以編程方式將數據從UITextFields存儲到NSArray中iOS

Question

我想先說我對iOS編程相當陌生，所以請原諒我的無知。

我在我的CustomLayout中有三個UITextFields。我要求用戶填寫他們的姓名，年齡和性別。如果可能的話，我想要兩件事。首先，我希望，只要用戶點擊鍵盤上的返回按鈕，輸入字符串將存儲在NSArray中。另外，第二個目標是當用戶點擊相同的按鈕時遍歷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 

在實現文件

//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 

任何幫助，將不勝感激。

Answer 1

NSDictionary將是一個很好的方法。您可以爲每個文本字段值設置唯一的密鑰。

Answer 2

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

應該是：

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

另外，不要忘了返回TRUE或FALSE（或YES或NO）。

要做到這一點，請在您的類中實現UITextFieldDelegate協議。

把下面的代碼行中的.m文件，在@implementation以上：

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

這樣的textFieldShouldReturn：

@interface CustomLayout() <UITextFieldDelegate> 
@end 

然後，用設置委託在UITextFields：方法將在用戶按下'輸入'時調用

Answer 3

幾件事：

1. 鑑於您的委託方法，我假設您已經爲您的三個UITextField控件實際指定了delegate作爲您實現這些各種委託方法的對象。

2. 如果你想控制的返回鍵的行爲，實現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; 
   } 
   

   我一般會傾向於做一些像上文中，按回車鍵帶我到下一個字段，並在最後一個鍵上按下返回鍵來解除鍵盤並嘗試保存結果。

   順便說一下，在IB中，我會確保前兩個控件的「返回鍵」設置爲「下一步」，最後一個設置爲「開始」或「完成」。

3. 您節省日常只會填充對象的三個控件的內容：

   - (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 
   } 
   

   顯然，這假設你有一個Person類：

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

   如果你寧願使用NSDictionary或NSArray，這也很好（但請確保您檢查的文本字段不是nil，雖然），但我個人更喜歡上面定義好的模型對象。

4. 作爲改進，您可能希望確保只對年齡輸入數值（如果這就是你想要保存的年齡）：

   - (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; 
   }