iOS开发实现调用原生分享面板分享pdf等文件

需求：银行项目要实现调起iPhone原生面板实现转账流水等PDF文件的分享
代码：
1.首先要在项目的 Build Phases 中导入social.framework
2.在要实现的类中导入头文件 #import <Social/Social.h>
示例代码：

- (void)showNormalActivityShareWithFilePath:(NSURL*)path{

    NSArray *activityItems = @[path];
    UIActivityViewController *activityVC = [[UIActivityViewController alloc] initWithActivityItems:activityItems applicationActivities:nil];
    //__weak typeof(self) weakself = self;
    activityVC.completionWithItemsHandler = ^(UIActivityType  _Nullable activityType, BOOL completed, NSArray * _Nullable returnedItems, NSError * _Nullable activityError) {
//      if (activityType == nil && activityError == nil && completed == NO) {
//          //关闭了分享弹框，给h5回调失败
//       }else if (activityType != nil && completed) {
//               // 分享成功，给h5回调
//
//      }else if (activityType != nil && activityError != nil) {
//               // 操作失败，给h5回调;
//      }else if (activityType != nil && completed == NO) {
//               // 操作失败，给h5回调
//               // 备忘录取消操作
//      }else {
//          //给h5回调
//       }
        //上面判断是写的失败详细内容，若需求不需要这么详细，直接下面这段代码就可以
        if (activityType != nil && completed) {
            //分享成功，给h5回调成功
            [YNETAlertView showStatus:@"分享成功"];
        }else{
            //给h5回调失败
            [YNETAlertView showStatus:@"分享失败"];
        }
    };
        
    [self presentViewController:activityVC animated:YES completion:^{
        
    }];

}

- (void)testMethod{
    //1.通过url下载pdf,存入沙盒调起系统分享面板
    NSString    *fileStr = @"http://xxxxxxxxxx/12.pdf";
    //下载文件
    NSURLRequest * requst = [NSURLRequest requestWithURL:[NSURL URLWithString:fileStr]];
    [YNETProgressHUD show];
    NSURLSessionDownloadTask *download =  [[AFHTTPSessionManager manager] downloadTaskWithRequest:requst progress:^(NSProgress * _Nonnull downloadProgress) {
        NSLog(@"下载进度%f",1.0* downloadProgress.completedUnitCount/downloadProgress.totalUnitCount);
    } destination:^NSURL * _Nonnull(NSURL * _Nonnull targetPath, NSURLResponse * _Nonnull response) {
        NSString *fullPath = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:response.suggestedFilename];
        return [NSURL fileURLWithPath:fullPath];
    } completionHandler:^(NSURLResponse * _Nonnull response, NSURL * _Nullable filePath, NSError * _Nullable error) {
        NSLog(@"下载文件的本地地址%@",filePath);
        [YNETProgressHUD dismiss];
        if (filePath!=nil) {
            [self showNormalActivityShareWithFilePath:filePath];
        }
    }];
    //启动下载任务
    [download resume];
    
    //下面这段代码是模仿跟前端交互，前端传过来base64图片或者有其他文件转成的base64字符串进行解析模拟，一般文件都通过url下载后再调用系统面板，系统会自动解析分享的文件大小、格式，选择能打开文件的APP在面板上展示
    //2.通过base64字符串，转成nadata,再存入沙盒
    //图片转base64
    UIImage *img = [UIImage imageNamed:@"我的背景"];
    NSData  *imgData = UIImagePNGRepresentation(img);
    NSString    *base64Str = [imgData base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];
    //base64转nsdata
    NSData  *showData = [[NSData alloc]initWithBase64EncodedString:base64Str options:NSDataBase64DecodingIgnoreUnknownCharacters];
    //把data写入沙盒
    NSString *documentDirectory = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)lastObject];
    NSString    *path = [NSString stringWithFormat:@"%@/%@",documentDirectory,@"img.png"];
    NSFileManager   *fileManager = [NSFileManager defaultManager];
    BOOL isDir;
    NSLog(@"写入沙盒地址---%@",path);
    //先判断目录是否存在，不存在才创建
    if (![fileManager fileExistsAtPath:path isDirectory:&isDir]) {
        BOOL    res = [fileManager createFileAtPath:path contents:showData attributes:nil];
        if (res) {
            [self showNormalActivityShareWithFilePath:[NSURL fileURLWithPath:path]];
        }
    }
 
    
}

只要url正常下载文件成功，实现上面的方法就可以啦
注意：pdf等文件只能给路径，不然系统面板不会显示微信、微博、QQ这些软件选项