NSMutableAttributedString subclass recognizes no selectors, even without modification?

Question

I am trying to subclass NSMutableAttributedString, but I have found I am incapable of using it in any shape or form. Even as a freshly created subclass, it cannot be initialized:

The exception I receive is as follows:

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[ALCTMutableAttributedString initWithString:]: unrecognized selector sent to instance 0x16d21680'

It won't even work with a bare initialization call:

ALCTMutableAttributedString *newString = [[ALCTMutableAttributedString alloc]init];

And here is the bare contents of the Subclass:

Header File:

#import <Foundation/Foundation.h>

@interface ALCTMutableAttributedString : NSMutableAttributedString

@end

Implementation File:

#import "ALCTMutableAttributedString.h"

@implementation ALCTMutableAttributedString

@end

I'm pretty perplexed as to why this is disallowed, or not possible within my project. Might anyone know why?

Extension:

To demonstrate how I'm using the class, here is the header of the class in which I use it:

#import <UIKit/UIKit.h>
#import "Foundation/Foundation.h"
#import "CXCommentLabel.h"
#import "ALCTMutableAttributedString.h"

@interface CXPodcastViewController : UIViewController

@property (nonatomic,weak)IBOutlet CXCommentLabel *commentLabel;

@property (nonatomic,weak)IBOutlet NSLayoutConstraint *commentLabelHeightConstraint;

@property (nonatomic,weak)IBOutlet UIButton *resizeButton;

-(IBAction)resizeTheLabel:(id)sender;

@end

Here is how I call it: (.m file)

-(void)resizeTheLabel:(id)sender {
    // Crash here
    ALCTMutableAttributedString *newString = [[ALCTMutableAttributedString alloc]init];
    // Crash here ^
    [self.commentLabel setAttributedText:newString];
}

Answer 1

Check this Apple document ", In the apple documentation itself there s a section called "Alternatives to Subclassing" please check that too"

Subclassing of string using NSMutableAttributedString is not possible.

Alternative way to use the nsmutableattributed string is

-(void)resizeTheLabel:(id)sender {

  NSMutableAttributedString* attrStr = [[NSMutableAttributedString alloc] initWithString:@"string" attributes:@{NSForegroundColorAttributeName:[UIColor blackColor]}];

  [self.commentLabel setAttributedText:newString];

}

Add the desired attribute to the dictionary and pass it as a parameter. Happy Coding :)