UIActivityViewController 系统社交化 共享

1.UIActivityViewController是继承自UIViewController，是拥有VC的特性

   a.初始化 init  ， initWithActivityItems:applicationActivities

UIActivityViewController *activity = [[UIActivityViewController alloc] initWithActivityItems:@[@"Steve Jobs by waiter lsaacson"] applicationActivities:nil];

  b.点击某个选项之后所能处理的操作 completionWithItemsHandler(Block, >8.0) completionHandler(Block, <8.0）

activity.completionWithItemsHandler = ^(NSString * __nullable activityType, BOOL completed, NSArray * __nullable returnedItems, NSError * __nullable activityError){
        NSLog(@"hahahhahaha");
        if (completed) {
            NSLog(@"completed");
        }else{
            NSLog(@"cancel");
        }
    };

 c.剔除不需要的操作项  excludedActivityTypes

//该属性 表示去掉不想显示的按钮
    activity.excludedActivityTypes = @[UIActivityTypeAirDrop,UIActivityTypeMessage];

 d.展示改控制器     (中间一栏的分享型服务,下面一栏的操作型服务)

[self.navigationController presentViewController:activity animated:YES completion:nil];
    
     /*
      [self.navigationController pushViewController:activity animated:YES]; 会报错
      Snapshotting a view that has not been rendered results in an empty snapshot.
      Ensure your view has been rendered at least once before snapshotting or snapshot after screen updates.
      */

2.自定义选项 Item (UIActivity子类即可)

#import <UIKit/UIKit.h>

@interface HGLActivity : UIActivity

@end

#import "HGLActivity.h"
 NSString *const UIActivityTypeHGLCustomMine = @"HGLCustomActivityMine";
@implementation HGLActivity

// default returns nil. subclass may override to return custom activity type that is reported to completion handler
- (NSString *)activityType{
    return UIActivityTypeHGLCustomMine;
}


// default returns nil. subclass must override and must return non-nil value
- (NSString *)activityTitle{ //展示的问题介绍
    return NSLocalizedString(@"HGL Custom", @"");
}


// default returns nil. subclass must override and must return non-nil value
- (UIImage *)activityImage{  //展示的图标
    UIImage *im = [UIImage imageNamed:@"xl"];
    return im;
}

//可以被响应
- (BOOL)canPerformWithActivityItems:(NSArray *)activityItems{
    return YES;
}

- (void)prepareWithActivityItems:(NSArray *)activityItems{
    NSLog(@"prepareWithActivityItems");
    //点击图片之后触发
//    UIActivityViewController 传递的 activityItems
}

- (void)performActivity{
    NSLog(@"performActivity");
//    调用prepareWithActivityItems 之后出发
}

+ (UIActivityCategory)activityCategory{
//    return UIActivityCategoryAction;  //下面一栏的操作型服务
    return UIActivityCategoryShare ;  //中间一栏的分享型服务
}

@end

  *初始化是UIActivityViewController 最后一个参数为数组

UIActivityViewController *activity = [[UIActivityViewController alloc] initWithActivityItems:@[@"Steve Jobs by waiter lsaacson",[[NSBundle mainBundle] URLForResource:@"hgl29" withExtension:@"txt"]] applicationActivities:@[[[HGLActivity alloc]init]]];