iOS文件预览分享小技能示例

/**
enum wxscene {
    wxscenesession  = 0, 
    wxscenetimeline = 1,
    wxscenefavorite = 2,
};
文件真实数据内容
 * @note 大小不能超过10m
 */
@property (nonatomic, retain) nsdata    *filedata;
*/
- (void)sendfilecontent
{
    wxmediamessage *message = [wxmediamessage message];
    message.title = @"ml.pdf";
    message.description = @"pro coredata";
    [message setthumbimage:[uiimage imagenamed:@"res2.jpg"]];
    wxfileobject *ext = [wxfileobject object];
    ext.fileextension = @"pdf";
    nsstring* filepath = [[nsbundle mainbundle] pathforresource:@"ml" oftype:@"pdf"];
    ext.filedata = [nsdata datawithcontentsoffile:filepath];
    //+ (nullable instancetype)datawithcontentsofurl:(nsurl *)url;
    message.mediaobject = ext;
    sendmessagetowxreq* req = [[[sendmessagetowxreq alloc] init]autorelease];
    req.btext = no;
    req.message = message;
    req.scene = wxscenesession;
    [wxapi sendreq:req completion:nil];
}

#pragma mark - umfileobject
/*! @brief 多媒体消息中包含的文件数据对象
 *
 * @see umshareobject
 */
@interface umsharefileobject : umshareobject
/** 文件后缀名
 * @note 长度不超过64字节
 */
@property (nonatomic, retain) nsstring  *fileextension;
/** 文件真实数据内容
 * @note 大小不能超过10m
 */
@property (nonatomic, retain) nsdata    *filedata;
/** 文件的名字(不包含后缀)
 * @note 长度不超过64字节
 */
@property (nonatomic, retain) nsstring  *filename;
@end

- (bool)presentoptionsmenufromrect:(cgrect)rect inview:(uiview *)view animated:(bool)animated;
- (bool)presentoptionsmenufrombarbuttonitem:(uibarbuttonitem *)item animated:(bool)animated;
// bypasses the menu and opens the full screen preview window for the item at url.  returns no if the item could not be previewed.
// note that you must implement the delegate method documentinteractioncontrollerviewcontrollerforpreview: to preview the document.
- (bool)presentpreviewanimated:(bool)animated;//预览文件
// presents a menu allowing the user to open the document in another application.  the menu
// will contain all applications that can open the item at url.
// returns no if there are no applications that can open the item at url.
- (bool)presentopeninmenufromrect:(cgrect)rect inview:(uiview *)view animated:(bool)animated;//包括快速预览菜单、打印、复制
- (bool)presentopeninmenufrombarbuttonitem:(uibarbuttonitem *)item animated:(bool)animated;//不包括包括快速预览菜单

//方式1：
    nsstring* filepath = [[nsbundle mainbundle] pathforresource:@"ml" oftype:@"pdf"];
nsurl *url = [nsurl fileurlwithpath:filepath];
// 方式2
    //nsurl *url = [[nsbundle mainbundle] urlforresource:@"ml" withextension:@"pdf"];

uidocumentinteractioncontroller *documentcontroller = [uidocumentinteractioncontroller interactioncontrollerwithurl:url];
documentcontroller.delegate = self;//uidocumentinteractioncontrollerdelegate

[documentcontroller presentpreviewanimated:yes]; // 预览文件

        cgrect rect = cgrectmake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
       [documentcontroller presentoptionsmenufromrect:rect inview:self.view  animated:yes];//包括快速预览菜单、打印、复制
//        [documentcontroller presentopeninmenufromrect:rect inview:self.view animated:yes];//不包括包括快速预览菜单

#pragma mark - uidocumentinteractioncontrollerdelegate
- (uiviewcontroller *)documentinteractioncontrollerviewcontrollerforpreview:(uidocumentinteractioncontroller *)interactioncontroller{
    return self;
}
//
/**
 print: savetocameraroll:  copy:
 */
- (bool)documentinteractioncontroller:(uidocumentinteractioncontroller *)controller canperformaction:(sel)action{
    nslog(@"canperformaction  %s %@ ", __func__,nsstringfromselector(action));
    //nsstringfromselector(_cmd)  //当前选择器的名字
//    return no;不显示copy print
    return yes;//显示copy print
}
- (bool)documentinteractioncontroller:(uidocumentinteractioncontroller *)controller performaction:(sel)action{
    nslog(@"canperformaction  %s", __func__);
    return yes;//显示copy print
//    return no;
}

