前言
现在做项目要新加gif的上传，显示和保存到相册，之前以为挺简单的就改个后缀，💔💔💔
gif的上传
1.从相册获取gif图片
先判断获取的图片中有没有gif进行不同的业务逻辑处理，比如图片会加滤镜之类的
[WJTZImageManager showGifImagePhotoWithController:self count:9 finishBlock:^(NSArray<UIImage *> *photos, NSArray *assets, BOOL isSelectOriginalPhoto) {
if ([WJTZImageManager haveGifWithAssetArray:assets]) {
[myself gotoSayPublishControllerWithImageArray:photos assetArray:assets type:MouoPublishSayType];
}else {
[myself gotoFilterControllerWithImageArray:photos assetArray:assets type:MouoPublishSayType];
}
}];
2.NSData数据上传
1.系统自带的UIImage里面转成NSData类型就不是图了所以我们要用以下的转换方法
- (void)getOriginalPhotoDataWithAsset:(id)asset completion:(void (^)(NSData *data,NSDictionary *info,BOOL isDegraded))completion {
if ([asset isKindOfClass:[PHAsset class]]) {
PHImageRequestOptions *option = [[PHImageRequestOptions alloc] init];
option.networkAccessAllowed = YES;
option.resizeMode = PHImageRequestOptionsResizeModeFast;
[[PHImageManager defaultManager] requestImageDataForAsset:asset options:option resultHandler:^(NSData *imageData, NSString *dataUTI, UIImageOrientation orientation, NSDictionary *info) {
BOOL downloadFinined = (![[info objectForKey:PHImageCancelledKey] boolValue] && ![info objectForKey:PHImageErrorKey]);
if (downloadFinined && imageData) {
if (completion) completion(imageData,info,NO);
}
}];
} else if ([asset isKindOfClass:[ALAsset class]]) {
ALAsset *alAsset = (ALAsset *)asset;
ALAssetRepresentation *assetRep = [alAsset defaultRepresentation];
Byte *imageBuffer = (Byte *)malloc(assetRep.size);
NSUInteger bufferSize = [assetRep getBytes:imageBuffer fromOffset:0.0 length:assetRep.size error:nil];
NSData *imageData = [NSData dataWithBytesNoCopy:imageBuffer length:bufferSize freeWhenDone:YES];
if (completion) completion(imageData,nil,NO);
}
}
2.由于是异步的，需要线程同步，我这些了一个方法
+ (void)getDataWithArray:(NSArray *)array finish:(void(^)(NSArray *array))finish {
NSMutableArray *dataArray = [NSMutableArray array];
NSMutableArray *assetArray = [NSMutableArray array];
[array enumerateObjectsUsingBlock:^(id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
if ([obj isKindOfClass:[UIImage class]]) {
[dataArray addObject:UIImageJPEGRepresentation(obj, 0.8)];
}
if ([obj isKindOfClass:[NSData class]]) {
[dataArray addObject:obj];
}
if ([obj isKindOfClass:[PHAsset class]]) {
[assetArray addObject:obj];
}
}];
dispatch_group_t group = dispatch_group_create();
[assetArray enumerateObjectsUsingBlock:^(PHAsset * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
dispatch_group_enter(group);
[[TZImageManager manager] getOriginalPhotoDataWithAsset:obj completion:^(NSData *data, NSDictionary *info, BOOL isDegraded) {
[dataArray addObject:data];
dispatch_group_leave(group);
}];
}];
dispatch_group_notify(group, dispatch_get_global_queue(0, 0), ^{
finish(dataArray);
});
}
3.拿着数据进行上传就行了，最好名称后缀再做个判断是GIF的上传的时候后缀改为.gif，这样的话，如果项目有需要判断GIF的情况可用地址后缀判断
gif保存到本地相册
1.获取网络请求后的NSData
现在网络请请求加载图片一般用SDWebImage和YYWebImage
这边举例YYWebImage
1.使用YYImageCache,传入网络图片地址获取图片缓存
- (nullable NSData *)getImageDataForKey:(NSString *)key;
- (void)getImageDataForKey:(NSString *)key
withBlock:(void(^)(NSData * _Nullable imageData))block;
2.使用YYAnimatedImageView播放GIF的话可以直接抓出NSData数据
YYImage *image = (YYImage *)imageView.image;
//image.animatedImageData
//@property (nullable, nonatomic, readonly) NSData *animatedImageData;
2.将NSData保存到本地相册
- (void)savePhotoWithData:(NSData *)data completion:(void (^)(NSError *error))completion {
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
PHAssetResourceCreationOptions *options = [[PHAssetResourceCreationOptions alloc] init];
options.shouldMoveFile = YES;
PHAssetCreationRequest *request = [PHAssetCreationRequest creationRequestForAsset];
[request addResourceWithType:PHAssetResourceTypePhoto data:data options:options];
request.creationDate = [NSDate date];
} completionHandler:^(BOOL success, NSError * _Nullable error) {
dispatch_sync(dispatch_get_main_queue(), ^{
if (success && completion) {
completion(nil);
} else if (error) {
NSLog(@"保存照片出错:%@",error.localizedDescription);
if (completion) {
completion(error);
}
}
});
}];
}
gif的显示
网上很多第三方框架，这边推荐一个YYAnimatedImageView
