IOS - NSUnknownKeyException

Question

我正与一个刚开始使用的IOS应用程序做斗争。我一定是按照这封信的指示走的

http://www.appcoda.com/how-to-get-current-location-iphone-user/

然而，在主要的方法中，我得到了以下错误；

2013-12-04 20:28:55.591 MyLocationDemo20391:c07 * Terminating app due to uncaught exception 'NSUnknownKeyException'，reason：‘setValue:forUndefinedKey:：this class is not key value compliant for the key getLocation.’* First throw call stack：(0x1850012 0x116ce7e 0x18d8fb1 0xc18e41 0xb9a5f8 0xb9a0e7 0xbc4b58 0x2ce019 0x1180663 0x184b45a 0x2ccb1c 0x1917e7 0x191dc8 0x191ff8 0x192232 0xe13d5 0xe176f 0xe1905 0xea917 0xae96c 0xaf94b 0xc0cb5 0xc1beb 0xb3698 0x17abdf9 0x17abad0 0x17c5bf5 0x17c5962 0x17f6bb6 0x17f5f44 0x17f5e1b 0xaf17a 0xb0ffc 0x204d 0x1f75) libc++abi.dylib: terminate called throwing an exception

有人大概知道我的代码有什么问题吗？我修改的文件是

//
//  main.m
//  MyLocationDemo
//

#import <UIKit/UIKit.h>

#import "MyLocationAppDelegate.h"
#import "MyLocationViewController.h"
int main(int argc, char *argv[])
{
    @autoreleasepool {
        return UIApplicationMain(argc, argv, nil, NSStringFromClass([MyLocationAppDelegate class]));
    }
}


//
//  MyLocationViewController.h
//  MyLocationDemo
//

#import <UIKit/UIKit.h>
#import <CoreLocation/CoreLocation.h>



@interface MyLocationViewController : UIViewController<CLLocationManagerDelegate>

@property (weak, nonatomic) IBOutlet UILabel *latitudeLabel;
@property (weak, nonatomic) IBOutlet UILabel *longitudeLabel;
@property (weak, nonatomic) IBOutlet UILabel *addressLabel;
- (IBAction)getLocation:(id)sender;

@end

这就是主要的逻辑所在

//
//  MyLocationViewController.m
//  MyLocationDemo
//
//  Created by Ricki Lambert on 04/12/2013.
//  Copyright (c) 2013 Ricki Lambert. All rights reserved.
//

#import "MyLocationViewController.h"



@interface MyLocationViewController ()

@end

@implementation MyLocationViewController

CLLocationManager *locationManager;


- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    locationManager = [[CLLocationManager alloc] init];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (IBAction)getLocation:(id)sender {
    locationManager.delegate = self;
    locationManager.desiredAccuracy = kCLLocationAccuracyBest;

    [locationManager startUpdatingLocation];
}

#pragma mark - CLLocationManagerDelegate

- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
    NSLog(@"didFailWithError: %@", error);
    UIAlertView *errorAlert = [[UIAlertView alloc]
                               initWithTitle:@"Error" message:@"Failed to Get Your Location" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
    [errorAlert show];
}

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
    NSLog(@"didUpdateToLocation: %@", newLocation);
    CLLocation *currentLocation = newLocation;

    if (currentLocation != nil) {
        _longitudeLabel.text = [NSString stringWithFormat:@"%.8f", currentLocation.coordinate.longitude];
        _latitudeLabel.text = [NSString stringWithFormat:@"%.8f", currentLocation.coordinate.latitude];
    }
}
@end

