objective c - Importing view controllers for delegation not working -

-

i have view controller, firstviewcontroller, subclass, fourthviewcontroller. firstviewcontroller's interface is:

#import "fourthviewcontroller.h" @interface firstviewcontroller : uiviewcontroller <fourthviewcontrollerdelegate>

in fourthviewcontroller's .h, have:

#import "firstviewcontroller.h"  @protocol fourthviewcontrollerdelegate -(void) updatelabel; @end  @interface fourthviewcontroller : firstviewcontroller   @property (weak, nonatomic) id<fourthviewcontrollerdelegate>delegate;

this giving me error message: cannot find interface declaration of 'firstviewcontroller', superclass of 'fourthviewcontroller' i'm not sure why error occuring. advice help.

is keeping delegate in same .h file controller critical you? pulled separate .h file , whole thing worked me. this:

//firstviewcontroller.h #import <foundation/foundation.h>  #import "fourthviewcontrollerdelegate.h" @interface firstviewcontroller : uiviewcontroller <fourthviewcontrollerdelegate> @end  //fourthviewcontrollerdelegate.h #import <foundation/foundation.h>  @protocol fourthviewcontrollerdelegate <nsobject> -(void) updatelabel; @end  //fourthviewcontroller.h #import <foundation/foundation.h>  #import "firstviewcontroller.h" #import "fourthviewcontrollerdelegate.h"  @interface fourthviewcontroller : firstviewcontroller  @property (weak, nonatomic) id<fourthviewcontrollerdelegate>delegate; @end

Comments

Post a Comment

Popular posts from this blog

Issues changing the value of an element in an array in matlab -

-
i'm trying create program sum n-1 , n-2 numbers create n , store value in array. currently, output (assuming numdisp > 2 ) num1 , num2 , 0 , 0 , 0 ... size of array correct, i'm having issues reassigning elements. num1 = input('input first integer of fibonacci sequence: '); num2 = input('input second integer of fibonacci sequence: '); numsdisp = input('how many integers display? --> '); list = zeros(numsdisp,1); list(1) = num1; list(2) = num2; if (numsdisp <=0) disp('value must integer greater zero.') elseif (numsdisp == 1) disp(num1) elseif (numsdisp == 2) disp(num1) disp(num2) else disp(num1) disp(num2) index = 3:numsdisp disp(list(index)) list(index) = list((index-1)) + list((index-2)); end end example input: 3 3 4 corresponding output: 3 3 0 0 you aren't printing out final result, intermediate steps. in for loop, printing list(index) updating value, rather updat...
Read more

php - MySQLi binding parameters in a prepared statement doesn't work unless inserted after "WHERE" -

-
i have php code pulls info database. uses prepared statement, works fine written below: <?php $n = '5'; if ($stmt = $connection->prepare("select title items id = ?")) { $stmt->bind_param("s", $n); $stmt->execute(); $stmt->bind_result($title); while ($stmt->fetch()) { echo $title; } $stmt->close(); } ?> and let's echo "batman". however, when move placeholder here: "select ? items id = 5" and change: $n = 'title'; instead of echoing "batman", echoes "title". not possible use placeholder select parameter? what have done this: select "title" items id = 5 you cant use prepared statement bindings identifiers, parameters.
Read more

vb.net - Alternative to the T-SQL AS keyword -

-
please see code below: imports system.data.sqlclient imports system.configuration public class form1 private _constring string private sub form1_load(byval sender object, byval e system.eventargs) handles me.load dim objdr sqldatareader dim objcommand sqlcommand dim objcon sqlconnection dim id integer try _constring = configurationmanager.connectionstrings("testconnection").tostring objcon = new sqlconnection(_constring) objcommand = new sqlcommand("select person.urn, car.urn person inner join car on person.urn = car.urn , personid=1") objcommand.connection = objcon objcon.open() objdr = objcommand.executereader(connectionstate.closed) while objdr.read id = objdr("urn") 'line 19 loop objdr.close() ...
Read more