当我们使用故事板时，我们如何在objective-c中实现自定义init方法

Question

我在XCode 4.6.3中使用情节提要创建了一些按钮和标签我想在单击FirstViewController中的按钮时激发一些方法，为了使这些方法发挥作用，我定义了一些变量/NSMutableArrays（currentQuestionIndex、questions等）。我想使用自定义的init方法来初始化这些方法。当我保持initWithNibName和initWithCoder的原样，编写一个新的init方法并在其中编写实现时，它不会被调用。

但是，当我按照下面的片段所示操作代码时，它起了作用。

我想知道在使用Storyboard创建对象时如何使用自定义init方法，因为我在这里所做的可能不是一个好的实践。当我尝试使用initWithCoder进行初始化时，它不起作用。但据我所知，我们使用initWithCoder从Storyboard初始化，对吧？storyboard中的按钮/标签位于FirstViewController中。

这是我的FirstViewController.h文件

#import <UIKit/UIKit.h>
@interface FirstViewController : UIViewController
{
    int currentQuestionIndex;
    // The model objects
    NSMutableArray *questions;
    NSMutableArray *answers;
    //The view objects
    IBOutlet UILabel *questionField;
    IBOutlet UILabel *answerField;
}
@property (strong, nonatomic) UIWindow *window;
- (IBAction)showQuestion:(id)sender;
- (IBAction)showAnswer:(id)sender;
@end

和

这是我的FirstViewController.m文件

#import "FirstViewController.h"
@interface FirstViewController ()
@end
@implementation FirstViewController
- (id)init {
    // Call the init method implemented by the superclass
    self = [super init];
    if(self) {
        currentQuestionIndex = -1;
        // Create two arrays and make the pointers point to them
        questions = [[NSMutableArray alloc] init];
        answers = [[NSMutableArray alloc] init];
        // Add questions and answers to the arrays
        [questions addObject:@"What is 7 + 7?"];
        [answers addObject:@"14"];
        [questions addObject:@"What is the capital of Vermont?"];
        [answers addObject:@"Montpelier"];
        [questions addObject:@"From what is cognac made?"];
        [answers addObject:@"Grapes"];
    }
    // Return the address of the new object
    return self;
}
-(IBAction)showQuestion:(id)sender
{
    currentQuestionIndex++;
    if(currentQuestionIndex == [questions count])
        currentQuestionIndex = 0;
    NSLog(@"%d",[questions count]);
    NSString *question = [questions objectAtIndex:currentQuestionIndex];
    NSLog(@"dislaying question at index %d : %@" ,currentQuestionIndex,question);
    [questionField setText:question];
    [answerField setText:@"???"];
}
-(IBAction)showAnswer:(id)sender
{
    NSString *answer = [answers objectAtIndex:currentQuestionIndex];
    [answerField setText:answer];
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}
- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
}
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
@end

Answer 1

我正在获取所有值。。当我登录时。。。试试这个

-(id)initWithCoder:(NSCoder *)aDecoder{
    if(self = [super initWithCoder:aDecoder]) {
        currentQuestionIndex = 15;
        NSLog(@"%d", currentQuestionIndex);
        // Create two arrays and make the pointers point to them
        questions = [[NSMutableArray alloc] init];
        answers = [[NSMutableArray alloc] init];
        // Add questions and answers to the arrays
        [questions addObject:@"What is 7 + 7?"];
        [answers addObject:@"14"];
        [questions addObject:@"What is the capital of Vermont?"];
        [answers addObject:@"Montpelier"];
        [questions addObject:@"From what is cognac made?"];
        [answers addObject:@"Grapes"];
        NSLog(@"Questions = %@", questions);
        NSLog(@"Answers = %@", answers);
     }
     return self;
}

Answer 2

您可以在UIViewController 中使用- (void)awakeFromNib方法