objective-c - Xcode 无法识别自定义类方法

Question

我编写了以下自定义类:

AKRelativeDates.h

#import <Foundation/Foundation.h>
#import "NSDate-Utilities.h"

@interface AKRelativeDates

- (NSString *)relativeDateFromDate:(NSDate *)date in24hFormat:(BOOL)in24hFormat capitalized:(BOOL)capitalized;

@end

AKRelativeDates.m

#import "AKRelativeDates.h"

@implementation AKRelativeDates

- (NSString *)relativeDateFromDate:(NSDate *)date in24hFormat:(BOOL)in24hFormat capitalized:(BOOL)capitalized
{
    // method implementation removed
    return @"test";
}

@end

我导入了头文件，类被识别，但方法不能。我做错了什么吗？

Answer 1

您的 header 中遗漏了一些内容:

#import <Foundation/Foundation.h>
#import "NSDate-Utilities.h"

@interface AKRelativeDates : NSObject    //Follow the class name with the superclass.

{
    //Now enclose any class objects if any - if none then brackets are optional
}

//And now time for the method declarations:

- (NSString *)relativeDateFromDate:(NSDate *)date in24hFormat:(BOOL)in24hFormat capitalized:(BOOL)capitalized;

@end

此外，如果它是一个类方法(即您不想在使用此方法之前创建对象)，则将“-”替换为“+”