编辑：

添加了以下代码

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="2.0" toolsVersion="3084" systemVersion="12F37" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" initialViewController="2">
    <dependencies>
        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="2083"/>
    </dependencies>
    <scenes>
        <!--My Location View Controller-->
        <scene sceneID="5">
            <objects>
                <viewController id="2" customClass="MyLocationViewController" sceneMemberID="viewController">
                    <view key="view" contentMode="scaleToFill" id="3">
                        <rect key="frame" x="0.0" y="20" width="320" height="548"/>
                        <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                        <subviews>
                            <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" text="Lattitude" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="2NQ-NG-XNs">
                                <constraints>
                                    <constraint firstAttribute="width" constant="114" id="3lT-6l-45k"/>
                                    <constraint firstAttribute="height" constant="34" id="NHO-Yt-dF0"/>
                                </constraints>
                                <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                <color key="textColor" cocoaTouchSystemColor="darkTextColor"/>
                                <nil key="highlightedColor"/>
                            </label>
                            <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" text="Longiude" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="RLl-n5-tOv">
                                <constraints>
                                    <constraint firstAttribute="width" constant="75" id="6AR-qh-Gnd"/>
                                    <constraint firstAttribute="height" constant="27" id="m84-iE-ZY7"/>
                                </constraints>
                                <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                <color key="textColor" cocoaTouchSystemColor="darkTextColor"/>
                                <nil key="highlightedColor"/>
                            </label>
                            <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" text="Address" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="1kJ-EE-aHk">
                                <constraints>
                                    <constraint firstAttribute="height" constant="27" id="6U9-sr-UXJ"/>
                                </constraints>
                                <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                <color key="textColor" cocoaTouchSystemColor="darkTextColor"/>
                                <nil key="highlightedColor"/>
                            </label>
                            <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" text="Lattitude goes here" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="fNS-Dr-1Vu">
                                <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                <color key="textColor" cocoaTouchSystemColor="darkTextColor"/>
                                <nil key="highlightedColor"/>
                            </label>
                            <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" text="Longitude goes here" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="NoA-nn-nJE">
                                <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                <color key="textColor" cocoaTouchSystemColor="darkTextColor"/>
                                <nil key="highlightedColor"/>
                            </label>
                            <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" text="Address goes here" lineBreakMode="tailTruncation" numberOfLines="4" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" preferredMaxLayoutWidth="158" translatesAutoresizingMaskIntoConstraints="NO" id="FRc-NM-7R7">
                                <constraints>
                                    <constraint firstAttribute="height" constant="110" id="Mxn-SQ-dDB"/>
                                    <constraint firstAttribute="width" constant="158" id="giI-DM-8Y6"/>
                                </constraints>
                                <fontDescription key="fontDescription" type="system" pointSize="14"/>
                                <color key="textColor" cocoaTouchSystemColor="darkTextColor"/>
                                <nil key="highlightedColor"/>
                            </label>
                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="tGJ-fU-7T9">
                                <constraints>
                                    <constraint firstAttribute="width" constant="194" id="wCV-5v-wAp"/>
                                </constraints>
                                <fontDescription key="fontDescription" type="boldSystem" pointSize="15"/>
                                <state key="normal" title="Get Address">
                                    <color key="titleColor" red="0.19607843459999999" green="0.30980393290000002" blue="0.52156865600000002" alpha="1" colorSpace="calibratedRGB"/>
                                    <color key="titleShadowColor" white="0.5" alpha="1" colorSpace="calibratedWhite"/>
