拍照上传图片的压缩

来源：互联网发布：算法竞赛书籍推荐知乎编辑：程序博客网时间：2024/04/30 12:04

#pragma mark - UIImagePickerController delegate
//选择玩图片成功回调
- (void)imagePickerController:(UIImagePickerController*)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString*,id> *)info{
    [HITAudioPlayerManagerInstacnestartPalyAudioByFileName:@"bt_back"andType:@"wav"];
    [picker dismissViewControllerAnimated:YEScompletion:nil];
    if (self.type== 1) {
        if ([self.delegaterespondsToSelector:@selector(selectImageBackWithImage:)]) {
            [self.delegateselectImageBackWithImage:self.topShowImageView.image];
            [self.navigationControllerpopViewControllerAnimated:YES];
            return;
        }
    }
//    HITSubmitImageViewController *submitImageVC = [[HITSubmitImageViewController alloc]init];
//    submitImageVC.submitImage = info[@"UIImagePickerControllerOriginalImage"];
//    [self.navigationController pushViewController:submitImageVC animated:YES];
//    UIImage *imageNew = [self scaleToSize:info[@"UIImagePickerControllerOriginalImage"] size:CGSizeMake(kSCREEN_WIDTH, kSCREEN_HEIGHT - 100)];//上传拍照图片的处理
    UIImage *image = [selfcompressImage:info[@"UIImagePickerControllerOriginalImage"]newWidth:(kSCREEN_WIDTH,kSCREEN_HEIGHT - 100)];
//    UIImage *imageNew = [info objectForKey:@"UIImagePickerControllerEditedImage"];
//    NSData *updata = UIImageJPEGRepresentation(imageNew,0.5f);
//     UIImage *image = [UIImage imageWithData: updata];
    AGViewController *agview = [[AGViewControlleralloc]init];
    agview.imagess= image;//UIImagePickerControllerEditedImage修改后的图片//UIImagePickerControllerOriginalImage原始图片//info[@"UIImagePickerControllerOriginalImage"]
    agview.delegateImage= self;
    [selfpresentViewController:agviewanimated:YEScompletion:nil];

}

/**

* 等比缩放本图片大小
*
* @param newImageWidth 缩放后图片宽度，像素为单位
*
* @return self-->(image)
*/
- (UIImage*)compressImage:(UIImage*)image newWidth:(CGFloat)newImageWidth
{
    if (!image)return nil;
    float imageWidth = image.size.width;
    float imageHeight = image.size.height;
    float width = newImageWidth;
    float height = image.size.height/(image.size.width/width);

    float widthScale = imageWidth /width;
    float heightScale = imageHeight /height;

    // 创建一个bitmap的context
    // 并把它设置成为当前正在使用的context
    UIGraphicsBeginImageContext(CGSizeMake(width, height));

    if (widthScale > heightScale) {
        [image drawInRect:CGRectMake(0,0, imageWidth /heightScale , height)];
    }
    else {
        [image drawInRect:CGRectMake(0,0, width , imageHeight /widthScale)];
    }

    // 从当前context中创建一个改变大小后的图片
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    // 使当前的context出堆栈
    UIGraphicsEndImageContext();

    return newImage;

}

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