表情是特殊的串。详细使用见
《表情包组件》。
通过UITextView插入NSTextAttachment来显示图片。很不幸NSTextAttachment只能展示图片，不能展示视频。可以通过类继承来实现把视频链接存入它的子类，展示只能按照视频的首帧图展示。
视频的和图片的上产可以通过第三方组件LFImagePickerController选择视频和图片，视频可以可以拿到视频的首帧图和NSData类型的视频数据。
然后把视频或图像上传服务器，服务器返回它的地址。
最后解析UITextView的attributedText，组装h5格式字符串发送给后台。
至于在其它客户端的展示只能使用标准h5进程组件wkwebview来展示了，这样视频图片文字都能正常展示了。这个下一篇文章介绍，防止文章又臭又长。
注意：咱们常用的TZImagePickerController的demo无法拿到视频数据流，只能拿到PHAsset，无法拿到云上的视频，我折腾了半天通过PHAsset也没有拿到视频流，若你牛你可以自己继续探索，反正我是放弃了。别说些理论上的东西或网上查出的东西，我只相信实践是检验真理的唯一标准，自己实际搞出来才是真的正确。其实有很多技术就隔一层窗户纸，但是哪怕差一个属性设置。若不知道导致不能真正实现也是白搭。有现成的LFImagePickerController帮你搞定一切，不用你为这绞尽脑汁。
DYTextAttachment.h文件
#import <UIKit/UIKit.h> typedef NS_ENUM(NSInteger, DYFileType) { DYFileTypeText = 0,//第一种状态 DYFileTypeImage = 1,//第二种状态 DYFileTypeVideo = 2 //第三种状态 }; @interface DYTextAttachment : NSTextAttachment @property(strong, nonatomic) NSString *emojiTag; @property(assign, nonatomic) CGSize emojiSize; //For emoji image size @property (nonatomic, assign) BOOL isVideo; @property(strong, nonatomic) NSString *inputStr; @property(strong, nonatomic) NSString *dataFilePath; @property(nonatomic, assign) DYFileType dyFileType; @end
DYTextAttachment.m文件
#import "DYTextAttachment.h" @implementation DYTextAttachment - (CGRect)attachmentBoundsForTextContainer:(NSTextContainer *)textContainer proposedLineFragment:(CGRect)lineFrag glyphPosition:(CGPoint)position characterIndex:(NSUInteger)charIndex { return CGRectMake(0, 0, _emojiSize.width, _emojiSize.height); } @end
获取图片或视频并组装数据发送图片或视频上传
- (void)lf_imagePickerController:(LFImagePickerController *)picker didFinishPickingResult:(NSArray <LFResultObject /* <LFResultImage/LFResultVideo> */*> *)results; { NSString *documentPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES) objectAtIndex:0]; NSString *thumbnailFilePath = [documentPath stringByAppendingPathComponent:@"thumbnail"]; NSString *originalFilePath = [documentPath stringByAppendingPathComponent:@"original"]; NSFileManager *fileManager = [NSFileManager new]; if (![fileManager fileExistsAtPath:thumbnailFilePath]) { [fileManager createDirectoryAtPath:thumbnailFilePath withIntermediateDirectories:YES attributes:nil error:nil]; } if (![fileManager fileExistsAtPath:originalFilePath]) { [fileManager createDirectoryAtPath:originalFilePath withIntermediateDirectories:YES attributes:nil error:nil]; } NSMutableArray <UIImage *>*images = [@[] mutableCopy]; BOOL flag = NO; for (NSInteger i = 0; i < results.count; i++) { LFResultObject *result = results[i]; if ([result isKindOfClass:[LFResultImage class]]) { LFResultImage *resultImage = (LFResultImage *)result; NSLog(@"resultImage.originalImage:%@", resultImage.originalImage); NSInteger i = 0; // for(i = 0; i<photos.count;i++) if(resultImage.originalImage) { flag = YES; // UIImage *image = photos[i]; self.model.imageData = resultImage.originalData; self.model.image = resultImage.originalImage;// [self getCompressImageWithImage:resultImage.originalImage]; self.model.dyFileType = DYFileTypeImage; [self excuteQA_UploadCommand]; } } else if ([result isKindOfClass:[LFResultVideo class]]) { LFResultVideo *resultVideo = (LFResultVideo *)result; if(resultVideo.data) { flag = YES; self.model.imageData = resultVideo.data; self.model.image = [self getCompressImageWithImage:resultVideo.coverImage]; //resultVideo.coverImage; self.model.dyFileType = DYFileTypeVideo; [self excuteQA_UploadCommand]; } NSLog(@"🎉🚀Info name:%@ -- infoLength:%fK -- videoLength:%fK -- infoSize:%@", resultVideo.info.name, resultVideo.info.byte/1000.0, resultVideo.data.length/1000.0, NSStringFromCGSize(resultVideo.info.size)); } else { /** 无法处理的数据 */ NSLog(@"%@", result.error); } } }