- (void)openfile:(crmfilepreviewcellm*)m{
    //        nsurl *relativetourl = [nsurl urlwithstring:m.url ];//必须先下载，否则无法查看文件内容
    [svprogresshud showwithstatus:@"加载中..."];
    nsdata *data = [nsdata datawithcontentsofurl:[nsurl urlwithstring:m.url]];
        [svprogresshud dismiss];
    if(data== nil){
        [svprogresshud showinfowithstatus:@"文件下载失败"];
        return ;
    }
    //            //用单例类 nsfilemanager的对象,将文件写入本地
    nsfilemanager *filemanage = [nsfilemanager defaultmanager];
    nsstring *tmp = [nssearchpathfordirectoriesindomains(nscachesdirectory, nsuserdomainmask, yes) lastobject];
//    nsstring *tmp = nstemporarydirectory();
    nsstring *filename = m.filename;
    tmp =[tmp stringbyappendingpathcomponent:filename];
    bool issuccess = [filemanage createfileatpath:tmp contents:data attributes:nil];
    if(issuccess){
            nsurl *url = [nsurl fileurlwithpath:tmp];
        uidocumentinteractioncontroller *documentcontroller = [uidocumentinteractioncontroller interactioncontrollerwithurl:url];
        //uidocumentinteractioncontroller delegate must implement documentinteractioncontrollerviewcontrollerforpreview: to allow preview
        documentcontroller.delegate = self;//uidocumentinteractioncontrollerdelegate
        [documentcontroller presentpreviewanimated:yes]; // 预览文件
    }
}
#pragma mark - uidocumentinteractioncontrollerdelegate
- (uiviewcontroller *)documentinteractioncontrollerviewcontrollerforpreview:(uidocumentinteractioncontroller *)interactioncontroller{
    return self;
}
//
/**
 print: savetocameraroll:  copy:
 */
- (bool)documentinteractioncontroller:(uidocumentinteractioncontroller *)controller canperformaction:(sel)action{
    nslog(@"canperformaction  %s %@ ", __func__,nsstringfromselector(action));
    //nsstringfromselector(_cmd)  //当前选择器的名字
//    return no;不显示copy print
    return yes;//显示copy print
}
- (bool)documentinteractioncontroller:(uidocumentinteractioncontroller *)controller performaction:(sel)action{
    nslog(@"canperformaction  %s", __func__);
    return yes;//显示copy print
//    return no;
}

    //        nsurl *relativetourl = [nsurl urlwithstring:m.url ];//必须先下载，否则无法查看文件内容
- (nsstring *)filepathfromurl{
    if(_filepathfromurl !=nil){
        return _filepathfromurl;
    }
    nsdata *data = [nsdata datawithcontentsofurl:[nsurl urlwithstring:self.url]];
    if(data== nil){
        [svprogresshud showinfowithstatus:@"文件下载失败"];
        return nil;
    }
    //            //用单例类 nsfilemanager的对象,将文件写入本地
    nsfilemanager *filemanage = [nsfilemanager defaultmanager];
    nsstring *tmp = [nssearchpathfordirectoriesindomains(nscachesdirectory, nsuserdomainmask, yes) lastobject];
//    nsstring *tmp = nstemporarydirectory();
    nsstring *filename = self.filename;
    tmp =[tmp stringbyappendingpathcomponent:filename];
    bool issuccess = [filemanage createfileatpath:tmp contents:data attributes:nil];
    _filepathfromurl = tmp;
    if(!issuccess){
        _filepathfromurl = nil;
    }
    return _filepathfromurl;
}

- (void)openfile:(crmfilepreviewcellm*)m{
    if(!m.filepathfromurl){
        return;
    }
            nsurl *url = [nsurl fileurlwithpath:m.filepathfromurl];
        uidocumentinteractioncontroller *documentcontroller = [uidocumentinteractioncontroller interactioncontrollerwithurl:url];
        //uidocumentinteractioncontroller delegate must implement documentinteractioncontrollerviewcontrollerforpreview: to allow preview
        documentcontroller.delegate = self;//uidocumentinteractioncontrollerdelegate
        [documentcontroller presentpreviewanimated:yes]; // 预览文件
}

