Question

我正在尝试为我的程序制作自定义HashTable。是的，我知道Xcode中已经有一个HashTable类，但是对于这种情况我有一个自定义类。它应该很简单，但是当我尝试在我的视图控制器中使用它时，即使在调用初始化方法之后，调试器也将其值显示为“0x0”。这是代码：

//header file HashTable.h

#import <Foundation/Foundation.h>


@interface HashTable : NSObject 
{   
}

-(void)initWithLength:(int)capacity;
-(void)add:(NSObject*)object withName:(NSString*)name;
-(id)getObjectFromIndex:(int)index;
-(id)getObjectWithName:(NSString*)name;

@end


//main file HashTable.m

#import "HashTable.h"

@implementation HashTable

NSMutableArray* values;
NSMutableArray* markers;

-(id)initWithLength:(int)capacity  //Apparently, this never gets called
{
    self = [super init];
    if (self) 
    {
        values = [[NSMutableArray alloc] initWithCapacity:capacity];
        markers = [[NSMutableArray alloc] initWithCapacity:capacity];
    }
    return self;
}

-(void)add:(NSObject*)object withName:(NSString*)name
{
    [values addObject:object];
    [markers addObject:name];
}

-(id)getObjectFromIndex:(int)index
{
    return [values objectAtIndex:index];
}

-(id)getObjectWithName:(NSString*)name
{
    for (int i = 0; i < [markers count]; i++) 
    {
        if ([[markers objectAtIndex:i] isEqualToString:name]) {return [values objectAtIndex:i];}
    }
    return [NSObject new];
}

-(void)removeObjectFromIndex:(int)index
{
    [values removeObjectAtIndex:index];
    [markers removeObjectAtIndex:index];
}

-(void)removeObjectWithName:(NSString*)name
{
    for (int i = 0; i < [markers count]; i++) 
    {
        if ([[markers objectAtIndex:i] isEqualToString:name]) 
        {
            [values removeObjectAtIndex:i];
            [markers removeObjectAtIndex:i];
            return;
        }
    }
}

-(BOOL)isEmpty
{
    return [values count] == 0;
}

-(void)dealloc
{
    [values release];
    [markers release];
    [super dealloc];
}

@end

然后我有视图控制器的段使用HashTable：

//header file

#import <UIKit/UIKit.h>

#import "HashTable.h"

@interface Circuitry_LabViewController : UIViewController 
{
    HashTable* table;
}

@property(nonatomic, retain) HashTable* table;

@end

//main file

#import "Circuitry_LabViewController.h"

@implementation Circuitry_LabViewController

@synthesize table;

- (void)viewDidLoad 
{
    [table initWithLength:10];
    [super viewDidLoad];
}

我看不到我在这里失踪的东西。有人可以帮忙吗？

Answer 1

您打算在-viewDidLoad:

中执行此操作

table = [[HashTable alloc] initWithLength:10];

_{有人告诉我你做错了。}

初始化自定义类的对象时出现问题

1 个答案: