以编程方式保存UITextField数据

Question

我得到了一个UITextField作为子视图。

- (void)viewDidLoad {
    [super viewDidLoad];
textField = [[UITextField alloc] initWithFrame:CGRectMake(21, 21, 159, 37)];
textField.borderStyle = UITextBorderStyleNone;
textField.font = [UIFont systemFontOfSize:15];
textField.placeholder = @"name";
textField.autocorrectionType = UITextAutocorrectionTypeNo;
textField.keyboardType = UIKeyboardTypeDefault;
textField.returnKeyType = UIReturnKeyDone;
textField.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
textField.textColor = [UIColor whiteColor];
textField.keyboardAppearance = UIKeyboardAppearanceDark;
textField.delegate = (id) self;
textField.autocapitalizationType = UITextAutocapitalizationTypeNone;
[textField addTarget:self action:@selector(saveData:) forControlEvents:UIControlEventEditingDidEnd];
[self.view addSubview:textField];
}

---

-(void)saveData:(id)sender {
    NSString *savestring = textField.text; 
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; 
    [defaults setObject:savestring forKey:@"savedstring"]; 
    [defaults synchronize];        
}

加载数据（viewDidLoad）

    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];  
    NSString *loadstring = [defaults objectForKey:@"savedstring"]; 
    [textField setText:loadstring];

现在的问题是它没有保存和加载UITextField的文本。

Answer 1

首先，您需要在Text字段中输入一些字符串并按回车键，这样它就有机会调用您的"saveData"方法并将值存储在NSUserDefaults中。只需检查所有值。

Answer 2

我找到了一个解决方案：

textField.text = [defaults objectForKey:@"savedstring"];

感谢大家的回答

Answer 3

"addSubview"在这个方法之后写入加载数据的方法。。。

[self.view addSubview:textField];
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];  
 NSString *loadstring = [defaults objectForKey:@"savedstring"]; 
 [textField setText:loadstring];