
    CGSize size = CGSizeMake(w * factor, h * factor);
    return size;
}

- (UIImageView *)imgView {
    if (!_imgView) {
        _imgView = [[UIImageView alloc] initWithImage:self.preImage];
        _imgView.userInteractionEnabled = YES;
        
    }
    return _imgView;
}

- (UIImage *)captureImageInView:(UIView *)view {
    UIImage *img = nil;
    
//    UIGraphicsBeginImageContext(view.frame.size);
    UIGraphicsBeginImageContextWithOptions(view.frame.size, NO, 0.0);
    if ([view respondsToSelector:@selector(drawViewHierarchyInRect:afterScreenUpdates:)]) {
        [view drawViewHierarchyInRect:view.bounds afterScreenUpdates:YES];
    } else {
        [view.layer renderInContext:UIGraphicsGetCurrentContext()];
    }
    img = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    return img;
}

- (UIImage *)captureImageWithImage:(UIImage *)image inRect:(CGRect)rect {
    
    CGFloat scale = image.scale;
    rect.origin.x *= scale;
    rect.origin.y *= scale;
    rect.size.height *= scale;
    rect.size.width *= scale;
    CGImageRef imgRef = CGImageCreateWithImageInRect(image.CGImage, rect);
    UIImage *img = [UIImage imageWithCGImage:imgRef scale:0 orientation:image.imageOrientation];
    CGImageRelease(imgRef);
    return img;
    
    
    
}

- (IBAction)retakeBtnClick:(UIButton *)sender {
    if (self.photoHandler) {
        self.photoHandler(nil);
    }
    [self.navigationController popViewControllerAnimated:YES];
}

- (IBAction)usePhotoClick:(UIButton *)sender {
    
    if (self.photoHandler) {
        
        CGRect imgRect = self.imgView.frame;
        CGRect editRect = self.editContainer.frame;
        CGPoint contentOffset = self.previewScroll.contentOffset;
        CGRect clipRect = CGRectMake(editRect.origin.x + 1 + contentOffset.x, editRect.origin.y + 1 + contentOffset.y - imgRect.origin.y, editRect.size.width - 2, editRect.size.height -2);
        
        CGFloat xp = clipRect.origin.x / imgRect.size.width;
        CGFloat yp = clipRect.origin.y / imgRect.size.height;
        CGFloat wp = clipRect.size.width / imgRect.size.width;
        CGFloat hp = clipRect.size.height / imgRect.size.height;
        
        CGSize size = self.preImage.size;
        CGRect clipImgRect = CGRectMake(size.width * xp, size.height * yp, size.width * wp, size.height * hp);
        
        UIImage *img = [self captureImageWithImage:self.preImage inRect:clipImgRect];
        self.photoHandler(img);
    }
    if (self.popTo) {
        [self.navigationController popToViewController:self.popTo animated:YES];
    } else {
        [self.navigationController popViewControllerAnimated:YES];
    }
    
}

//-(void) testimg
//{
//    UIImageOrientation o =self.preImage.imageOrientation;
//    
//    CGRect imgviewRect = self.imgView.frame;
//    CGRect editRect = self.editContainer.frame;
//    CGPoint offset= self.previewScroll.contentOffset;
//    
//    double sscale=self.previewScroll.zoomScale;
//    CGSize contentsize=self.previewScroll.contentSize;
//    
//    CGRect imgScreenRect = CGRectMake(imgviewRect.origin.x-offset.x, imgviewRect.origin.y-offset.y, imgviewRect.size.width, imgviewRect.size.height);
//    
//    double scale = imgScreenRect.size.width/self.preImage.size.width;//1;//self.previewScroll.zoomScale*(imgviewRect.size.width/self.preImage.size.width);
//    CGRect rectimg = CGRectMake((editRect.origin.x-imgScreenRect.origin.x)/scale, (editRect.origin.y-imgScreenRect.origin.y)/scale, editRect.size.width/scale, editRect.size.height/scale);
////    UIImage * newimg=[UIImage imageWithCGImage:self.preImage.CGImage scale:1 orientation:UIImageOrientationUp];
//    UIImage * img= [self captureImageWithImage:self.preImage inRect:rectimg];//
//    UIImage* img1 =[self getSubImage:rectimg img:self.preImage];
//    return;
//}
//
//
//-(UIImage*)getSubImage:(CGRect)rect img:(UIImage*)img
//{
//    
//    //将UIImage转换成CGImageRef
//    CGImageRef sourceImageRef = [img CGImage];
//    
//    //按照给定的矩形区域进行剪裁
//    CGImageRef newImageRef = CGImageCreateWithImageInRect(sourceImageRef, rect);
//    
//    //将CGImageRef转换成UIImage
//    UIImage *newImage = [UIImage imageWithCGImage:newImageRef];
//    
//    //返回剪裁后的图片
//    return newImage;
//    
//    
//    CGImageRef subImageRef = CGImageCreateWithImageInRect(img.CGImage, rect);
//    UIImage* debugimg = [UIImage imageWithCGImage:subImageRef];
//    CGRect smallBounds = CGRectMake(0, 0, CGImageGetWidth(subImageRef), CGImageGetHeight(subImageRef));
//    
//    UIGraphicsBeginImageContext(smallBounds.size);
//    CGContextRef context = UIGraphicsGetCurrentContext();
//    CGContextDrawImage(context, smallBounds, subImageRef);
//    UIImage* smallImage = [UIImage imageWithCGImage:subImageRef];
//    UIGraphicsEndImageContext();
//    
//    return smallImage;
//}
#pragma mark - UIScrollViewDelegate

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView {
    return self.imgView;
}

- (void)scrollViewDidZoom:(UIScrollView *)scrollView {
    
    CGRect imgRect = self.imgView.frame;
    CGSize contentSize = scrollView.contentSize;
    contentSize.height += imgRect.origin.y;
    scrollView.contentSize = contentSize;
}

//#pragma mark - pinch
//
//- (void)imageViewPinch:(UIPinchGestureRecognizer *)pinch{
//    
//    UIScrollView *scroll = self.previewScroll;
//    UIImageView *imgv = [scroll.subviews firstObject];
//    
//    CGFloat width = scroll.frame.size.width;
//    CGFloat height = scroll.frame.size.height;
//    
//    imgv.transform = CGAffineTransformScale(imgv.transform, pinch.scale, pinch.scale);
//    CGSize size = scroll.contentSize;
//    //    size.width = size.width * pinch.scale;
//    //    size.height = size.height * pinch.scale;
//    size = imgv.frame.size;// bounds 和 frame 不一致
//    CGSize itemSize = self.editContainer.frame.size;
//    DebugLog(@"size %@",[NSValue valueWithCGSize:size]);
//    if (size.height < itemSize.height || size.width < itemSize.width) { // 禁止缩小得比原图小
//        imgv.transform = CGAffineTransformIdentity;
//        size = imgv.frame.size;
//    }
//    
//    
////    if (size.width < width) {
////        size.width = width;
////    }
////    if (size.height < height) {
////        size.height = height;
////    }
//    
//    scroll.contentSize = size;
//    scroll.contentOffset = CGPointMake((size.width - width) * 0.5, (size.height - height) * 0.5);
//    // 保持在屏幕中心
//    CGPoint offset = scroll.contentOffset;
//    CGFloat x = offset.x + width * 0.5;
//    CGFloat y = offset.y + height * 0.5;
//    imgv.center = CGPointMake(x, y);
//    
//    pinch.scale = 1;
//}



@end