最近，再开发一个视频分享的小功能，经过一天的折腾，终于搞定了，这里记录一下，供大家参考，如果有更好的方法，请发邮件asdemon235b@126.com。
需求：将程序生成的视频分享到Facebook和Instagram。
目前情况：已经实现了分享图片到Facebook和Instagram。
走的弯路：首先，Instagram对于视频的时长有要求，经测试，目前是3.0s，这就对生成的视频有了新的限制，如果小于这个长度，需要再次循环播放一遍。其次，开始时以为分享图片和视频的实现方式是一样的，后来发现完全不同，浪费了点时间。最后，Facebook和Instagram的视频分享不像图片那样，文件在程序的沙盒内即可，视频必须在系统的Photo App中才能分享，URL必须是aaset url，要知道苹果已经用Photo Framework代替AssetsLibrary了，此处省略三千字。。。 。
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Facebook分享
图片分享
NSData *sharedImageData;
//得到分享数据的data
if ([[self imageMIME] isEqualToString:@"image/gif"]) {
HSKeyboardGIFImage *gifImage = [self gifImage];
if (gifImage.frameCount > 0) {
UIImage *image = [gifImage imageAtIndex:gifImage.frameCount > 1 ? 1 : 0];
sharedImageData = UIImagePNGRepresentation(image);
} else {
self.block(ShareResultStateFailed);
return NO;
}
} else {
sharedImageData = [self emojiData];
}
//使用FB SDK分享
FBSDKSharePhoto *photo = [[FBSDKSharePhoto alloc] init];
photo.image = sharedImage;
photo.userGenerated = YES;
FBSDKSharePhotoContent *content = [[FBSDKSharePhotoContent alloc] init];
content.photos = @[photo];
[FBSDKShareDialog showFromViewController:self.presentController withContent:content delegate:self];
//最后通过代理方法来得到用户是分享还是取消了
- (void)sharer:(id<FBSDKSharing>)sharer didCompleteWithResults:(NSDictionary *)results {
self.block(ShareResultStateSuccessed);
}
- (void)sharer:(id<FBSDKSharing>)sharer didFailWithError:(NSError *)error{
self.block(ShareResultStateFailed);
}
视频分享
官方参考https://developers.facebook.com/docs/sharing/ios。
主要是视频的URL必须是asset url，否则会报错。具体URL见下面代码。代理方法处理同上面的图片。
[FileUtils saveVideoToCameraRollWithFileUrl:[NSURL URLWithString:_emojiPath] completion:^(CameraRollSaveStatus status, NSString *localID) {
if (status == CameraRollSaveStatus_SaveSuccess) {
NSString *urlString = [NSString stringWithFormat:@"assets-library://asset/asset.MP4?id=%@&ext=MP4", [localID componentsSeparatedByString:@"/"].firstObject ];
dispatch_async(dispatch_get_main_queue(), ^{
FBSDKShareVideo *video = [FBSDKShareVideo videoWithVideoURL:[NSURL URLWithString:urlString]];
FBSDKShareVideoContent *content = [[FBSDKShareVideoContent alloc] init];
content.video = video;
[FBSDKShareDialog showFromViewController:self.presentController withContent:content delegate:self];
});
}
else {
self.block(ShareResultStateFailed);
}
}]
Instagram分享
官方参考文档https://www.instagram.com/developer/mobile-sharing/iphone-hooks/，图片说明到是还可以（也许我是对着code看所以清晰），视频分享就不知所云了。
图片分享
//得到分享数据的data
NSData *sharedImageData = ...;
//将数据sharedImageData转成instagram的igo格式文件
if (!imageData || !file) {
return NO;
}
NSString *pathImage = [NSTemporaryDirectory() tringByAppendingPathComponent:"zmojiinstagram.igo"];
NSURL *urlImage = [imageData writeToFile:pathImage atomically:YES] ? [NSURL fileURLWithPath:pathImage] : nil;
if (urlImage == nil) {
self.block(ShareResultStateFailed);
return NO;
}
//使用UIDocumentInteractionController分享图片
NSDictionary *annotation = @{@"InstagramCaption": @""};
BOOL result = [self shareViaInteractionControllerWithURL:urlImage andUTI:@"com.instagram.exclusivegram" andAnnotation:annotation];
