Ios 以编程方式保存UITextField数据

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];

}

要加载数据视图，请单击“加载”

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

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现在的问题是它不会保存和加载UITextField的文本。

首先，您需要在Textfield中输入一些字符串并按return键，这样它就有机会调用saveData方法并将值存储在NSUserDefaults中。只需检查所有值。

我找到了一个解决方案：

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

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感谢大家的回答

在此方法之后添加子视图写入加载数据方法

[self.view addSubview:textField];

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

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您是否将textfield保存为属性？我注意到您正在textfield的UIControlEventEditingDidEnd事件中调用saveData:method，此事件调用是否正确？正如Samir所说，检查该事件是否被调用，如果是，则检查textfield.text是否包含任何字符串值或其null。真的吗？你的问题中已经写了同样的一行。这可不酷，伙计。是的，在初始化textfield之前，您可能正在分配@savedstring的值。

[self.view addSubview:textField];

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