以编程方式将来自 UITextFields 的值存储在 NSArray iOS

Question

首先我想说我对 iOS 编程还很陌生，所以请原谅我的无知。

我的 CustomLayout 中有三个 UITextField。我要求用户填写他们的姓名、年龄和性别。如果可能的话，我想要两件事。首先，我想，一旦用户从键盘点击返回按钮，输入字符串就会存储在 NSArray 中。此外，次要目标是在用户点击同一个按钮时遍历 UITextFields。

// CustomLayout.h
@interface CustomLayout : UIView {

UITextField *nameField;
UITextField *ageField;
UITextField *sexField;

UILabel *nameLabel;
UILabel *ageLabel;
UILabel *sexLabel;

UIButton *startButton;

}

@property (nonatomic, strong) UITextField *nameField;
@property (nonatomic, strong) UITextField *ageField;
@property (nonatomic, strong) UITextField *sexField;

@property (nonatomic, strong) UILabel *nameLabel;
@property (nonatomic, strong) UILabel *ageLabel;
@property (nonatomic, strong) UILabel *sexLabel;

@property (nonatomic, strong) UIButton *startButton;

-(void)textFieldShouldReturn:(UITextField*)textField;

@end

在实现文件中

//CustomLayout.m
@implementation CustomLayout

@synthesize nameField, ageField, sexField;
@synthesize nameLabel, ageLabel, sexLabel;
@synthesize startButton;

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        [self setBackgroundColor:[tkStyle viewBackgroundColor]];

        NSString *startButtonLabel = @"Start Experiment";

        //alocate and position views
        CGRect viewRect;//placeholder rect, reused for each view

        //nameLabel and nameField
        nameLabel = [[UILabel alloc] initWithFrame:CGRectMake(120, 95, 150, 40)];
        nameLabel.textColor = [UIColor colorWithRed:106/256.0 green:180/256.0 blue:150/256.0 alpha:1.0];
        nameLabel.font = [UIFont fontWithName:@"Helvetica-Bold" size:25];
        nameLabel.backgroundColor=[tkStyle viewBackgroundColor];
        nameLabel.text=@"Enter Name:";

        nameField = [[UITextField alloc] initWithFrame:CGRectMake(280, 90, 200, 40)];
        nameField.textColor = [UIColor colorWithRed:0/256.0 green:84/256.0 blue:129/256.0 alpha:1.0];
        nameField.font = [UIFont fontWithName:@"Helvetica-Bold" size:25];
        nameField.borderStyle = UITextBorderStyleRoundedRect;
        nameField.backgroundColor=[tkStyle viewBackgroundColor];
        textFieldShouldReturn:nameField.text;

// same for ageField and sexField

        //startButton
    viewRect = CGRectMake(250, sexField.frame.origin.y+75, 200, 40);
    startButton = [[UIButton alloc] initWithFrame:viewRect];
    [startButton setTitle:startButtonLabel forState:UIControlStateNormal];
    [startButton setTitleEdgeInsets:UIEdgeInsetsMake(4, 0, 0, 0)];
    [startButton setButtonIsActive:true];
    //[startButton setOSCAddress:OSCStopPressedString];
    [startButton addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchDown];

    //and so on adjust your view size according to your needs
    [self addSubview:nameField];
    [self addSubview:ageField];
    [self addSubview:sexField];
    [self addSubview:nameLabel];
    [self addSubview:ageLabel];
    [self addSubview:sexLabel];
    [self addSubview:startButton];
}
return self;
}

// that should allow for users to hit 'return' button to move through textfields
-(void)textFieldShouldReturn:(UITextField*)textField;
{
    //[(NSArray *) userInfoArray addObject:textField.text];
}

// that should change Views as soon as the user presses 'Start Experiment'
-(void)buttonAction:(id)sender
{
    [[NSNotificationCenter defaultCenter] postNotificationName:@"startTest" object:self];
}

@end

任何帮助将不胜感激。

Answer 1

NSDictionary 将是一个很好的方法。您可以为每个文本字段值设置唯一键。

Answer 2

-(void)textFieldShouldReturn:(UITextField*)textField;

应该是：

- (BOOL)textFieldShouldReturn:(UITextField*)textField;

另外，不要忘记返回 TRUE 或 FALSE（或 YES 或 NO）。

要完成这项工作，请在您的类中实现 UITextFieldDelegate 协议。

将以下代码行放入您的 .m 文件中，位于 @implementation 上方：

@interface CustomLayout () <UITextFieldDelegate>
@end

然后，在您的 UITextFields 中设置委托：

nameField.delegate = self;
ageField.delegate = self;
sexField.delegate = self;

这样，textFieldShouldReturn: 方法会在用户按下 'enter' 时被调用

Answer 3

有几点：

1. 鉴于您的委托方法，我假设您实际上已将三个 UITextField 控件的 delegate 指定为您已在其中实现这些不同委托方法的对象。

   李>

2. 如果要控制返回键的行为，实现textFieldShouldReturn方法：

   - (BOOL)textFieldShouldReturn:(UITextField *)textField
   {
       if (textField == self.nameField) {
           [self.ageField becomeFirstResponder];
       } else if (textField == self.ageField) {
           [self.sexField becomeFirstResponder];
       } else if (textField == self.sexField) {
           [textField resignFirstResponder];
           [self saveResults];
       }
   
       return NO;
   }
   

   我通常倾向于执行上述操作，按回车键会将我带到下一个字段，然后在最后一个字段上按回车键会关闭键盘并尝试保存结果。

   顺便说一句，在 IB 中，我会确保前两个控件的“返回键”设置为“下一步”，而最后一个控件的“返回键”设置为“开始”或“完成”。

3. 您的保存例程将简单地用三个控件的内容填充一个对象：

   - (void)saveResults
   {
       Person *person = [[Person alloc] init];
   
       person.name = self.nameField.text;
       if (self.ageField.text) {
           person.age = @([self.ageField.text integerValue]);
       }
       person.sex = self.sexField.text;
   
       // now do whatever you want with this object
   }
   

   这显然假设你有一个Person 类：

   @interface Person : NSObject
   @property (nonatomic, copy)   NSString *name;
   @property (nonatomic, strong) NSNumber *age;
   @property (nonatomic, copy)   NSString *sex;
   @end
   
   @implementation Person
   @end
   

   如果您更愿意使用NSDictionary 或NSArray，那也可以（请确保您检查文本字段不是nil），但我个人更喜欢定义明确的模型对象，例如以上。

4. 作为改进，您可能希望确保只输入年龄的数字值（如果您希望这样存储年龄）：

   - (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
   {
       if (textField == self.ageField) {
           NSCharacterSet *invalid = [[NSCharacterSet characterSetWithCharactersInString:@"1234567890"] invertedSet];
           NSRange range = [string rangeOfCharacterFromSet:invalid];
           return range.location == NSNotFound; // if non-numeric character not found, return true
       }
       return YES;
   }