How to custom UIActivity for sharing video in youtube - youtube

Question

when I use UIActivityViewController to share video, the ActivityView display facebook ins Twitter Tumblr etc but there is not youtube so I want to write a custom UIActivity for sharing video in youtube But I my English is too poor to understand YouTube API Documentation 。。。
here is my code
import
#interface RFCustomYoutubeActivity : UIActivity
#end
#import "RFCustomYoutubeActivity.h"
#interface RFCustomYoutubeActivity ()
#property (nonatomic,strong)NSArray *activityItems;
#end
#implementation RFCustomYoutubeActivity
+ (UIActivityCategory)activityCategory {
return UIActivityCategoryShare;
}
- (NSString *)activityType{
NSString *bundeID = [NSBundle mainBundle].bundleIdentifier;
NSString *typeStr =[bundeID stringByAppendingString:NSStringFromClass([RFCustomYoutubeActivity class])];
return typeStr;
}
- (NSString *)activityTitle {
return #"Youtube";
}
- (UIImage *)activityImage {
return [UIImage imageNamed:#"youtube.png"];
}
- (BOOL)canPerformWithActivityItems:(NSArray *)activityItems{
for (NSObject *obj in activityItems) {
if ([obj isKindOfClass:[NSURL class]] ) {
return YES;
}
}
return NO;
}
- (void)prepareWithActivityItems:(NSArray *)activityItems{
NSMutableArray *mutableArray=[NSMutableArray array];
for (NSObject *obj in activityItems) {
if ([obj isKindOfClass:[NSURL class]]) {
[mutableArray addObject:obj];
}
}
self.activityItems=[NSArray arrayWithArray:mutableArray];
}
- (void)performActivity{
//self.activityItems[0] is a video urlPath.
//here i don't konw how to open youtube(app) or share video to youtube
//or how to open youtube album
}
- (void)activityDidFinish:(BOOL)completed{
NSLog(#"end");
}