Objective-c calling a method from class method - ios

Question

I am trying to access an instance method from a class method. I am getting this error
+[ActiveVC goToDashBoard]: unrecognized selector sent to class 0x112010
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '+[ActiveVC goToDashBoard]:
unrecognized selector sent to class 0x112010'
My code
+ (void) removeClosedVisitor:(NSString *) visitorID{
for (NSInteger i = activelist.count - 1; i >= 0 ; i--) {
ActiveItemObject *item = [activelist objectAtIndex:i];
if ([visitorID isEqualToString:item.VisitorId]) {
NSLog(#"Removing Visitor from Active List -- %#", visitorID);
[activelist removeObjectAtIndex:i];
//[self.incommingTable reloadData];
// NSDictionary *activeDictionary = [[NSDictionary alloc] init];
// activeDictionary = [activelist mutableCopy];
//
// [[NSNotificationCenter defaultCenter]
// postNotificationName:#"PassData"
// object:nil
// userInfo:activeDictionary];
[[self class] goToDashBoard];
}
}
}
- (void) goToDashBoard{
NSLog(#"Segue to Dashboard");
UITabBarController *dvc = [self.storyboard instantiateViewControllerWithIdentifier:#"id_tabView"];
[dvc setModalTransitionStyle:UIModalTransitionStyleCoverVertical];
[self presentViewController:dvc animated:YES completion:nil];
}
can some one help me to fix this issue . tnx.

Answer 1

You need to create an instance of your class or convert your class to a singleton. For example: [[ActiveVC sharedInstance] goToDashBoard];
Here's how you create a Singleton Class:
First, create a New file and subclass it from NSObject. Name it anything, we will use CommonClass here. Xcode will now generate CommonClass.h and CommonClass.m files for you.
In your CommonClass.h file:
#import <Foundation/Foundation.h>
#interface CommonClass : NSObject {
}
+ (CommonClass *)sharedObject;
#property NSString *commonString;
#end
In your CommonClass.m File:
#import "CommonClass.h"
#implementation CommonClass
+ (CommonClass *)sharedObject {
static CommonClass *sharedClass = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
sharedClass = [[self alloc] init];
});
return sharedClass;
}
- (id)init {
if (self = [super init]) {
self.commonString = #"this is string";
}
return self;
}
#end

Answer 2

If you want to call instance method then you will need an instance variable so create instance variable of this class and call it.

Answer 3

Make goToDashBoard a class method. Since you are not creating any instance here, if it is not a class method then it can't be executed.
+ (void) goToDashBoard

Answer 4

Do you actually have an instance anywhere? If not you will have to create one:
[self.sharedInstance goToDashBoard]
[[self alloc] init] goToDashBoard]
I assume you do have an instance, because its looks like its a view controller. In which case I suggest you pass the instance into the static method.
+ (void) removeClosedVisitor:(NSString *) visitorID viewController: (xxx) viewController {