IOS - 输入类型 - 文本字段

• 

  为什么是输入类型？

  键盘输入类型帮助我们从用户那里获得所需的输入。它会删除不需要的键并包含需要的键。我们可以使用 UITextField 的键盘属性设置用户可以提供的输入类型。

  • 例如：文本字段。键盘类型 = UIKeyboardTypeDefault

  键盘输入类型

  序号	输入类型和描述
  1	UIKeyboardTypeASCIICapable 键盘包括所有标准 ASCII 字符。
  2	UIKeyboardTypeNumbersAndPunctuation 一旦显示，键盘就会显示数字和标点符号。
  3	UIKeyboardTypeURL 键盘针对 URL 输入进行了优化。
  4	UIKeyboardTypeNumberPad 键盘用于 PIN 输入并显示数字键盘。
  5	UIKeyboardTypePhonePad 键盘针对输入电话号码进行了优化。
  6	UIKeyboardTypeNamePhonePad 键盘用于输入姓名或电话号码。
  7	UIKeyboardTypeEmailAddress 键盘针对输入电子邮件地址进行了优化。
  8	UIKeyboardTypeDecimalPad 键盘用于输入十进制数。
  9	UIKeyboardTypeTwitter 键盘针对 Twitter 进行了优化，带有 @ 和 # 符号。

  添加自定义方法 addTextFieldWithDifferentKeyboard

  
  -(void) addTextFieldWithDifferentKeyboard {
     UITextField *textField1= [[UITextField alloc]initWithFrame: 
     CGRectMake(20, 50, 280, 30)];
     textField1.delegate = self;
     textField1.borderStyle = UITextBorderStyleRoundedRect;
     textField1.placeholder = @"Default Keyboard";
     [self.view addSubview:textField1];
     UITextField *textField2 = [[UITextField alloc]initWithFrame:
     CGRectMake(20, 100, 280, 30)];
     textField2.delegate = self;
     textField2.borderStyle = UITextBorderStyleRoundedRect;
     textField2.keyboardType = UIKeyboardTypeASCIICapable;
     textField2.placeholder = @"ASCII keyboard";
     [self.view addSubview:textField2];
     UITextField *textField3 = [[UITextField alloc]initWithFrame:
     CGRectMake(20, 150, 280, 30)];
     textField3.delegate = self;
     textField3.borderStyle = UITextBorderStyleRoundedRect;
     textField3.keyboardType = UIKeyboardTypePhonePad;
     textField3.placeholder = @"Phone pad keyboard";
     [self.view addSubview:textField3];
     UITextField *textField4 = [[UITextField alloc]initWithFrame:
     CGRectMake(20, 200, 280, 30)];
     textField4.delegate = self;
     textField4.borderStyle = UITextBorderStyleRoundedRect;
     textField4.keyboardType = UIKeyboardTypeDecimalPad;
     textField4.placeholder = @"Decimal pad keyboard";
     [self.view addSubview:textField4];
     UITextField *textField5= [[UITextField alloc]initWithFrame:
     CGRectMake(20, 250, 280, 30)];
     textField5.delegate = self;
     textField5.borderStyle = UITextBorderStyleRoundedRect;
     textField5.keyboardType = UIKeyboardTypeEmailAddress;
     textField5.placeholder = @"Email keyboard";
     [self.view addSubview:textField5];
     UITextField *textField6= [[UITextField alloc]initWithFrame:
     CGRectMake(20, 300, 280, 30)];
     textField6.delegate = self;
     textField6.borderStyle = UITextBorderStyleRoundedRect;
     textField6.keyboardType = UIKeyboardTypeURL;
     textField6.placeholder = @"URL keyboard";
     [self.view addSubview:textField6];
  }
  

  更新 ViewController.m 中的 viewDidLoad 如下 -

  
  (void)viewDidLoad {
     [super viewDidLoad];
     //The custom method to create textfield with different keyboard input
     [self addTextFieldWithDifferentKeyboard];
     //Do any additional setup after loading the view, typically from a nib
  }
  

  输出

  当我们运行应用程序时，我们将获得以下输出 -

  

  我们将看到在选择每个文本字段时显示不同的键盘。