为什么使用不同的输入类型？

键盘输入的类型帮助我们从用户获取必需的输入。

它移除不需要的键，并包括所需的部分。用户可以通过使用 UITextField 的键盘属性设置输入的类型。

如：文本字段( textField)。  keyboardType = UIKeyboardTypeDefault

键盘输入类型

输入的类型

描述

UIKeyboardTypeASCIICapable

键盘包括所有标准的 ASCII 字符。

UIKeyboardTypeNumbersAndPunctuation

键盘显示数字和标点。

UIKeyboardTypeURL

键盘的 URL 项优化。

UIKeyboardTypeNumberPad

键盘用于 PIN 输入和显示一个数字键盘。

UIKeyboardTypePhonePad

键盘对输入电话号码进行了优化。

UIKeyboardTypeNamePhonePad

键盘用于输入姓名或电话号码。

UIKeyboardTypeEmailAddress

键盘对输入电子邮件地址的优化。

UIKeyboardTypeDecimalPad

键盘用来输入十进制数字。

UIKeyboardTypeTwitter

键盘对 twitter @ 和 # 符号进行了优化。

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];

}

在 ViewController.m 中更新 viewDidLoad，如下所示

(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

现在当我们运行应用程序时我们就会得到下面的输出:

选择不同的文本区域我们将看到不同的键盘。