Question

我首先要说的是我对iOS编程很新，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，输入字符串将存储在NSArray中。此外，次要目标是在用户点击相同按钮时迭代UITextField。

// 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

在实施档案

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

任何帮助都将不胜感激。

Answer 1

NSDictionary将是一个很好的方法。您可以为每个文本字段值使用唯一键。

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）。

要使其工作，请在您的类中实现UITextFieldDelegate协议。

将以下代码行放在.i文件中，@ implementation：

上方

@interface CustomLayout () <UITextFieldDelegate>
@end

然后，使用以下命令在UITextFields中设置委托：

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

这样当用户按下＆＃39;输入＆＃39;

时，将调用textFieldShouldReturn：方法

Answer 3

有几件事：

根据您的委托方法，我假设您实际上已将三个delegate控件的UITextField指定为您已在其中实施这些各种委托的对象方法
如果要控制返回键的行为，请实现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;
}
```
我通常倾向于做类似上面的事情，按下返回将我带到下一个字段，按下最后一个字段的返回将解除键盘并尝试保存结果。
顺便说一下，在IB中，我确保＆＃34;返回键＆＃34;前两个控件的设置为＆＃34; Next＆＃34;，最后一个控件的设置为＆＃34; Go＆＃34;或者＆＃34;完成＆＃34;。

您的保存例程只会使用三个控件的内容填充对象：

- (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
}

这显然假设您有一个Person类：

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

@implementation Person
@end

如果您更倾向于使用NSDictionary或NSArray，那也很好（请确保您检查的文字字段不是nil）虽然我个人更喜欢上面定义良好的模型对象。

作为一项改进，您可能希望确保只输入年龄的数值（如果您想要存储年龄的话）：

- (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;
}

以编程方式将来自UITextFields的值存储在NSArray中

3 个答案: