此类不是密钥XXX的密钥值编码兼容 [英] this class is not key value coding-compliant for the key XXX

问题描述

我是所有编程的初学者，并且一直试图从Big Nerd Ranch Books中实现一些自学的东西。但我真的被这个问题困扰了，是的，我已经在这个和其他论坛上搜索了可能的解决方案而没有成功。以下是代码：

I'm a beginner in everything programming and have been trying to implement some self learned stuff from the Big Nerd Ranch Books. But I'm really stumped by this problem, and yes, I have searched this and other forums for possible solutions with no success. Here is the code:

ANKYViewController.h：

ANKYViewController.h:

#import <UIKit/UIKit.h>

@interface ANKYViewController : UIViewController
@property (weak, nonatomic) IBOutlet UITextField *weightFieldDeadlift;
@property (weak, nonatomic) IBOutlet UITextField *repFieldDeadlift;
@property (strong, nonatomic) IBOutlet UILabel *workingOneRMDeadlift;

@property (weak, nonatomic) IBOutlet UITextField *weightFieldBenchPress;
@property (weak, nonatomic) IBOutlet UITextField *repFieldBenchPress;
@property (strong, nonatomic) IBOutlet UILabel *workingOneRMBenchPress;

@property (weak, nonatomic) IBOutlet UITextField *weightFieldSquat;
@property (weak, nonatomic) IBOutlet UITextField *repFieldSquat;
@property (strong, nonatomic) IBOutlet UILabel *workingOneRMSquat;

@property (weak, nonatomic) IBOutlet UITextField *weightFieldMilitaryPress;
@property (weak, nonatomic) IBOutlet UITextField *repFieldMilitaryPress;
@property (strong, nonatomic) IBOutlet UILabel *workingOneRMMilitaryPress;

- (IBAction)calculateOneRM:(id)sender;

@end

ANKYViewController.m：

ANKYViewController.m:

#import "ANKYViewController.h"

@interface ANKYViewController ()

@end

@implementation ANKYViewController
@synthesize weightFieldDeadlift;
@synthesize repFieldBenchPress;
@synthesize workingOneRMBenchPress;
@synthesize weightFieldSquat;
@synthesize repFieldSquat;
@synthesize workingOneRMSquat;
@synthesize weightFieldMilitaryPress;
@synthesize repFieldMilitaryPress;
@synthesize workingOneRMMilitaryPress;
@synthesize repFieldDeadlift;
@synthesize workingOneRMDeadlift;
@synthesize weightFieldBenchPress;

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

- (void)viewDidUnload
{
    [self setWeightFieldDeadlift:nil];
    [self setRepFieldDeadlift:nil];
    [self setWorkingOneRMDeadlift:nil];
    [self setWeightFieldDeadlift:nil];
    [self setRepFieldBenchPress:nil];
    [self setWeightFieldBenchPress:nil];
    [self setWorkingOneRMBenchPress:nil];
    [self setWeightFieldSquat:nil];
    [self setRepFieldSquat:nil];
    [self setWorkingOneRMSquat:nil];
    [self setWeightFieldMilitaryPress:nil];
    [self setRepFieldMilitaryPress:nil];
    [self setWorkingOneRMMilitaryPress:nil];
    [super viewDidUnload];
    // Release any retained subviews of the main view.
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}

- (IBAction)calculateOneRM:(id)sender {
    float dw = [[weightFieldDeadlift text]floatValue];
    float dr = [[repFieldDeadlift text]floatValue];
    float d = (dw * dr * 0.0333) + dw;
    NSLog(@"Deadlift: %f", d);
    NSString *deadlift = [[NSString alloc]initWithFormat:@"%f", d];
    [workingOneRMDeadlift setText:deadlift];

    float bpw = [[weightFieldBenchPress text]floatValue];
    float bpr = [[repFieldBenchPress text]floatValue];
    float bp = (bpw * bpr * 0.0333) + bpw;
    NSLog(@"Bench Press: %f", bp);
    NSString *benchPress = [[NSString alloc]initWithFormat:@"%f", bp];
    [workingOneRMBenchPress setText:benchPress];

    float sw = [[weightFieldSquat text]floatValue];
    float sr = [[repFieldSquat text]floatValue];
    float s = (sw * sr * 0.0333) + sw;
    NSLog(@"Squat: %f", s);
    NSString *squat = [[NSString alloc]initWithFormat:@"%f", s];
    [workingOneRMSquat setText:squat];

    float mpw = [[weightFieldMilitaryPress text]floatValue];
    float mpr = [[repFieldMilitaryPress text]floatValue];
    float mp = (mpw * mpr * 0.0333) + mpw;
    NSLog(@"Military Press: %f", mp);
    NSString *militaryPress = [[NSString alloc]initWithFormat:@"%f", mp];
    [workingOneRMMilitaryPress setText:militaryPress];
}
@end

文件的所有者类已经声明为ANKYViewController。链接出口等是通过控制拖动而不是手动编码（我花了太多时间后放弃了）。

File's owner class is already stated as ANKYViewController. Linking the outlets etc was by control dragging instead of manually coding (I gave up after spending too many hours).

错误：

*** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<UIApplication 0x6c22e70> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key repsField.'

没有代码的复制和粘贴，并且在任何地方都没有提到repsField（而不是repFieldxxx）当然令人痛苦。

There's no copy and pasting of code, and it's certainly distressing that there is no mentioning of "repsField"(instead of repFieldxxx) anywhere.

我希望这是足够的信息为了帮助找到解决方案，因为我花了几天时间查看其他人的解决方案但没有成功。

I hope that this is enough information to help lead to a solution, as I've spent days looking through other people's solutions with no success.

谢谢。

推荐答案

看起来问题是有人正在使用密钥访问 UIApplication 实例（ repsField ）不符合KVC。

Looks like the problem is that someone is accessing the UIApplication instance with a key (repsField) that is not KVC compliant.

更新我认为您甚至不需要子类添加断点。转到断点导航器并为符号 - [UIApplication setValue：forUndefinedKey：] 添加符号断点，然后运行应用程序。

Update I don't think you even need to subclass to add a breakpoint. Go to the breakpoint navigator and add a symbolic breakpoint for symbol -[UIApplication setValue:forUndefinedKey:] and then run the application.

我认为您可以通过继承 UIApplication 来调试它，并在 setValue：forUndefinedKey：方法。

I think you can debug it by subclassing UIApplication and set a breakpoint in a dummy override of the setValue:forUndefinedKey: method.

在您调用 UIApplicationMain 的文件中添加此类：

In the file where you call UIApplicationMain add this class:

@interface TestApplication : UIApplication
@end
@implementation TestApplication
- (void)setValue:(id)value forUndefinedKey:(NSString *)key {
    [super setValue:value forUndefinedKey:key]; // set breakpoint here
}
@end

然后改变第三个参数 UIApplicationMain 到 @TestApplication，例如：

And then change the third argument to UIApplicationMain to @"TestApplication", for example:

UIApplicationMain(argc, argv, @"TestApplication", NSStringFromClass([AppDelegate class]));

现在运行应用程序，它应该进入调试器，你应该能够看到调用堆栈导致它。

Now run the application and it should break into to debugger and you should be able to see the call stack causing it.

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