- [NSDictionary的initWithObjects：forKeys：]：對象的計數（0）鍵的計數不同（2）

Question

我得到的

錯誤 - [NSDictionary的initWithObjects：forKeys：]：對象的計數（0 ）不同於計數鍵（2）'

這裏是我的代碼保存plist。

@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幾乎肯定nil這裏，過早結束了數組列表。

如果您在此處使用了新的數組文本語法：

@[morningtime1, afternoontime1]; 

，你會得到一個崩潰，因爲它是非法的分配零到NSArray元素。

Answer 2

這條線：

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

應該是：

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

換句話說，參考屬性，而不是實例變量。如你所知，伊法爾從未設置過（您設置的是實際設置生成的伊瓦爾的屬性，名稱爲_morningtime1）。

旁註：

擺脫任何明確的實例變量和@synthesize線的屬性。這將避免這種混淆。