NSUserDefaults数据存取

最新推荐文章于 2023-05-16 21:17:49 发布

kirakingdx

最新推荐文章于 2023-05-16 21:17:49 发布

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分类专栏：数据处理文章标签： NSUserDefaults

本文链接：https://blog.youkuaiyun.com/kirakingdx/article/details/84280614

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本文介绍了一个简单的iOS应用程序如何实现用户数据的存储与加载功能。通过使用NSUserDefaults类来保存和读取用户的输入信息，包括姓名、年龄及联系人图片等，并在视图加载时恢复这些数据。

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 //保存数据
 - (IBAction)save:(id)sender
{
    // Hide the keyboard
    [firstNameTextField resignFirstResponder];
    [lastNameTextField resignFirstResponder];
    [ageTextField resignFirstResponder];
 
    // Create strings and integer to store the text info
    NSString *firstName = [firstNameTextField text];
    NSString *lastName  = [lastNameTextField text];
    int age = [[ageTextField text] integerValue];
 
    // Create instances of NSData
    UIImage *contactImage = contactImageView.image;
    NSData *imageData = UIImageJPEGRepresentation(contactImage, 100);
 
    // Store the data
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
 
    [defaults setObject:firstName forKey:@"firstName"];
    [defaults setObject:lastName forKey:@"lastname"];
    [defaults setInteger:age forKey:@"age"];
    [defaults setObject:imageData forKey:@"image"];
 
    [defaults synchronize];
 
    NSLog(@"Data saved");
}


//读取数据
 - (void)viewDidLoad
{
    // Get the stored data before the view loads
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
 
    NSString *firstName = [defaults objectForKey:@"firstName"];
    NSString *lastName = [defaults objectForKey:@"lastname"];
 
    int age = [defaults integerForKey:@"age"];
    NSString *ageString = [NSString stringWithFormat:@"%i",age];
 
    NSData *imageData = [defaults dataForKey:@"image"];
    UIImage *contactImage = [UIImage imageWithData:imageData];
 
    // Update the UI elements with the saved data
    firstNameTextField.text = firstName;
    lastNameTextField.text = lastName;
    ageTextField.text = ageString;
    contactImageView.image = contactImage;
 
    [super viewDidLoad];
}