Question

我是Obj-C和iOS开发的新手，并且已经设置了故事板和基本控制器。

我现在正试图在字典中对用户输入进行一些基本存储，但我并不是100％确定如何设置字典。我已经浏览了文档，但有点卡住了。

基本上，我想实现：

创建字典
从＆＃34; titleTextField＆＃34;访问输入值并将其设置为键title
然后，我只想使用字典中的密钥访问该值，并使用NSLog进行确认。

我已粘贴在代码中，请参阅底部的功能，但如果我对所有属性的语法正确，我不能100％确定。您可以看到页面顶部定义的@property，然后我尝试访问底部addButtonTapped函数中的那些。

非常感谢任何帮助或指导！

//  AddViewController.m
//  TodoApp
//

#import "AddViewController.h"

@interface AddViewController ()
@property (strong, nonatomic) IBOutlet UITextView *notesTextView;
@property (strong, nonatomic) IBOutlet UITextField *titleTextField;
- (IBAction)addButtonTapped:(UIBarButtonItem *)sender;

@end

@implementation AddViewController

- (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.
}

- (IBAction)addButtonTapped:(UIBarButtonItem *)sender {
    NSLog(@"Add button tapped");

    //Create dictionary and store the values from the text fields and views

    NSMutableDictionary *items = [NSMutableDictionary dictionaryWithObjectsAndKeys:_titleTextField,@"title", nil];
    [items setObject:_titleTextField forKey:@"title"];




}
@end

Answer 1

你走在正确的轨道上。这是你正在寻找的东西：

- (IBAction)addButtonTapped:(UIBarButtonItem *)sender {
    NSLog(@"Add button tapped");

    // Create dictionary and store the values from the text fields and views
    // This is a class method, which you can tell because it is called
    // with NSMutableDictionary as its receiver.
    NSMutableDictionary *dict = [NSMutableDictionary dictionary];

    // This is the modern way to set dictionary values. You could also
    // use [dict setObject:self.titleTextField.text forKey:@"title] , 
    // but that's outdated and less clear.
    dict[@"title"] = self.titleTextField.text;

    // Log out the value to confirm
    NSLog(@"title : %@", dict[@"title"]);
}

根据我在您的代码中看到的误解，我建议阅读：

在Obj C中创建字典并存储值

1 个答案: