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标题: ios - 在 NSStrings 中自动保存 [打印本页]

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作者: 菜鸟教程小白    时间: 2022-12-11 22:26
标题: ios - 在 NSStrings 中自动保存

我有三个文本字段:名字、姓氏和年龄，还有一张照片。我该怎么做才能让信息自动保存，这样我就不必点击按钮了？

这是我的 ViewController.h:

#import <UIKit/UIKit.h>

@interface ContactViewController : UIViewController <UIImagePickerControllerDelegate, UINavigationControllerDelegate> {

    IBOutlet UIImageView *contactImageView;
    IBOutlet UITextField *firstNameTextField;
    IBOutlet UITextField *lastNameTextField;
    IBOutlet UITextField *ageTextField;
}

- (IBAction)saveid)sender;
- (IBAction)chooseImageid)sender;

@end

这是我的 ViewController.m:

- (void)viewDidLoad {
[super viewDidLoad];

    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

    NSString *frontName = [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];

    firstNameTextField.text = frontName;
    lastNameTextField.text = lastName;
    ageTextField.text = ageString;
    contactImageView.image = contactImage;
}


- (void)viewDidUnload {

    [contactImageView release];
    contactImageView = nil;
    [firstNameTextField release];
    firstNameTextField = nil;
    [lastNameTextField release];
    lastNameTextField = nil;
    [ageTextField release];
    ageTextField = nil;
    [super viewDidUnload];
}

- (BOOL)shouldAutorotateToInterfaceOrientationUIInterfaceOrientation)interfaceOrientation {
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

- (IBAction)saveid)sender  {
    [firstNameTextField resignFirstResponder];
    [lastNameTextField resignFirstResponder];
    [ageTextField resignFirstResponder];

    // Create strings and integer to store the text info
    NSString *frontName = [firstNameTextField text];
    NSString *lastName = [lastNameTextField text];
    int age = [[ageTextField text] integerValue];

    UIImage *contactImage = contactImageView.image;
    NSData *imageData = UIImageJPEGRepresentation(contactImage, 100);


    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

    [defaults setObject:frontName forKey"firstname"];
    [defaults setObject:lastName forKey"lastname"];
    [defaults setInteger:age forKey"age"];
    [defaults setObject:imageData forKey"image"];

    [defaults synchronize];

    NSLog(@"Data saved");
}

- (IBAction)chooseImageid)sender {
    UIImagePickerController *picker = [[[UIImagePickerController alloc] init] autorelease];
    picker.delegate = self;
    picker.allowsEditing = YES;
    picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    [self presentModalViewController:picker animated:YES];
}

- (void)imagePickerControllerUIImagePickerController *)picker didFinishPickingImageUIImage *)image editingInfoNSDictionary *)editingInfo {
   contactImageView.image = image;

    [picker dismissModalViewControllerAnimated:YES];
}


- (void)imagePickerControllerDidCancelUIImagePickerController *)picker {

   [picker dismissModalViewControllerAnimated:YES];

}

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Best Answer-推荐答案

您必须使用 协议(protocol)

引用:UITextFieldDelegate Protocol

你必须设置

textField.delegate = yourViewController

然后可以使用协议(protocol)函数来处理 TextView 的输入和字符更改。

例如你可以使用

- (BOOL)textFieldShouldReturnUITextField *)textField

在用户按下返回按钮时保存文本字段内容 =)

编辑:可能这种方法更适合您的需求 - 我昨天写帖子时有点累=)

- (void)textFieldDidEndEditing:(UITextField *)textField {
    //save your textfied.text string here 
}

关于ios - 在 NSStrings 中自动保存，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/10032088/

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