Add a UIView with a XIB

XIBView.m

@interface XIBView()

/// The main view in the xib file.
@property (strong, nonatomic) IBOutlet UIView *contianerView;

@end

@implementation XIBView

#pragma mark - SetUp

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

- (instancetype)initWithCoder:(NSCoder *)aDecoder {
    self = [super initWithCoder:aDecoder];
    if (self) {
        [self setUp];
    }
    return self;
}
- (void)setUp {
    [self xibSetUp];
    [self viewSetUp];
}

- (void)xibSetUp {
    // Add the xib view to this view
    [[NSBundle mainBundle] loadNibNamed:@"XIBView" owner:self options:nil];
    
    // Make the view stretch with containing view
    _contianerView.autoresizingMask = (UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight);
    
    // Add the container to the current view
    [self addSubview: self.contianerView];
    _contianerView.frame = self.bounds;
}

- (void)viewSetUp {
    self.layer.cornerRadius = 4.0;
}

@end