Adding IBOulets to custom UIView subclass crashes 'is not key-value compliant' - ios

Question

I have created two different subviews EPStudentProgressOpenQuestion and EPStudentProgressMultipleChoiceQuestion. They both inherit from EPStudentProgressQuestion as they both subviews share some common information and behaviours.
Each one of the views has its own XIB file.
Inside EPStudentProgressQuestion there is the following code:
#import "EPStudentProgressQuestion.h"
#interface EPStudentProgressQuestion ()
#property (assign, nonatomic) EPStudentProgressQuestionType questiontype;
#end
#implementation EPStudentProgressQuestion
#pragma mark - UIView lifecycle
- (instancetype)initWityQuestionType:(EPStudentProgressQuestionType)questionType {
self = [super init];
if (self) {
self.questiontype = questionType;
[self setupView];
}
return self;
}
- (instancetype)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
[self setupView];
}
return self;
}
- (instancetype)initWithCoder:(NSCoder *)aDecoder {
self = [super initWithCoder:aDecoder];
if (self) {
[self setupView];
}
return self;
}
#pragma mark - Private methods
- (void)setupView {
NSBundle *bundle = [NSBundle bundleForClass:[self class]];
UIView *view = [[bundle loadNibNamed:[self nibNameForQuestionType] owner:[self class] options:nil] firstObject];
view.frame = self.bounds;
[self.layer setCornerRadius:2.f];
[self.layer setBorderWidth:1.f];
[self.layer setBorderColor:[UIColor colorWithWhite:232/255.f alpha:1.f].CGColor];
[self setClipsToBounds:YES];
[self setTranslatesAutoresizingMaskIntoConstraints:NO];
[self addSubview:view];
}
- (NSString*)nibNameForQuestionType {
switch (self.questiontype) {
case EPStudentProgressQuestionTypeOpen:
return #"EPStudentProgressOpenQuestion";
case EPStudentProgressQuestionTypeMultipleChoice:
return #"EPStudentProgressMultipleChoiceQuestion";
}
}
As you can see, very simple code.
As I said above, each EPStudentProgressQuestion view has its own XIB file, connecting the Files Owner through the Identity Inspector class.
This is EPStudentProgressOpenQuestion:
#import "EPStudentProgressOpenQuestion.h"
#interface EPStudentProgressOpenQuestion ()
#property (weak, nonatomic) IBOutlet UILabel *lblQuestion;
#end
#implementation EPStudentProgressOpenQuestion
#end
Exactly the same for EPStudentProgressMultipleChoiceQuestion just without any IBOutlet. But as soon as I create IBOutlets to any of those views, I get the error ... IBOutlet is not key-value compliant...
Without the IBOutlets everything works fine. Each view loads correctly and it's well placed in the view I want to. But as soon as I link some IBOutlets from the XIB to the corresponding class, it crashes...
This is the crash:
*** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<EPStudentProgressQuestion 0x1020196b0> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key lblQuestion.'
And this is how I instantiate the EPStudentProgressQuestion view:
EPStudentProgressOpenQuestion *questionView = [[EPStudentProgressOpenQuestion alloc] initWityQuestionType: EPStudentProgressQuestionTypeOpen];
[self.vQuestionsContainer addSubview:questionView];
Any idea on how to be able to link IBOutlets without having problems?
Thank you in advance!!
EDIT:
If I change the bundle and owner classes as follows:
NSBundle *bundle = [NSBundle bundleForClass:[EPStudentProgressOpenQuestion class]];
NSArray *views = [bundle loadNibNamed:[self nibNameForQuestionType] owner:[EPStudentProgressOpenQuestion class] options:nil];
UIView *view = [views firstObject];
I get the same error but instead of EPStudentProgressQuestion I get the error for EPStudentProgressOpenQuestion...
EDIT 2:
Test project link: https://mega.nz/#!oBhWkawC!RSOzrPOfq_UTVWd3jraRkneuCIyIkS61PKGeca2Bilc

Answer 1

The problem that's crashing you is that you are passing [self class] instead of just self as the nib owner. Change your nib loading line to this:
NSArray *views = [bundle loadNibNamed:[self nibNameForQuestionType] owner:self options:nil];
You have another problem which is that you're loading the nib twice. In initWityQuestionType:, you call [super init]. What you don't realize is -[UIView init] calls [self initWithFrame:CGRectZero]. So you end up calling into your overridden initWithFrame:, which calls setupView. Then when it returns back to initWityQuestionType:, that also calls setupView.
I recommend you get rid of your initWithFrame: override entirely.

Answer 2

Your crash indicates that EPStudentProgressQuestion (your superclass) is not key-value compliant. This means at the point where you are accessing the IBOutlet you have a reference to EPStudentProgressQuestion instead of either EPStudentProgressOpenQuestion or EPStudentProgressMultipleChoiceQuestion.
Just check the code where you are using the new IBOutlets and either change the type of the variable used there or add a cast to the correct class.

Answer 3

Your view controller may have the wrong class in your xib. Please change the UIView class name not the in the File's Owner like the pic
Also you called a [self setup] method in:
- (instancetype)initWityQuestionType:(EPStudentProgressQuestionType)questionType {
self = [super init];
if (self) {
self.questiontype = questionType;
[self setupView];
}
return self;
}
You don't need to call it again
- (instancetype)initWithFrame:(CGRect)frame {
}
and
- (instancetype)initWithCoder:(NSCoder *)aDecoder {
}
it is creating a init loop and causing a memory leak.