return result;
//以下是辅助函数
- (BOOL)shareViaInteractionControllerWithURL:(NSURL *)url andUTI:(NSString *)uti andAnnotation:(id)annotation {
UIDocumentInteractionController *controller;
if (url) {
controller = [UIDocumentInteractionController interactionControllerWithURL:url];
} else {
controller = [[UIDocumentInteractionController alloc] init];
}
if (uti) {
controller.UTI = uti;
}
if (annotation) {
controller.annotation = annotation;
}
controller.delegate = self;
self.interactionController = controller;
UIView *view = self.presentController.view;
CGRect rect = CGRectMake(0, 0, view.bounds.size.width, view.bounds.size.width);
return [controller presentOpenInMenuFromRect:rect inView:view animated:YES];
}
- (void)documentInteractionControllerDidDismissOpenInMenu:(UIDocumentInteractionController *)controller {
self.interactionController = nil;
if (_interactionOptionSelected) {
self.block(ShareResultStateUnknown);
} else {
self.block(ShareResultStateCancelled);
}
_interactionOptionSelected = NO;
}
视频分享
这里需要使用openURL这个API，具体参数https://useyourloaf.com/blog/openurl-deprecated-in-ios10/。
思路是这样的：由于只允许分享相册中的视频，我们需要把自己的视频存入相册（需要权限），然后拿到这个视频的asset url，使用URL Scheme来分享视频，url为：instagram://library?AssetPath=%@&InstagramCaption=%@，%@为占位符。与Facebook SDK比这个就不知道用户是分享了还是取消了。
if ([[NSFileManager defaultManager] fileExistsAtPath:_emojiPath]) {
//先将文件写入系统相册中，结束后使用PHAsset的localIdentifier转化成asset url
[FileUtils saveVideoToCameraRollWithFileUrl:[NSURL URLWithString:_emojiPath] completion:^(CameraRollSaveStatus status, NSString *localID) {
if (status == CameraRollSaveStatus_SaveSuccess) {
NSString *instagramURL = [NSString stringWithFormat:@"instagram://library?AssetPath=%@&InstagramCaption=%@",[self encodeToPercentEscapeString:(NSString *)[localID componentsSeparatedByString:@"/"].firstObject],[self encodeToPercentEscapeString:@""]];
[self openScheme:instagramURL];
self.block(ShareResultStateSuccessed);
}
else {
self.block(ShareResultStateFailed);
}
}];
return NO;
}
else {
self.block(ShareResultStateFailed);
return NO;
}
//以下是辅助函数
- (void)openScheme:(NSString *)scheme {
UIApplication *application = [UIApplication sharedApplication];
NSURL *URL = [NSURL URLWithString:scheme];
if ([application respondsToSelector:@selector(openURL:options:completionHandler:)]) {
[application openURL:URL options:@{}
completionHandler:^(BOOL success) {
NSLog(@"Open %@: %d",scheme,success);
}];
} else {
BOOL success = [application openURL:URL];
NSLog(@"Open %@: %d",scheme,success);
}
}
-(NSString *)encodeToPercentEscapeString:(NSString *)string {
return (NSString *)CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(NULL,
(CFStringRef) string,
NULL,
(CFStringRef) @"!*'();:@&=+$,/?%#[]",
kCFStringEncodingUTF8));
}
-(NSString *)decodeFromPercentEscapeString:(NSString *)string {
return (NSString *)CFBridgingRelease(CFURLCreateStringByReplacingPercentEscapesUsingEncoding(NULL,
(CFStringRef) string,
CFSTR(""),
kCFStringEncodingUTF8));
}
总之，需要将视频放入系统相册才能分享。这真坑