当我在目标 c 中进行方法调用时，NSLog 不起作用

Question

我正在开发我的第一个 iOS 应用。我确定我在这里做错了什么，但我似乎无法找出问题所在。

我有一个包含一些 IBActions 的应用程序，它做两件事：

1) 通过 NSLog 输出一些简单的文本（让我知道操作有效） - 这可以正常工作（它通过 NSLog 输出我的文本）

2) 调用自定义类中的方法，该方法也应输出 NSLog 语句。 - 这不起作用（没有通过 NSLog 输出文本）

我还在为在哪里创建我的类的实例以便在我的代码中的其他地方可以访问它们而苦苦挣扎。

代码如下：

//
//  ViewController.h
//  OrcAndPie
//
//  Created by me on 4/27/13.
//  Copyright (c) 2013 me. All rights reserved.
//

#import <UIKit/UIKit.h>
#import "Player.h"
#import "Orc.h"

@interface ViewController : UIViewController {
    // Variables that you want to access globally go here?
    Player *wizard;
    Orc *grunty;

}

-(IBAction)takePie:(id)sender;
-(IBAction)castFireball:(id)sender;
-(IBAction)attack:(id)sender;



@end

和

//
//  ViewController.m
//  OrcAndPie
//
//  Created by me on 4/27/13.
//  Copyright (c) 2013 me. All rights reserved.
//

#import "ViewController.h"
#import "Player.h"

@interface ViewController ()

@end

@implementation ViewController

-(IBAction)takePie:(id)sender{
    // Player attempts to take the pie
    // If Orc's health is > 0, don't let the player take the pie
    // If the Orc's health is <= zero, let the player take the pie
    NSLog(@"IBAction - player attempted to take the pie.");
    [wizard takePie];

}

-(IBAction)castFireball:(id)sender{
    NSLog(@"IBAction - player cast fireball.");
    [wizard castFireball];
}
-(IBAction)attack:(id)sender{
    NSLog(@"IBAction - player attacked.");
    [wizard attackOrc];

}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    Player *wizard = [[Player alloc]init];
    Orc *grunty = [[Orc alloc]init];

}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

和

//
//  Player.h
//  OrcAndPie
//
//  Created by me on 4/27/13.
//  Copyright (c) 2013 me. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface Player : NSObject

@property int maxHealth;
@property int currentHealth;
@property int armorClass;
@property int meleeToHitModifier;


-(void)setHeathBar;
-(void)attackOrc;
-(void)castFireball;
-(void)takePie;


@end

和

//
//  Player.m
//  OrcAndPie
//
//  Created by me on 4/27/13.
//  Copyright (c) 2013 me. All rights reserved.
//

#import "Player.h"

@implementation Player

@synthesize maxHealth;
@synthesize currentHealth;
@synthesize armorClass;
@synthesize meleeToHitModifier;

-(void)setHealthBar {
    NSLog(@"Player health is 15");
    return;

}

-(void)attackOrc {
    // roll a d20
    // add the "to hit" modifier
    // compare the result to the orc's armor class
    NSLog(@"Player - Player attached the Orc");
    return;

}
-(void)castFireball{
    NSLog(@"Player - Player casts Fireball");
    return;

}
-(void)takePie{
    NSLog(@"Player - Player attempts to take pie");
    return;

}

@end

注意：我还定义了一个 Orc 类，但它看起来与显示的播放器类完全相同。

提前感谢您的帮助！

-- 艾迪

Answer 1

您的 ViewController.h（您应该使用更独特的名称来称呼它，仅供参考）应该如下所示：

//
//  ViewController.h
//  OrcAndPie
//
//  Created by me on 4/27/13.
//  Copyright (c) 2013 me. All rights reserved.
//

#import <UIKit/UIKit.h>
#import "Player.h"
#import "Orc.h"

@interface ViewController : UIViewController

@property Player *wizard;
@property Orc *grunty;

-(IBAction)takePie:(id)sender;
-(IBAction)castFireball:(id)sender;
-(IBAction)attack:(id)sender;

@end

然后在您的 ViewController.m 中，您的 viewDidLoadMethod 应该如下所示：

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    self.wizard = [[Player alloc]init];
    self.grunty = [[Orc alloc]init];

}

这至少应该确保您有一个可以调用方法的 Player 实例化实例，因此应该可以访问您的 NSLog。