iOS UIActivityViewController系统原生

下面我来介绍一下利用原生UIActivityViewController快速实现QQ和微信分享

1. 创建要分享的数据内容，加在一个数组 ActivityItems里

    NSString *shareText = @"我是title";
   //图片应是加载完成后的image或本地的image，否则可能会出错
    UIImage *shareImage = [UIImage imageNamed:@"shareImage"];
    NSURL *shareUrl = [NSURL URLWithString:@"https://www.jianshu.com/u/15d37d620d5b"];
    NSArray *activityItemsArray = @[shareText,shareImage,shareUrl];

2. 创建分享视图控制器，初始化UIActivityViewController

//第一个参数 分享的内容
//第二个参数 是一个UIActivity对象的数组，代表了应用程序支持的自定义服务。这个参数可以是nil 
- (instancetype)initWithActivityItems:(NSArray *)activityItems applicationActivities:(nullable NSArray<__kindof UIActivity *> *)applicationActivities

    UIActivityViewController *activityVC = [[UIActivityViewController alloc]initWithActivityItems: activityItemsArray applicationActivities:nil];
    activityVC.modalInPopover = YES;
    //去除特定的分享功能 不需要展现的Activity类型
    activityVC.excludedActivityTypes = @[
                                         UIActivityTypePostToFacebook,
                                         UIActivityTypePostToTwitter,
                                         UIActivityTypePostToWeibo,
                                         UIActivityTypeMessage,
                                         UIActivityTypeMail,
                                         UIActivityTypePrint,
                                         UIActivityTypeCopyToPasteboard,
                                         UIActivityTypeAssignToContact,
                                         UIActivityTypeSaveToCameraRoll,
                                         UIActivityTypeAddToReadingList,
                                         UIActivityTypePostToFlickr,
                                         UIActivityTypePostToVimeo,
                                         UIActivityTypePostToTencentWeibo,
                                         UIActivityTypeAirDrop,
                                         UIActivityTypeOpenInIBooks
                                         ];

3. 根据系统版本，设置点击回调

if ([UIDevice currentDevice].systemVersion.floatValue >= 8.0) {  // ios8.0 之后用此方法回调
        UIActivityViewControllerCompletionWithItemsHandler itemsBlock = ^(UIActivityType __nullable activityType, BOOL completed, NSArray * __nullable returnedItems, NSError * __nullable activityError){
            NSLog(@"activityType == %@",activityType);
            if (completed == YES) {
                NSLog(@"completed");
            } else {
                NSLog(@"cancel");
            }
        };
        activityVC.completionWithItemsHandler = itemsBlock;
    } else { // ios8.0 之前用此方法回调
        UIActivityViewControllerCompletionHandler handlerBlock = ^(UIActivityType __nullable activityType, BOOL completed){
            NSLog(@"activityType == %@",activityType);
            if (completed == YES) {
                NSLog(@"completed");
            } else {
                NSLog(@"cancel");
            }
        };
        activityVC.completionHandler = handlerBlock;
    }

4. 根据设备类型使用相应方法展示

• iPad上，必须通过popover 参考
• iPhone和iPodtouch上，必须以模态的方式展现

if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad) {//iPad
        UIBarButtonItem *shareBarButtonItem = self.navigationItem.leftBarButtonItem;
        UIPopoverController *popup = [[UIPopoverController alloc] initWithContentViewController:activityViewController];
        [popup presentPopoverFromBarButtonItem:shareBarButtonItem permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
       
    } else {
       [self presentViewController:activityViewController animated:YES completion:nil];
    }

至此，简单的分享功能就实现完成了，不需要导入微信的SDK。是不是很简单。
自定义UIActivity，主要就是重写父类的方法，以后用到的话再详细介绍。

UIActivityViewController实现系统原生分享
iOS原生分享
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UIActivityViewController原生分享 微信文字 图片 链接，比较详细
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