ios UITextField

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加入TextFieldDelagate

@interface RootViewController () <UITextFieldDelegate>

@property (nonatomic, strong) UITextField *usernameTextField;

@property (nonatomic, strong) UITextField *passwordTextField;

 @end

#pragma mark - 创建textField

    // 移除view1 view2

    [view1 removeFromSuperview];

    [view2 removeFromSuperview];

    // 1. 初始化

    UITextField *usernameTextField =

    [[UITextField alloc] initWithFrame:CGRectMake(0, 150, 375, 30)];

    // 2. 配置属性

    // 2.1 配置边框

    usernameTextField.borderStyle = UITextBorderStyleRoundedRect;

    // 2.2 配置纠正自动大小写

    usernameTextField.autocapitalizationType = UITextAutocapitalizationTypeNone;

    // 2.3 配置自动纠正功能

    usernameTextField.autocorrectionType = UITextAutocorrectionTypeNo;

    // 2.4 配置键盘

    usernameTextField.keyboardType = UIKeyboardTypeNumberPad;

    // 2.5 配置return键

    usernameTextField.returnKeyType = UIReturnKeyDone;

    // 2.6 配置清除属性

    usernameTextField.clearButtonMode = UITextFieldViewModeWhileEditing;

    // 2.7 leftView

//    usernameTextField.leftView = 图片视图

//    usernameTextField.leftViewMode = UITextFieldViewModeAlways

    // 3. 添加到父视图

    [self.view addSubview:usernameTextField];

#pragma mark - 密码文本框

    // 1. 初始化

    UITextField *passwordTextField = [[UITextField alloc] initWithFrame:CGRectMake(0, 200, 375, 30)];

    // 2. 配置属性

    // 2.1 配置安全输入

    passwordTextField.secureTextEntry = YES;

    // 2.2 配置边框

    passwordTextField.borderStyle = UITextBorderStyleRoundedRect;

    // 3. 添加到父视图

    [self.view addSubview:passwordTextField];

    // 4. 设置委托人

    usernameTextField.delegate = self;

    passwordTextField.delegate = self;=

    // 进行属性关联

    self.usernameTextField = usernameTextField;

    self.passwordTextField = passwordTextField;

#pragma mark - UITextFieldDelegate methods

// 是否进行返回

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

    // 失去焦点

    [textField resignFirstResponder];

    return YES;

}

// 是否用字符串替换某个范围的字符串

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {

    NSLog(@"range = %@, string = %@", NSStringFromRange(range), string);

    // 获取文本框中的字符串

    NSString *text = textField.text;

    // 长度限定

    if (text.length + string.length > 10) {

        return NO;

    }

    // 内容限定

//    NSPredicate  谓词

    return YES;

}

ios UITextField

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原文地址：http://www.cnblogs.com/HwangKop/p/4743272.html