ios - AppDelegate:此类与键的键值编码不兼容---

Question

在AppDelegate.h我创建了以下属性，

@property (strong, nonatomic) NSMutableDictionary *googleUserDetailsDictionary;

在AppDelegate.m ,

static NSString *kGoogleDetails = @"googleDetails";
@synthesize googleUserDetailsDictionary;

我在 AppDelegate.m 中创建了一个自定义方法我在其中添加了以下行: [self setValue:googleUserDetailsDictionary forKey:kGoogleDetails];

在我想成为 googleUserDetailsDictionary 的观察者的 ViewController 中属性(property)，

AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
[appDelegate addObserver:self forKeyPath:@"googleUserDetailsDictionary" options:NSKeyValueObservingOptionOld | NSKeyValueObservingOptionNew context:nil];

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
    if ([keyPath isEqualToString:kGoogleDetails]) {
        NSLog(@"This is change taking place: %@ \t\t", change);

    }
}

然后，当我尝试打开 ViewController 时，出现以下错误: ** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<FIRA_AppDelegate-1470253453284 0x7fd4fa839410> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key googleDetails.'

Answer 1

我相信它告诉你真相。您没有任何名为 googleDetails 的属性。

尝试更改 key 路径以匹配属性，例如:

static NSString *kGoogleDetails = @"googleUserDetailsDictionary";