                                </state>
                                <state key="highlighted">
                                    <color key="titleColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
                                </state>
                                <connections>
                                    <action selector="getLocation:" destination="2" eventType="touchUpInside" id="4Gy-OZ-lTb"/>
                                </connections>
                            </button>
                        </subviews>
                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
                        <constraints>
                            <constraint firstAttribute="trailing" secondItem="FRc-NM-7R7" secondAttribute="trailing" constant="20" symbolic="YES" type="default" id="0Hn-nk-jah"/>
                            <constraint firstItem="FRc-NM-7R7" firstAttribute="top" secondItem="3" secondAttribute="top" constant="177" id="2a9-5q-b4n"/>
                            <constraint firstItem="NoA-nn-nJE" firstAttribute="top" secondItem="RLl-n5-tOv" secondAttribute="top" type="default" id="8xW-ST-2rJ"/>
                            <constraint firstItem="RLl-n5-tOv" firstAttribute="leading" secondItem="2NQ-NG-XNs" secondAttribute="leading" type="default" id="9D0-0e-Dab"/>
                            <constraint firstItem="1kJ-EE-aHk" firstAttribute="top" secondItem="3" secondAttribute="top" constant="174" id="Atx-uI-F5b"/>
                            <constraint firstAttribute="bottom" secondItem="tGJ-fU-7T9" secondAttribute="bottom" constant="131" id="GmZ-gM-2LB"/>
                            <constraint firstItem="1kJ-EE-aHk" firstAttribute="leading" secondItem="RLl-n5-tOv" secondAttribute="leading" type="default" id="Gyh-cL-XiN"/>
                            <constraint firstItem="tGJ-fU-7T9" firstAttribute="centerX" secondItem="3" secondAttribute="centerX" type="default" id="Tb3-0Y-di7"/>
                            <constraint firstItem="FRc-NM-7R7" firstAttribute="leading" secondItem="NoA-nn-nJE" secondAttribute="leading" type="default" id="U11-d2-DSe"/>
                            <constraint firstItem="RLl-n5-tOv" firstAttribute="top" secondItem="3" secondAttribute="top" constant="104" id="VdS-si-Rf1"/>
                            <constraint firstItem="fNS-Dr-1Vu" firstAttribute="top" secondItem="3" secondAttribute="top" constant="43" id="cM5-dt-7bh"/>
                            <constraint firstItem="2NQ-NG-XNs" firstAttribute="top" secondItem="3" secondAttribute="top" constant="37" id="mV7-Ff-Uuy"/>
                            <constraint firstItem="2NQ-NG-XNs" firstAttribute="leading" secondItem="3" secondAttribute="leading" constant="39" id="spa-RY-ZpM"/>
                            <constraint firstItem="1kJ-EE-aHk" firstAttribute="trailing" secondItem="RLl-n5-tOv" secondAttribute="trailing" type="default" id="x03-z0-I5T"/>
                            <constraint firstItem="NoA-nn-nJE" firstAttribute="leading" secondItem="fNS-Dr-1Vu" secondAttribute="leading" type="default" id="x1R-k4-2ns"/>
                        </constraints>
                    </view>
                    <connections>
                        <outlet property="addressLabel" destination="FRc-NM-7R7" id="oNw-qt-0yh"/>
                        <outlet property="getLocation" destination="tGJ-fU-7T9" id="69B-gi-HDF"/>
                        <outlet property="latitudeLabel" destination="fNS-Dr-1Vu" id="hTv-w4-7tN"/>
                        <outlet property="longitudeLabel" destination="NoA-nn-nJE" id="OxD-hl-qRK"/>
                    </connections>
                </viewController>
                <placeholder placeholderIdentifier="IBFirstResponder" id="4" sceneMemberID="firstResponder"/>
            </objects>
        </scene>
    </scenes>
    <classes>
        <class className="MyLocationViewController" superclassName="UIViewController">
            <source key="sourceIdentifier" type="project" relativePath="./Classes/MyLocationViewController.h"/>
            <relationships>
                <relationship kind="action" name="getLocation:"/>
                <relationship kind="outlet" name="addressLabel" candidateClass="UILabel"/>
                <relationship kind="outlet" name="getLocation" candidateClass="UIButton"/>
                <relationship kind="outlet" name="latitudeLabel" candidateClass="UILabel"/>
                <relationship kind="outlet" name="longitudeLabel" candidateClass="UILabel"/>
            </relationships>
        </class>
        <class className="NSLayoutConstraint" superclassName="NSObject">
            <source key="sourceIdentifier" type="project" relativePath="./Classes/NSLayoutConstraint.h"/>
        </class>
    </classes>
    <simulatedMetricsContainer key="defaultSimulatedMetrics">
        <simulatedStatusBarMetrics key="statusBar"/>
        <simulatedOrientationMetrics key="orientation"/>
        <simulatedScreenMetrics key="destination" type="retina4"/>
    </simulatedMetricsContainer>
</document>

Answer 1

<relationship kind="outlet" name="getLocation" candidateClass="UIButton"/>

这将导致您的错误，您将创建一个getLocation插座，它不会指向ViewController中的任何内容。

要解决这个问题：

• 转到Utilies (右窗格)
• 选择连接检查(其箭头为->)
• 删除对getLocation出口的引用

Answer 2

在您的故事板中执行以下操作

1. 选择控制器
2. 显示右面板
3. 单击右边的最后一个连接检查器
4. 如果有人有感叹号，请检查所有连接:然后删除它。

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