iPhone7以及iOS11以上发送拍摄的照片是hice格式的图片
所以在iPhone7以下的iOS11以下的系统手机显示白色框框!
解决方案:

   PHAsset * asset = [_assetDic valueForKey:_articleData.img];//PHAsset已经事先存到字典中
    PHImageRequestOptions *option = [[PHImageRequestOptions alloc] init];
    option.resizeMode = PHImageRequestOptionsResizeModeExact;
    option.networkAccessAllowed = YES;
    option.synchronous = YES;//同步执行
    // 从asset中获得图片
    [[PHImageManager defaultManager] requestImageDataForAsset:asset options:option resultHandler:^(NSData * _Nullable imageData, NSString * _Nullable dataUTI, UIImageOrientation orientation, NSDictionary * _Nullable info) {
         NSLog(@"---格式-- > %@",dataUTI);
        NSData *imageDataW = nil;
        if ([dataUTI isEqualToString:@"public.heif"] || [dataUTI isEqualToString:@"public.heic"]) {
            CIImage *ciImage = [CIImage imageWithData:imageData];
            CIContext *context = [CIContext context];
            NSData *jpgData = [context JPEGRepresentationOfImage:ciImage colorSpace:ciImage.colorSpace options:@{}];
            imageDataW = jpgData;
        } else {
            imageDataW = imageData;
        }
        if ([imageDataW length] / (1024 * 1024) > 3.0) {
            imageDataW = [[UIImage imageWithData: imageDataW]compressAndResize]; //图片大于3M压缩操作，可不调用此方法
        }
        // self.orignalImage = [CIImage imageWithCGImage:[[UIImage imageWithData: imageDataW] CGImage]];
//图片编辑用到的CIImage
        imgView.image = [UIImage imageWithData: imageDataW];
    }];

图片裁剪

            CGRect rectimg = CGRectMake(0,0,200,300);//图片裁剪范围
//                    NSLog(@"=== > %@",NSStringFromCGRect(rectimg));
            CGImageRef imageRef=CGImageCreateWithImageInRect([image CGImage],rectimg);
            UIImage *image1=[UIImage imageWithCGImage:imageRef];
            CGImageRelease(imageRef);//释放CGImageRef，否则内存升高
            _faceIageView.image = image1;

环信中获取照片的位置修改:

#pragma mark - UIImagePickerControllerDelegate
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    NSString *mediaType = info[UIImagePickerControllerMediaType];
    if ([mediaType isEqualToString:(NSString *)kUTTypeMovie]) {
        //视频类型
        NSURL *videoURL = info[UIImagePickerControllerMediaURL];
        // video url:
        // file:///private/var/mobile/Applications/B3CDD0B2-2F19-432B-9CFA-158700F4DE8F/tmp/capture-T0x16e39100.tmp.9R8weF/capturedvideo.mp4
        // we will convert it to mp4 format
        NSURL *mp4 = [self _convert2Mp4:videoURL];
        NSFileManager *fileman = [NSFileManager defaultManager];
        if ([fileman fileExistsAtPath:videoURL.path]) {
            NSError *error = nil;
            [fileman removeItemAtURL:videoURL error:&error];
            if (error) {
                NSLog(@"failed to remove file, error:%@.", error);
            }
        }
        [self sendVideoMessageWithURL:mp4];
        
    }else{
        //图片类型
        NSURL *url = info[UIImagePickerControllerReferenceURL];
        if (url == nil) {
            UIImage *orgImage = info[UIImagePickerControllerOriginalImage];
            [self sendImageMessage:orgImage];
        } else {
            
            PHImageRequestOptions *option = [[PHImageRequestOptions alloc] init];
            option.resizeMode = PHImageRequestOptionsResizeModeExact;
            option.networkAccessAllowed = YES;
            option.synchronous = YES;//同步执行
            
            if ([[UIDevice currentDevice].systemVersion doubleValue] >= 9.0f) {
                PHFetchResult *result = [PHAsset fetchAssetsWithALAssetURLs:@[url] options:nil];
                [result enumerateObjectsUsingBlock:^(PHAsset *asset , NSUInteger idx, BOOL *stop){
                    if (asset) {
                        [[PHImageManager defaultManager] requestImageDataForAsset:asset options:option resultHandler:^(NSData *data, NSString *uti, UIImageOrientation orientation, NSDictionary *dic){
                            
                            
                            NSData *imageDataW = nil;
                            //[str containsString:@"world"]
                            if ([uti isEqualToString:@"public.heif"] || [uti isEqualToString:@"public.heic"]) {
                                CIImage *ciImage = [CIImage imageWithData:data];
                                CIContext *context = [CIContext context];
                                NSData *jpgData = [context JPEGRepresentationOfImage:ciImage colorSpace:ciImage.colorSpace options:@{}];
                                
                                imageDataW = jpgData;
                                
                            } else {
                                imageDataW = data;
                            }
                            
                            //                            if ([imageDataW length] / (1024 * 1024) > 3.0) {
                            //                                imageDataW = [[UIImage imageWithData: imageDataW] compressAndResize]; //图片大于3M压缩操作，可不调用此方法
                            //                            }
                            
                            if (imageDataW != nil) {
                                [self sendImageMessageWithData:imageDataW];
                            } else {
                                [self showHint:NSEaseLocalizedString(@"message.smallerImage", @"The image size is too large, please choose another one")];
                            }
                        }];
                    }
                }];
            } else {
                ALAssetsLibrary *alasset = [[ALAssetsLibrary alloc] init];
                [alasset assetForURL:url resultBlock:^(ALAsset *asset) {
                    if (asset) {
                        ALAssetRepresentation* assetRepresentation = [asset defaultRepresentation];
                        Byte* buffer = (Byte*)malloc((size_t)[assetRepresentation size]);
                        NSUInteger bufferSize = [assetRepresentation getBytes:buffer fromOffset:0.0 length:(NSUInteger)[assetRepresentation size] error:nil];
                        NSData* fileData = [NSData dataWithBytesNoCopy:buffer length:bufferSize freeWhenDone:YES];
                        [self sendImageMessageWithData:fileData];
                    }
                } failureBlock:NULL];
            }
        }
    }
    
    
    [picker dismissViewControllerAnimated:YES completion:nil];
    
    self.isViewDidAppear = YES;
    [[EaseSDKHelper shareHelper] setIsShowingimagePicker:NO];
}