基本属性

    //UITextField, 单行文本输入框, 继承与UIControl
    UITextField *textField = [[UITextField alloc] initWithFrame:CGRectMake(20, 300, 370 - 40, 40)];
    //视图背景颜色
    textField.backgroundColor = [UIColor blackColor];
    //属性
    //占位符(用于提示输入)
    textField.placeholder = @"请输入您的密码";//用作提示输入
    //文本(预先输入的值)
    textField.text = @"";
    //边框样式, 默认: none(没有)
    textField.borderStyle = UITextBorderStyleRoundedRect;
    //文字颜色
    textField.textColor = [UIColor purpleColor];
    
    //设置占位文字颜色
    [textField setValue:[UIColor yellowColor] forKeyPath:@"_placeholderLabel.textColor"];
    //设置光标的颜色
    textField.tintColor = [UIColor whiteColor];

    //字体
    textField.font = [UIFont systemFontOfSize:30];
    //是否安全输入(默认为: NO 关闭安全输入)
    textField.secureTextEntry = YES;
    //重新开始编辑时, 是否清除内容默认: NO(不清除)
    textField.clearsOnBeginEditing = YES;
    //清除按钮的显示模式 :默认 不显示
    //UITextFieldViewModeNever: 不显示
    //UITextFieldViewModeWhileEditing: 编辑时显示
    //UITextFieldViewModeUnlessEditing: 不编辑时显示
    //UITextFieldViewModeAlways: 一直显示(前提是文本框有内容, 没内容时显示的是预输入值)
    textField.clearButtonMode = UITextFieldViewModeAlways;//一直显示
    
    UIButton *clearButton = [textField valueForKey:@"_clearButton"];
    [clearButton setImage:[UIImage imageNamed:@"清除"] forState:UIControlStateNormal];//自定义清除按钮

    //键盘return键样式
    textField.returnKeyType = UIReturnKeyNext;
    //设定代理
    textField.delegate = self;
    //键盘样式
    textField.keyboardType = UIKeyboardTypeDefault;
    //添加方法(文本发生改变时调用)
    [self.simKaHao addTarget:self action:@selector(updataSimNumber:) forControlEvents:(UIControlEventEditingChanged)];

    [self.view addSubview:textField];

UITextFieldDelegate

#pragma mark ------> UITextFieldDelegate



/**
 是否允许编辑
 @return YES:允许编辑, NO:不允许编辑
 */
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
    
    return YES;
}

/**
 成为第一响应者时的代理回调(开始编辑时)
 */
- (void)textFieldDidBeginEditing:(UITextField *)textField {
    NSLog(@"已经开始编辑");
}

/**
 将要结束编辑
 @return YES:允许结束编辑, NO:不允许结束编辑
 */
- (BOOL)textFieldShouldEndEditing:(UITextField *)textField {
    return YES;
}
/**
 已经结束编辑(iOS10及以上可用)
 */
- (void)textFieldDidEndEditing:(UITextField *)textField {
    NSLog(@"已经结束编辑老");
}

/**
 已经结束编辑(iOS10及以上可用, 如果此方法被调用,则textFieldDidEndEditing:方法就不被调用)
 */
- (void)textFieldDidEndEditing:(UITextField *)textField reason:(UITextFieldDidEndEditingReason)reason NS_AVAILABLE_IOS(10_0) {
    NSLog(@"已经结束编辑新");
}


/**
 文本将要更改时调用
 @param range 范围
 @param string 将要更改的字符串
 @return YES:更改文本, NO:不更改文本
 */
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
    return YES;
}


/**
 点击清除按钮时调用(执行清除方法时调用)
 @return YES:允许清除, NO:不允许清除
 */
- (BOOL)textFieldShouldClear:(UITextField *)textField {
    NSLog(@"点击了清除按钮");
    return YES;
}


/**
 点击return按钮时调用
 @return 如果执行默认行为则返回YES, 否则返回NO(暂时木有没有发现有啥用)
 */
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
    NSLog(@"点击返回按钮");
    [textField resignFirstResponder];
    return NO;
}

return样式

1. UIReturnKeyDefault, //默认：灰色按钮，标有Return
2. UIReturnKeyGo, //标有Go的蓝色按钮
3. UIReturnKeyGoogle, //标有Google的蓝色按钮，用于搜索
4. UIReturnKeyJoin, //标有Join的蓝色按钮
5. UIReturnKeyNext, //标有Next的蓝色按钮
6. UIReturnKeyRoute, //标有Route的蓝色按钮
7. UIReturnKeySearch, //标有Search的蓝色按钮
8. UIReturnKeySend, //标有Send的蓝色按钮
9. UIReturnKeyYahoo, //标有Yahoo!的蓝色按钮，用于搜索
10. UIReturnKeyDone, //标有Done的蓝色按钮
11. UIReturnKeyEmergencyCall, //紧急呼叫按钮

键盘样式：

1. UIKeyboardTypeASCIICapable和UIKeyboardTypeAlphabet

   
   
   UIKeyboardTypeASCIICapable.png

2. UIKeyboardTypeNumbersAndPunctuation

   
   
   UIKeyboardTypeNumbersAndPunctuation.png

3. UIKeyboardTypeURL

   
   
   UIKeyboardTypeURL.png

4. UIKeyboardTypeNumberPad

   
   
   UIKeyboardTypeNumberPad.png

5. UIKeyboardTypePhonePad

   
   
   UIKeyboardTypePhonePad.png

6. UIKeyboardTypeNamePhonePad

   
   
   UIKeyboardTypeNamePhonePad.png
   
   

   UIKeyboardTypeNamePhonePad123

   
   
   UIKeyboardTypeNamePhonePad123.png

7. UIKeyboardTypeEmailAddress

   
   
   UIKeyboardTypeEmailAddress.png
   
   

   UIKeyboardTypeEmailAddress123

   
   
   UIKeyboardTypeEmailAddress123.png

8. UIKeyboardTypeDecimalPad

   
   
   UIKeyboardTypeDecimalPad.png

9. UIKeyboardTypeTwitter

   
   
   UIKeyboardTypeTwitter.png
   
   

   UIKeyboardTypeTwitter123

   
   
   UIKeyboardTypeTwitter123.png

10. UIKeyboardTypeWebSearch

    
    
    UIKeyboardTypeWebSearch.png
    
    

    UIKeyboardTypeWebSearch123

    
    
    UIKeyboardTypeWebSearch123.png

11. UIKeyboardTypeASCIICapableNumberPad

    
    
    UIKeyboardTypeASCIICapableNumberPad.png