@property (nonatomic,copy) nsstring *filename;
@property (nonatomic,copy) nsstring *url;
//
@property (nonatomic,copy) nsstring *filepathfromurl;
/**
/** 文件真实数据内容
 * @note微信文件分享 大小不能超过10m
 */
@property (nonatomic, retain) nsdata    *filedata;
- (void)sendfilecontent;
- (nsdata *)filedata{
    if(_filedata==nil){
        nsstring* filepath= [self filepathfromurl];
        _filedata =[nsdata datawithcontentsoffile:filepath];
    }
    return _filedata;
}
- (void)sendfilecontent
{
    wxmediamessage *message = [wxmediamessage message];
    message.title = self.filename;
    message.description =self.filename;
    [message setthumbimage:[uiimage imagenamed:self.iconname]];
    wxfileobject *ext = [wxfileobject object];
    ext.fileextension =self.fileextension;
    ext.filedata =self.filedata;
    //+ (nullable instancetype)datawithcontentsofurl:(nsurl *)url;
    message.mediaobject = ext;
    sendmessagetowxreq* req = [[sendmessagetowxreq alloc] init];
    req.btext = no;
    req.message = message;
    req.scene = wxscenesession;
    [wxapi sendreq:req completion:nil];
}

+ (nullable nsstring *)usercachedirectory {
    nsarray<nsstring *> *paths = nssearchpathfordirectoriesindomains(nscachesdirectory, nsuserdomainmask, yes);
    return paths.firstobject;
}

- (void)removealldata {
    [self.filemanager removeitematpath:self.diskcachepath error:nil];
    [self.filemanager createdirectoryatpath:self.diskcachepath
            withintermediatedirectories:yes
                             attributes:nil
                                  error:null];
}

+ (void)clearwebcachecompletion:(dispatch_block_t)completion {
    if (@available(ios 9.0, *)) {
        nsset *websitedatatypes = [wkwebsitedatastore allwebsitedatatypes];
        nsdate *datefrom = [nsdate datewithtimeintervalsince1970:0];
        [[wkwebsitedatastore defaultdatastore] removedataoftypes:websitedatatypes modifiedsince:datefrom completionhandler:completion];
    } else {
        nsstring *librarydir = nssearchpathfordirectoriesindomains(nslibrarydirectory, nsuserdomainmask, yes)[0];
        nsstring *bundleid  =  [[[nsbundle mainbundle] infodictionary] objectforkey:@"cfbundleidentifier"];
        nsstring *webkitfolderinlib = [nsstring stringwithformat:@"%@/webkit",librarydir];
        nsstring *webkitfolderincaches = [nsstring stringwithformat:@"%@/caches/%@/webkit",librarydir,bundleid];
        nsstring *webkitfolderincachesfs = [nsstring stringwithformat:@"%@/caches/%@/fscacheddata",librarydir,bundleid];
        nserror *error;
        /* ios8.0 webview cache path */
        [[nsfilemanager defaultmanager] removeitematpath:webkitfolderincaches error:&error];
        [[nsfilemanager defaultmanager] removeitematpath:webkitfolderinlib error:nil];
        /* ios7.0 webview cache path */
        [[nsfilemanager defaultmanager] removeitematpath:webkitfolderincachesfs error:&error];
        if (completion) {
            completion();
        }
    }
}

+(void)clearcache:(nsstring *)path{
    nsfilemanager *filemanager=[nsfilemanager defaultmanager];
    if ([filemanager fileexistsatpath:path]) {
        nsarray *childerfiles=[filemanager subpathsatpath:path];
        for (nsstring *filename in childerfiles) {
            //如有需要，加入条件，过滤掉不想删除的文件
            nsstring *absolutepath=[path stringbyappendingpathcomponent:filename];
            [filemanager removeitematpath:absolutepath error:nil];
        }
    }
    //    [[sdimagecache sharedimagecache] cleandisk];
    [[sdimagecache sharedimagecache] cleardiskoncompletion:^{
    }];
}