不可見@interface對於'鳥ighting'聲明選擇器'initwithname：location：date：'

Question

我是新來的ios編程和卡在我的第二個教程，它調用了你的第二個iOS應用程序，關於在apple.apple.com 。在'運行代碼時'顯示詳細信息場景中的信息'部分的結尾處，我得到「不可見的@ birdfaceing接口」在BirdSightingDataController.m文件中聲明瞭選擇器'initwithname：location：date：'「錯誤「目擊= [[BirdSighting alloc] initWithName：@」Pigeon「位置：@」Everywhere「date：today];」線。我檢查了很多次這個文件，並再次做了這個測試，但是我不知道該如何糾正這個問題？

#import "BirdSightingDataController.h" 
#import "BirdSighting.h" 
@interface BirdSightingDataController() 
- (void)initializeDefaultDataList; 
@end 
@implementation BirdSightingDataController 
- (void)initializeDefaultDataList { 
    NSMutableArray *sightingList = [[NSMutableArray alloc] init]; 
    self.masterBirdSightingList = sightingList; 
    BirdSighting *sighting; 
    NSDate *today = [NSDate date]; 
    sighting = [[BirdSighting alloc] initWithName:@"Pigeon" location:@"Everywhere" date:today]; 
    [self addBirdSightingWithSighting:sighting]; 
} 
- (void)setMasterBirdSightingList:(NSMutableArray *)newList { 
    if (_masterBirdSightingList != newList) { 
     _masterBirdSightingList = [newList mutableCopy]; 
    } 
} 
- (id)init { 
    if (self = [super init]) { 
     [self initializeDefaultDataList]; 
     return self; 
    } 
    return nil; 
} 
- (NSUInteger)countOfList { 
    return [self.masterBirdSightingList count]; 
} 
- (BirdSighting *)objectInListAtIndex:(NSUInteger)theIndex { 
    return [self.masterBirdSightingList objectAtIndex:theIndex]; 
} 
- (void)addBirdSightingWithSighting:(BirdSighting *)sighting { 
    [self.masterBirdSightingList addObject:sighting]; 
} 
@end 

Birdsighting.h文件

#import <Foundation/Foundation.h> 

@interface BirdSighting : NSObject 

@property (nonatomic, copy) NSString *name; 
@property (nonatomic, copy) NSString *location; 
@property (nonatomic, strong) NSDate *date; 
-(id)initWithName:(NSString *) name locaiton:(NSString *)location date:(NSDate *) date; 

@end 

Answer 1

檢查Birdsighting.h並確保該方法

- (id)initWithName:(NSString *)name location:(NSString *)location date:(NSDate *)date; 

聲明那裏。這基本上告訴其他類什麼方法可用於Bidsighting類的實例。

其可能存在接口聲明中的拼寫錯誤（即使在蘋果示例中也會發生這種錯誤）。