iOS利用系統分享實現分享視頻功能

1. 先說說自己走的彎路

要使用系統分享，由於之前沒接觸過，上網發現UIActivityViewController可以實現原生分享。UIActivityViewController可以分享文本、圖片、鏈接，

    NSString *textToShare = @"文本內容";
    UIImage *imageToShare = [UIImage imageNamed:@"imagename"];
    NSURL *urlToShare = [NSURL URLWithString:@"http:baidu.com"];
    NSArray *activityItems = @[textToShare, imageToShare, urlToShare];

    UIActivityViewController *activityVC = [[UIActivityViewController alloc]initWithActivityItems:activityItems
                                                                            applicationActivities:nil];
    //不出現在活動項目
    activityVC.excludedActivityTypes = @[UIActivityTypePrint, UIActivityTypeCopyToPasteboard,UIActivityTypeAssignToContact,UIActivityTypeSaveToCameraRoll,UIActivityTypeAddToReadingList];
    
    //給activityVC的屬性completionHandler寫一個block。
    //用以UIActivityViewController執行結束後，被調用，做一些後續處理。
    UIActivityViewControllerCompletionWithItemsHandler myBlock = ^(UIActivityType activityType, BOOL completed, NSArray * returnedItems, NSError * activityError)
    {
        LyLog(@"activityType :%@", activityType);
        if (completed)
        {
            LyLog(@"completed");
        }
        else
        {
            LyLog(@"cancel");
        }
    };
    
    // 初始化completionHandler，當post結束之後（無論是done還是cancell）該blog都會被調用
    activityVC.completionWithItemsHandler = myBlock;
    
    UIViewController * rootVc = [UIApplication sharedApplication].keyWindow.rootViewController;
    [rootVc presentViewController:activityVC animated:TRUE completion:nil];
    

具體使用方法可參考：http://www.jianshu.com/p/a1c9621a3f4e

本來以爲UIActivityViewController 不能分享視頻，經網友cys482提醒，說構建NSURL時採用 [NSURL fileURLWithPath:urlString];就可以分享視頻

然後我試了下

    NSString *textToShare = @"文本內容";
    UIImage *imageToShare = [UIImage imageNamed:@"test"];
    NSURL*urlToShare=  [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"test" ofType:@"mp4"]];
    NSArray *activityItems = @[textToShare,imageToShare,urlToShare];
    

然後出現

然後修改activityItems 只包含url

    NSString *textToShare = @"文本內容";
    UIImage *imageToShare = [UIImage imageNamed:@"test"];
    NSURL*urlToShare=  [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"test" ofType:@"mp4"]];
    NSArray *activityItems = @[urlToShare];
    

bing~go ，分享成功！！！

2. UIDocumentInteractionController 具有預覽和分享的功能

 NSURL * url = [NSURL fileURLWithPath:filePath];
 _documentController = [UIDocumentInteractionController interactionControllerWithURL:url];
 UIViewController * vc = [UIApplication sharedApplication].keyWindow.rootViewController;
 [self.documentController presentOpenInMenuFromRect:[UIScreen mainScreen].bounds  inView:vc.view animated:YES];
 self.documentController.delegate = self;

其中filePath是視頻文件地址

UIDocumentInteractionController的用法具體可參考：http://www.jianshu.com/p/3f03897cf98a

3.另外需要注意的地方

當彈出分享列表，但是點擊第三方平臺按鈕沒有響應是，去設置裏面看下

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