遵守代理<UIImagePickerControllerDelegate>

1、弹窗

UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"请选择" message:nil preferredStyle:UIAlertControllerStyleActionSheet];
            UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];
            UIAlertAction *CameraAction = [UIAlertAction actionWithTitle:@"相机" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
                
                [weakself persentImagePicker:1];
                
            }];
            UIAlertAction *AlbumAction = [UIAlertAction actionWithTitle:@"相册" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
                
                [weakself persentImagePicker:2];
                
            }];
            
            [alertController addAction:CameraAction];
            [alertController addAction:AlbumAction];
            [alertController addAction:cancelAction];
            [weakself presentViewController:alertController animated:YES completion:nil];

2、 获取图片、照片

//调用本地相册
- (void)persentImagePicker:(int)type{
    if (!_imagePickerG) {
        ///初始化相机
        _imagePickerG = [[UIImagePickerController alloc]init];
        ///代理
        _imagePickerG.delegate = self;
    }
    if (type == 1) {//相机
        _imagePickerG.sourceType = UIImagePickerControllerSourceTypeCamera;
        _imagePickerG.allowsEditing = YES;
        [self.navigationController presentViewController:_imagePickerG animated:YES completion:nil];
    }else if (type == 2)//相册
    {
        _imagePickerG.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
        _imagePickerG.allowsEditing = YES;
        [self.navigationController presentViewController:_imagePickerG animated:YES completion:nil];
    }
    
}

///取消选择图片（拍照）
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{
    [picker dismissViewControllerAnimated:YES completion:nil];
}

///选择图片完成（从相册或者拍照完成）
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{
    //UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];///原图
    //获取修剪后的图片
    UIImage *imageUp = [info objectForKey:UIImagePickerControllerEditedImage];
    [self UpPic:imageUp];
    [picker dismissViewControllerAnimated:YES completion:nil];
}
/**
///选择图片完成（从相册或者拍照完成）
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{
    UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];///原图
    //获取修剪后的图片
    //UIImage *imageUp = [info objectForKey:UIImagePickerControllerEditedImage];
    
    CGSize newSize = CGSizeMake(image.size.width*0.5, image.size.height*0.5);
    UIImage *tempimage = [self reSizeImage:image toSize:newSize];
    NSData *data = UIImageJPEGRepresentation(tempimage, 1);
    if (data.length/2014>=1000) {
        newSize = CGSizeMake(tempimage.size.width*0.7, tempimage.size.height*0.7);
        tempimage = [self reSizeImage:image toSize:newSize];
        data = UIImageJPEGRepresentation(tempimage, 1);
    }

    [self SendBaiDuPress:tempimage];
    self.wordImageView.image = tempimage;
    [picker dismissViewControllerAnimated:YES completion:nil];
}

// 调整图片大小（这里是缩小图片）
- (UIImage *)reSizeImage:(UIImage *)image toSize:(CGSize)reSize
{
    UIGraphicsBeginImageContext(CGSizeMake(reSize.width, reSize.height));
    [image drawInRect:CGRectMake(0, 0, reSize.width, reSize.height)];
    UIImage *reSizeImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return reSizeImage;
}
*/

///保存图片到本地相册
-(void)imageTopicSave:(UIImage *)image{
    UIImageWriteToSavedPhotosAlbum(image, self, @selector(image: didFinishSavingWithError: contextInfo:), nil);
}
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo{
    if (error == nil) {
        
    }
    else{
        ///图片未能保存到本地
    }
}

3、上传图片

-(void)UpPic:(UIImage *)img
{
    NSString *user_uuid = [[NSUserDefaults standardUserDefaults] objectForKey:@"user_uuid"];
    if(user_uuid == nil)
    {
        LoginViewCTRL *loginViewCTRL = [[LoginViewCTRL alloc] init];
        loginViewCTRL.loginVieCTRLBlock = ^{
            
