ios - -[NSDictionary initWithObjects :forKeys:]: count of objects (0) differs from count of keys (2)

Question

我得到的错误是

-[NSDictionary initWithObjects:forKeys:]: 对象数 (0) 不同于键数 (2)'

这是我保存 plist 的代码。

    @interface setting : UIViewController{
    UIDatePicker *datePicker;
    IBOutlet UILabel * morningtime;
    UIDatePicker *afternoonpicker;
    NSString*morningtime1;
    NSString*afternoontime1;
     IBOutlet UILabel *afternoontime;
}
@property (nonatomic,retain) IBOutlet UIDatePicker *datePicker;
@property (strong, nonatomic) IBOutlet UIDatePicker *afternoonpicker;

@property (nonatomic, retain) IBOutlet NSString *morningtime1;

@property (nonatomic, retain) IBOutlet NSString *afternoontime1;
@property (nonatomic, retain) IBOutlet UILabel *morningtime;

@property (nonatomic, retain) IBOutlet UILabel *afternoontime;
@property (weak, nonatomic) IBOutlet UIButton *morning;




- (IBAction)savetext:(id)sender {
    NSArray *paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES);
    // get documents path
    NSString *documentsPath = [paths objectAtIndex:0];
    // get the path to our Data/plist file
    NSString *plistPath = [documentsPath stringByAppendingPathComponent:@"Data.plist"];

    self.morningtime1 = morningtime.text;
    self.afternoontime1 = afternoontime.text;
    NSDictionary *plistDict = [NSDictionary dictionaryWithObjects: [NSArray arrayWithObjects: morningtime1, afternoontime1, nil] forKeys:[NSArray arrayWithObjects: @"Morning", @"Afternoon", nil]];

    NSString *error = nil;
    // create NSData from dictionary
    NSData *plistData = [NSPropertyListSerialization dataFromPropertyList:plistDict format:NSPropertyListXMLFormat_v1_0 errorDescription:&error];

    // check is plistData exists
    if(plistData)
    {
        // write plistData to our Data.plist file
        [plistData writeToFile:plistPath atomically:YES];
    }
    else
    {
        NSLog(@"Error in saveData: %@", error);
    }
}

Answer 1

morningtime1 几乎肯定是 nil，提前结束数组列表。

如果你在这里使用了新的数组文字语法:

@[morningtime1, afternoontime1];

您会遇到崩溃，因为将 nil 分配给 NSArray 元素是非法的。