swift - Searching for objects matching a particular type -

-

i've got nsviewcontroller extension iterates through descendant child view controllers looking first view controller passes particular test (specified user-defined block):

extension nsviewcontroller {      func descendantviewcontrollerpassingtest(test: (viewcontroller: nsviewcontroller) -> bool) -> nsviewcontroller? {         var retval: nsviewcontroller?         childviewcontroller in childviewcontrollers {             if test(viewcontroller: childviewcontroller) {                 retval = childviewcontroller             } else if let descendantviewcontroller = viewcontroller.descendantviewcontrollerpassingtest(test)  {                 retval = descendantviewcontroller             }             if retval != nil { break }         }         return retval     } }

ninety-nine percent of time tests consist of simple type-check...

contentviewcontroller.descendantviewcontrollerpassingtest {$0 outlineviewcontroller}

...so i'd create short convenience extension this:

extension nsviewcontroller {     func descendantviewcontrollermatchingtype(type: what_here?) {         return descendantviewcontrollerpassingtest({ $0 what_here? })     } }

but can't work out type parameter type should be. i've tried anyclass , anyobject compiler informs me these aren't types:

enter image description here

closures i'd use. pass in object closure return type of bool. use closure match descendant recursively.


Comments

Post a Comment

Popular posts from this blog

sequelize.js - Sequelize group by with association includes id -

-
so when requesting group sequelize follows: return models.workingcalendar .findall({ attributes: [ 'workingcalendar.periodid', 'workingcalendar.date', 'period.name' ], include: [ { model: models.period, attributes: [] } ], where: { getsudoid: currentgetsudo.id, unitplantid: unitplantid }, group: ['workingcalendar.periodid', 'workingcalendar.date', 'period.name'], }); sequelize run query: select [workingcalendar].[id], [workingcalendar].[periodid], [workingcalendar].[date], [period].[name] [workingcalendars] [workingcalendar] left outer join [periods] [period] on [wor...
Read more

delphi - Take screenshot in webcam using VFrames in Console Application -

-
i'm doing program take picture of webcam using delphi xe2 , vframes achieve this, problem have figured out, in graphic application works fine, when use unit in console application, returns me error saying first chance exception @ $76b6b727. exception class eaccessviolation message 'access violation @ address 004a271b in module 'console.exe'. read of address 00000260'. process console.exe (3676) my unit : unit webcam; interface uses sysutils, windows, vcl.imaging.jpeg, vcl.graphics, vsample, vframes, classes; type twebcam = class private procedure newvideoframeevent(sender: tobject; width, height: integer; dataptr: pointer); public constructor create; destructor destroy; override; procedure capture_webcam(take_name: string); end; var web_image: tvideoimage; name_screen: string; implementation constructor twebcam.create; begin inherited create; end; destructor twebcam.destroy; begin inherited destroy; end; ...
Read more

ubuntu - Executors lost when starting pyspark in YARN client mode -

-
i able run pyspark in yarn client mode in laptop , trying setup in laptop. however, time can't running. when try start pyspark in yarn client mode, gives me following error. using dynamic resource allocation, have set spark_executor_memory less yarn container memory. using hadoop 2.6.4, spark 1.6.1, ubuntu 15.10 is possible error due network issues? 16/06/12 01:49:34 info scheduler.dagscheduler: executor lost: 1 (epoch 0) in [1]: 16/06/12 01:49:34 info cluster.yarnclientschedulerbackend: disabling executor 1. 16/06/12 01:49:34 info storage.blockmanagermasterendpoint: trying remove executor 1 blockmanagermaster. 16/06/12 01:49:34 info storage.blockmanagermasterendpoint: removing block manager blockmanagerid(1, 192.168.2.16, 37900) 16/06/12 01:49:34 error client.transportclient: failed send rpc 9123554941984942265 192.168.2.16/192.168.2.16:47630: java.nio.channels.closedchannelexception java.nio.channels.closedchannelexception 16/06/12 01:49:34 info storage.blockmanagermast...
Read more