        };
        [self.navigationController pushViewController:loginViewCTRL animated:YES];
        
    }else
    {
        NSString *postUrl=[NSString stringWithFormat:@"%@%@%@",ServerOtherUrl,ProjectName,@"/user/updatePicture.do"];
        
        NSDictionary *parameters=@{@"user_uuid":user_uuid
                                   };
        [MBProgressHUD showHUDAddedTo:self.view animated:YES];
        NSData *imageData = UIImageJPEGRepresentation(img, 0.6);//image为要上传的图片(UIImage)
        AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
        manager.responseSerializer = [AFHTTPResponseSerializer serializer];
        [manager POST:postUrl parameters:parameters constructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData) {
            //
            NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
            formatter.dateFormat = @"yyyyMMddHHmmss";
            NSString *fileName = [NSString stringWithFormat:@"%@.png",[formatter stringFromDate:[NSDate date]]];
            //二进制文件，接口key值，文件路径，图片格式
            if (self.changePicType == 1)
            {
                [formData appendPartWithFileData:imageData name:@"head_img" fileName:fileName mimeType:@"image/jpg/png/jpeg"];
            }else if (self.changePicType == 2)
            {
                [formData appendPartWithFileData:imageData name:@"cover_img" fileName:fileName mimeType:@"image/jpg/png/jpeg"];
            }
            
        } progress:^(NSProgress * _Nonnull uploadProgress) {
            
        } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
            //
            [MBProgressHUD hideHUDForView:self.view animated:YES];
            NSLog(@"%@",task.currentRequest.URL);
            [self GainUserInfo];

 
        } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
            //
            [MBProgressHUD hideHUDForView:self.view animated:YES];
        }];
    }
    
}

注意：使用AFNetworking的方法：上传图片

//压缩图片
    NSData *imageData = UIImageJPEGRepresentation(image,0);
    //沙盒，准备保存的图片地址和图片名称
    NSDateFormatter *formatter=[[NSDateFormatter alloc]init];
    formatter.dateFormat=@"yyyyMMddHHmmss";
    NSString *str=[formatter stringFromDate:[NSDate date]];
    NSString *fullPath = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.jpeg",str]];
    //将图片写入文件中
    [imageData writeToFile:fullPath atomically:NO];
    //通过路径获取到保存的图片，可以在主界面上的image进行预览
    UIImage *saveImage = [[UIImage alloc]initWithContentsOfFile:fullPath];
    
    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
    manager.requestSerializer.timeoutInterval = 20;
    manager.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"text/plain", @"multipart/form-data", @"application/json", @"text/html", @"image/jpeg", @"image/png", @"application/octet-stream", @"text/json", nil];
    gron_User;
    gron_self;
    [manager.requestSerializer setValue:gron_Token forHTTPHeaderField:gron_AFNKEY];
    
    NSMutableDictionary *dict = [NSMutableDictionary dictionary];
    [dict setObject:@"1" forKey:@"flagFace"];
    [dict setObject:@"1" forKey:@"zipFlag"];
    [dict setObject:fullPath forKey:@"file"];
    
    NSString *url = @"https://xxx.com";
    
    MBProgressHUD *hub = [MBProgressHUD showHUDAddedTo:self.view animated:YES];
    gron_hub;
    
    [manager POST:url parameters:dict constructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData) {
      /* 该方法参数
         appendPartWithFileData：要上传的照片二进制流
         name：对应后台要上传接口的参数名
         fileName：要保存的文件名
         mimeType：要保存到服务器的文件类型
         */
        [formData appendPartWithFileData:imageData name:@"file" fileName:fullPath mimeType:@"image/jpg"];
        
    } progress:^(NSProgress * _Nonnull uploadProgress) {
        
    } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
        [hub hideAnimated:YES];
        DSLog(@"上传成功");
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        [hub hideAnimated:YES];
        DSLog(@"上传失败");
    }];