有错误的简单应用程序此类对于键“不符合键值编码". [英] simple app with error " this class is not key value coding-compliant for the key "

问题描述

我使用 xib 文件创建了一个简单的 iPhone 应用程序，并在视图中添加了一个按钮.创建一个 IBOutlet 与之连接.每次，我启动它，它会崩溃.完整的错误信息如下:2014-05-03 08:10:19.742 test[1435:a0b] * 由于未捕获的异常而终止应用

'NSUnknownKeyException', reason: '[ setValue:forUndefinedKey:]: 此类不符合键值 txtBtn 的键值编码.'

有很多人问这个问题，在查看答案后，我认为我的问题是不同的.代码如下.

#import @interface XIBViewController : UIViewController{UIButton *txtBtn;}@property (nonatomic, 保留) IBOutlet UIButton *txtBtn;@结尾

创建此视图控制器的来源:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];//在应用程序启动后覆盖自定义点.self.window.backgroundColor = [UIColor whiteColor];[self.window makeKeyAndVisible];UIViewController *controller = [[UIViewController alloc] initWithNibName:@"XIBViewController" bundle:[NSBundle mainBundle]];self.window.rootViewController = 控制器；返回是；}

xib 文件的来源是

<依赖项><plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="3742"/></依赖项><对象><placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner" customClass="XIBViewController"><连接><outlet property="txtBtn" destination="kvg-9r-q01" id="Xtc-tf-xGb"/><outlet property="view" destination="1" id="l1j-Dp-A65"/></连接></占位符><placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/><view contentMode="scaleToFill" id="1"><rect key="frame" x="0.0" y="0.0" width="320" height="568"/><autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/><子视图><button opaque="NO" contentMode="scaleToFill" fixedFrame="YES" contentHorizo​​ntalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="kvg-9r-q01"><rect key="frame" x="103" y="158" width="79" height="30"/><autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/><state key="normal" title="Hello World"><color key="titleShadowColor" white="0.5" alpha="1" colorSpace="calibratedWhite"/></状态></subviews><color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/><simulatedStatusBarMetrics key="simulatedStatusBarMetrics"/><simulatedScreenMetrics key="simulatedDestinationMetrics" type="retina4"/></查看></对象></文档>

解决方案

您已经创建了一个 UIViewController 对象，它没有 txtBtn 属性.>

您需要从这一行更改:

UIViewController *controller = [[UIViewController alloc] initWithNibName:@"XIBViewController" bundle:[NSBundle mainBundle]];

为此:

XIBViewController *controller = [[XIBViewController alloc] initWithNibName:@"XIBViewController" bundle:[NSBundle mainBundle]];

您还需要在 AppDelegate 中#import XIBViewContoller.h.

I create a simple iPhone app with xib file, and add one button to the view. create a IBOutlet to connect with it. each time, I launch it, it will crash. the full error message is as below: 2014-05-03 08:10:19.742 test[1435:a0b] * Terminating app due to uncaught exception

'NSUnknownKeyException', reason: '[ setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key txtBtn.'

There are many people hitting this question, After reviewing the answers, I think my problem is different one. code is as below.

#import <UIKit/UIKit.h>

@interface XIBViewController : UIViewController
{
    UIButton *txtBtn;
}
@property (nonatomic, retain) IBOutlet UIButton *txtBtn;
@end

source of creating this view controller:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];
    UIViewController *controller = [[UIViewController alloc] initWithNibName:@"XIBViewController" bundle:[NSBundle mainBundle]];
    self.window.rootViewController = controller;

    return YES;
}

source of xib file is

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="4510" systemVersion="12F45" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES">
    <dependencies>
        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="3742"/>
    </dependencies>
    <objects>
        <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner" customClass="XIBViewController">
            <connections>
                <outlet property="txtBtn" destination="kvg-9r-q01" id="Xtc-tf-xGb"/>
                <outlet property="view" destination="1" id="l1j-Dp-A65"/>
            </connections>
        </placeholder>
        <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
        <view contentMode="scaleToFill" id="1">
            <rect key="frame" x="0.0" y="0.0" width="320" height="568"/>
            <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
            <subviews>
                <button opaque="NO" contentMode="scaleToFill" fixedFrame="YES" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="kvg-9r-q01">
                    <rect key="frame" x="103" y="158" width="79" height="30"/>
                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                    <state key="normal" title="Hello World">
                        <color key="titleShadowColor" white="0.5" alpha="1" colorSpace="calibratedWhite"/>
                    </state>
                </button>
            </subviews>
            <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
            <simulatedStatusBarMetrics key="simulatedStatusBarMetrics"/>
            <simulatedScreenMetrics key="simulatedDestinationMetrics" type="retina4"/>
        </view>
    </objects>
</document>

解决方案

You've created a UIViewController object, which doesn't have a txtBtn property.

You need to change from this line:

UIViewController *controller = [[UIViewController alloc] initWithNibName:@"XIBViewController" bundle:[NSBundle mainBundle]];

To this:

XIBViewController *controller = [[XIBViewController alloc] initWithNibName:@"XIBViewController" bundle:[NSBundle mainBundle]];

You'll also need to #import XIBViewContoller.h in your AppDelegate.

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