图像或视频上传，然后把图片地址和图片，类型封装DYTextAttachment对象插入UITextView的textStorage并移动光标。至于删除通过键盘的删除键操作就可以了。
-(void)excuteQA_UploadCommand { @weakify(self); NSMutableDictionary *dict = [NSMutableDictionary dictionary]; [dict setObject:[DataStore sharedDataStore].UID forKey:@"UID"]; [BITLoadingView show]; [[NetWorkEngine shareNetWorkEngine] postDataFromServerWithUrlStr:@"http://huaxin.jtaqkt.com/MApi/StudyApi.asmx/QA_Upload" Paremeters:dict isPhoto:(self.model.dyFileType == DYFileTypeImage) data:self.model.imageData successOperation:^(id response) { @strongify(self); [BITLoadingView hide]; CBPShopHomeResultHeadEntity *shopHomeResultHeadEntity = [CBPShopHomeResultHeadEntity mj_objectWithKeyValues:response]; if(1 == shopHomeResultHeadEntity.message) { if(shopHomeResultHeadEntity.data && [shopHomeResultHeadEntity.data isKindOfClass:[NSDictionary class]]) { CBPShopHomeResultHeadEntity *shopHomeResultHeadEntity1 = [CBPShopHomeResultHeadEntity mj_objectWithKeyValues:shopHomeResultHeadEntity.data]; DYTextAttachment *textAttachment = [[DYTextAttachment alloc] init]; textAttachment.dataFilePath = shopHomeResultHeadEntity1.FilePath; textAttachment.image = self.model.image;//[self getCompressImageWithImage:resultImage.originalImage]; textAttachment.emojiSize = CGSizeMake(textAttachment.image.size.width, textAttachment.image.size.height); textAttachment.bounds = CGRectMake(0, 0, textAttachment.image.size.width, textAttachment.image.size.height); // textAttachment.contents = self.model.imageData; textAttachment.dyFileType = self.model.dyFileType; textAttachment.bounds = CGRectMake(0, 0, textAttachment.image.size.width, textAttachment.image.size.height); NSAttributedString *str = [NSAttributedString attributedStringWithAttachment:textAttachment]; //Insert emoji image [self.inputTextView.textStorage insertAttributedString:str atIndex:self.inputTextView.selectedRange.location]; self.inputTextView.selectedRange = NSMakeRange(self.inputTextView.selectedRange.location+1, 0); // [self.rightBarButton setTitleColor:BGColorHex(ED5058) forState:UIControlStateNormal]; self.rightBarButton.userInteractionEnabled = YES; self.describeTitleLabel.hidden = YES; } } else { [[BITNoticeView currentNotice] showErrorNotice:shopHomeResultHeadEntity.messagestr]; } } failoperation:^(NSError *error) { @strongify(self); [BITLoadingView hide]; [[BITNoticeView currentNotice] showErrorNotice:error.domain]; }]; }
为了解决横屏视频的首帧横向显示不全，可以通过图片尺寸压缩显示。当然选取的是图像，第三方控件替你尺寸压缩好了，不用你自己再压缩一遍。
-(UIImage *)getCompressImageWithImage:(UIImage *)image { if(image.size.width > (FULL_WIDTH-COMMON_EDGE_DISTANCE*2)) { // 创建一个bitmap的context // 并把它设置成为当前正在使用的context UIGraphicsBeginImageContext(CGSizeMake((FULL_WIDTH-COMMON_EDGE_DISTANCE*2), (FULL_WIDTH-COMMON_EDGE_DISTANCE*2)*image.size.height/image.size.width)); [image drawInRect:CGRectMake(0, 0, (FULL_WIDTH-COMMON_EDGE_DISTANCE*2) , (FULL_WIDTH-COMMON_EDGE_DISTANCE*2)*image.size.height/image.size.width)]; // 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(); NSData *data = UIImageJPEGRepresentation(newImage, 0.8); // self.model.imageData = data; UIImage *image1 = [UIImage imageWithData:data]; return image1; } else { self.model.imageData = UIImageJPEGRepresentation(image, 0.8); return image; } }
