iOS 系统分享

// 1、设置分享的内容，并将内容添加到数组中
    NSArray *activityItemsArray = @[self.model.content];
    NSArray *activityArray = @[];
    
    // 2、初始化控制器，添加分享内容至控制器
    UIActivityViewController *activityVC = [[UIActivityViewController alloc]initWithActivityItems:activityItemsArray applicationActivities:activityArray];
    activityVC.modalInPopover = YES;
    // 3、设置回调
    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、调用控制器
    [self presentViewController:activityVC animated:YES completion:nil];