Custom UIView not loading XIB

Question

I am trying to add customized UIView XIB, but its crashing when fetching NIB.

UIView class .h

#import <UIKit/UIKit.h>

NS_ASSUME_NONNULL_BEGIN

@interface DatesView : UIView

@property (weak, nonatomic) IBOutlet UIView *contentView;

@property (weak, nonatomic) IBOutlet UILabel *fromDateLabel;
@property (weak, nonatomic) IBOutlet UILabel *fromMonthYearLabel;
@property (weak, nonatomic) IBOutlet UILabel *fromDayLabel;



@property (weak, nonatomic) IBOutlet UILabel *toDateLabel;
@property (weak, nonatomic) IBOutlet UILabel *toonthYearLabel;
@property (weak, nonatomic) IBOutlet UILabel *toDayLabel;

@end

UIView class .m

#import "DatesView.h"

@implementation DatesView

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

-(id)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
        [self initializeSubviews];

    }
    return self;
}
-(void)initializeSubviews {
    self.backgroundColor = [UIColor clearColor];

    NSBundle *bundle = [[[NSBundle mainBundle]loadNibNamed:@"DatesView" owner:self options:nil]firstObject];
    [self addSubview:self.contentView];

    self.contentView.frame = self.bounds;

}



@end

Xib

A crash report in console

Unknown class _TtC3EVA9DatesView in Interface Builder file.

This is where it's stopping the execution

Why **Module** is `none` ?? Select on option **Inherit Module From Target**. Clean and run your project. — dahiya_boy, Jan 30 '20 at 12:48
Thanks @dahiya_boy, your suggestion is helpful, now its leading crash at another line, saying " Unknown class _TtC3EVA9DatesView in Interface Builder file." — Code cracker, Jan 30 '20 at 13:03
@Codecracker Make sure `File's Owner` is assigned. And edit your question with current status. Might be this helpful -> https://stackoverflow.com/questions/24924966/xcode-6-bug-unknown-class-in-interface-builder-file — dahiya_boy, Jan 30 '20 at 13:40

score 1 · Accepted Answer · answered Jan 30 '20 at 16:26

There are multiple approaches to instantiating views from xib files. One common issue is assigning the Class to the wrong thing.

Using your code, make sure you have assigned the class to File's Owner:

Here's a simplified example from your image / code:

DatesView.xib source

<?xml version="1.0" encoding="UTF-8"?>
<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="15505" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES">
    <device id="retina4_7" orientation="portrait" appearance="light"/>
    <dependencies>
        <deployment identifier="iOS"/>
        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="15510"/>
        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
    </dependencies>
    <objects>
        <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner" customClass="DatesView">
            <connections>
                <outlet property="contentView" destination="iN0-l3-epB" id="Yhm-Z4-6Rd"/>
                <outlet property="fromDateLabel" destination="cfP-lM-bLV" id="QeZ-ly-bag"/>
                <outlet property="toDateLabel" destination="WGv-5C-gVM" id="Wl6-DR-OuA"/>
            </connections>
        </placeholder>
        <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
        <view contentMode="scaleToFill" id="iN0-l3-epB">
            <rect key="frame" x="0.0" y="0.0" width="375" height="76"/>
            <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
            <subviews>
                <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="1000" text="From Label" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="cfP-lM-bLV">
                    <rect key="frame" x="8" y="8" width="134" height="33.5"/>
                    <color key="backgroundColor" red="0.99953407049999998" green="0.98835557699999999" blue="0.47265523669999998" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                    <fontDescription key="fontDescription" type="system" pointSize="28"/>
                    <nil key="textColor"/>
                    <nil key="highlightedColor"/>
                </label>
                <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="To Label" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="WGv-5C-gVM">
                    <rect key="frame" x="266.5" y="8" width="100.5" height="33.5"/>
                    <color key="backgroundColor" red="0.97305089235305786" green="0.92194973774024858" blue="0.86304229628289908" alpha="1" colorSpace="custom" customColorSpace="displayP3"/>
                    <fontDescription key="fontDescription" type="system" pointSize="28"/>
                    <nil key="textColor"/>
                    <nil key="highlightedColor"/>
                </label>
            </subviews>
            <color key="backgroundColor" red="0.78049301826098361" green="0.95023679298999175" blue="1" alpha="1" colorSpace="custom" customColorSpace="displayP3"/>
            <constraints>
                <constraint firstItem="vUN-kp-3ea" firstAttribute="bottom" secondItem="cfP-lM-bLV" secondAttribute="bottom" priority="999" constant="8" id="8mH-tY-Xpd"/>
                <constraint firstItem="WGv-5C-gVM" firstAttribute="top" secondItem="vUN-kp-3ea" secondAttribute="top" constant="8" id="BMT-uj-nrj"/>
                <constraint firstAttribute="trailing" secondItem="WGv-5C-gVM" secondAttribute="trailing" constant="8" id="Dyv-OC-Mej"/>
                <constraint firstItem="cfP-lM-bLV" firstAttribute="leading" secondItem="vUN-kp-3ea" secondAttribute="leading" constant="8" id="Yoh-Mn-Epa"/>
                <constraint firstItem="cfP-lM-bLV" firstAttribute="top" secondItem="vUN-kp-3ea" secondAttribute="top" constant="8" id="oTg-QC-oRP"/>
            </constraints>
            <freeformSimulatedSizeMetrics key="simulatedDestinationMetrics"/>
            <viewLayoutGuide key="safeArea" id="vUN-kp-3ea"/>
            <point key="canvasLocation" x="138.40000000000001" y="330.13493253373315"/>
        </view>
    </objects>
</document>

