How to set default values for IBInspectable in Objective-C?

Since IBInspectable values are set after initWithCoder: and before awakeFromNib:, you can set the defaults in initWithCoder: method.

@interface MyView : UIView
@property (copy, nonatomic) IBInspectable NSString *myProp;
@property (assign, nonatomic) BOOL createdFromIB;
@end

@implementation MyView

- (id)initWithCoder:(NSCoder *)aDecoder {
    self = [super initWithCoder:aDecoder];
    if(self != nil) {
        self.myProp = @"foo";
        self.createdFromIB = YES;
    }
    return self;
}

- (void)awakeFromNib {
    if (self.createdFromIB) {
        //add anything required in IB-define way
    }
    NSLog(@"%@", self.myProp);
}

@end

I wrote my code like this. It works pretty well for me, both when designing in the interface builder or running as a app.

@interface MyView : UIView

@property (copy, nonatomic) IBInspectable propertyType *propertyName;

@end

- (void)makeDefaultValues {
    _propertyName = defaultValue;
    //Other properties...
}

- (instancetype)initWithFrame:(CGRect)frame {
    if (self = [super initWithFrame:frame]) {
        [self makeDefaultValues];
    }
    return self;
}

- (instancetype)initWithCoder:(NSCoder *)aDecoder {
    if (self = [super initWithCoder:aDecoder]) {
        [self makeDefaultValues];
    }
    return self;
}