iphone - 我的类(class)实现不完整？

Question

//
//  Possession.m
//  RandomPossessions
//
//  Created by Paxton Harman on 1/14/11.
//  Copyright 2011 Santa Barbara City College. All rights reserved.
//

#import "Possession.h"


@implementation Possession
@synthesize possessionName, serialNumber, valueInDollars, dateCreated;
@end

- (id)initWithPossessionName:(NSString *)name;


valueindollars:(int)value
serialNumber:(NSString *)sNumber
{
    // Call the superclass's designated initializer 
        self = [super init];
    // Did the superclass's designated initializer fail?
     if (!self)
         return nil;

    // Give the instance variables initial values
    [self setPossessionsName:name];
    [self setSerialNumber:sNumber];
    [self setValueInDollars:value];
    dateCreated = [[NSDate alloc] init];

    // Return the address of the newly initialized object
    return self;

}
- (id)initWithPossessionName:(NSString *)name
{
    return [self initWithossessionName:name
                        valueInDollars:0
                         serialnNumber:@""];
}
@end

- (NSString *)description {

    NSString *descriptionString =
        [[NSString alloc] initWithFormat:@"%@ (%@): Worth $%d, Recorded on %@",
                        possessionName,
                        serialNumber,
                        valueInDollars,
                        dateCreated];
    return descriptionString;
}

- (id)init {
    return [self initWithPossessionName:@"Possession"
                         valueInDollars:0
                           serialNumber:@""];
}

+(id)randomPossesion {

// Create two arrays with a list of possible adjectives and nouns
// Note: When using NSArray's arrayWithObjects;, you can pass as many
// objects as you like. At the end of that list, you put nil to
// signify that there are no more objects - otherwise you will crash.
// The nil value is not added to the array, but it used by the method
// to determine the end of the list.
    NSArray *randomAdjectiveList = [NSArray array WithObjects:@"Fluffy",
@"Rusty",
                                    @"Shiny", nil];
    NSArray *randomNounList = [NSArray arrayWithObjects:@"Bear",
@"Spork",
                               @"Mac", nil];

// Get the index of random adjective/noun from the lists
// Note: The % operator, called the modulo operator, gives
// you the remainder. So adjectiveIndex is a random number
// from 0 to 2 inclusive, in this case.
    int adjectiveIndex = random() % [randomAdjectiveList count];
    int nounIndex = random() % [randomNounList count];

    NSString *randomName = [NSString stringWithFormat:@"%@ %@",
                            [randomAdjectiveList objectAtIndex:adjectiveIndex],
                            [randomNounList objectAtIndex:nounIndex]];

    int randomValue = random() % 100;

    NSString *randomSerialNumber = [NSString stringWithFormat:@"%c%c%c%c%c",
'0' + random() % 10,
'A' + random() % 26,
'0' + random() % 10,
'A' + random() % 26,
                                    '0' + random() % 10];

// Once again, ignore the memory problems with this method
// We use "self" instead of the name of the class in class methods...
// Keep reading to find out why
Possession *newPossesion = 
    [[self alloc] initWithPossessionName:randomName
                          valueInDollars:randomValue
                            serialNumber:randomSerialNumber];
    return newPossession;
}

在第 14 行和第 19 行，它给了我“不完整的占有实现”和预期的“{”在“valueindollars”之前，恭敬地。有什么帮助吗？ cocoa 新手

Answer 1

您有两个@end指令。两者都不在正确的位置。令人惊讶的是，它们应该位于实现 block 的末尾。

在此方法签名中，删除分号(最好是空行):

- (id)initWithPossessionName:(NSString *)name;

valueindollars:(int)value
serialNumber:(NSString *)sNumber

这个错误让 Jacob Relkin 和 Adam Eberbach 感到困惑，导致他们尝试修复实际上不存在的东西。

在便利初始化器 - (id)initWithPossessionName:(NSString *)name 和 -init 中，您正在调用一个不存在的方法 - 有您调用的选择器中存在一些拼写错误，如果没有额外的分号，您实际定义的选择器中也会出现一些大写问题。