DatesView.h

//  DatesView.h
//  Created by Don Mag on 1/30/20.

#import <UIKit/UIKit.h>

NS_ASSUME_NONNULL_BEGIN

@interface DatesView : UIView

@property (strong, nonatomic) IBOutlet UIView *contentView;

@property (strong, nonatomic) IBOutlet UILabel *fromDateLabel;

@property (strong, nonatomic) IBOutlet UILabel *toDateLabel;

@end

NS_ASSUME_NONNULL_END

DatesView.m

//  DatesView.m
//  Created by Don Mag on 1/30/20.

#import "DatesView.h"

@implementation DatesView

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

-(id)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
        [self initializeSubviews];

    }
    return self;
}
-(void)initializeSubviews {
    self.backgroundColor = [UIColor clearColor];

    NSBundle *bundle = [[[NSBundle mainBundle]loadNibNamed:@"DatesView" owner:self options:nil]firstObject];
    [self addSubview:self.contentView];

    self.contentView.frame = self.bounds;

}

@end

TestXIBViewController.h

//  TestXIBViewController.h
//  Created by Don Mag on 1/30/20.

#import <UIKit/UIKit.h>

NS_ASSUME_NONNULL_BEGIN

@interface TestXIBViewController : UIViewController

@end

NS_ASSUME_NONNULL_END

TestXIBViewController.m

//  TestXIBViewController.m
//  Created by Don Mag on 1/30/20.

#import "TestXIBViewController.h"
#import "DatesView.h"

@interface TestXIBViewController ()

@end

@implementation TestXIBViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    DatesView *dv = [DatesView new];
    dv.fromDateLabel.text = @"12";
    dv.toDateLabel.text = @"19";

    [self.view addSubview:dv];

    dv.translatesAutoresizingMaskIntoConstraints = NO;

    UILayoutGuide *g = [self.view safeAreaLayoutGuide];

    // constrain Top, Leading, Trailing at 40-pts
    // NO Bottom or Height constraint
    [NSLayoutConstraint activateConstraints:@[
        [dv.topAnchor constraintEqualToAnchor:g.topAnchor constant: 40.0],
        [dv.leadingAnchor constraintEqualToAnchor:g.leadingAnchor constant: 40.0],
        [dv.trailingAnchor constraintEqualToAnchor:g.trailingAnchor constant: -40.0],
    ]];

}

@end

Result:

score 0 · Answer 2 · answered Jan 30 '20 at 16:30

R-click on the xib "file's Owner" and see if there are any orange warning triangles. delete the references if there are. if you had something referencing an object on the XIB and then delete the object, it will crash until you delete the reference as well.

Custom UIView not loading XIB

2 Answers2