将"清除"按钮添加到iPhone UITextField

Question

如何在UITextField的右侧添加清除文本的小"X"按钮？我找不到在iPhone OS 2.2 SDK中在Interface Builder中添加此子控件的属性.

注意:在Xcode 4.x及更高版本(iPhone 3.0 SDK及更高版本)中,您可以在Interface Builder中执行此操作.

Answer 1

此按钮是由UITextField类提供的内置覆盖,但是从iPhone OS 2.2 SDK开始,没有任何方法可以通过Interface Builder进行设置.您必须以编程方式启用它.

在某处添加这行代码(例如viewDidLoad):

myUITextField.clearButtonMode = UITextFieldViewModeWhileEditing;

更新:最新版本的Xcode IB确实支持此属性.

Answer 2

您也可以直接在Attributes Inspector下的Interface Builder中设置它.

取自XCode 5.1

Answer 3

斯威夫特3:

textField.clearButtonMode = UITextField.ViewMode.whileEditing

甚至更短:

textField.clearButtonMode = .whileEditing

Answer 4

你可以使用这个添加自定义清除按钮并控制大小和每件事:

UIButton *clearButton = [UIButton buttonWithType:UIButtonTypeCustom];
[clearButton setImage:img forState:UIControlStateNormal];
[clearButton setFrame:frame];
[clearButton addTarget:self action:@selector(clearTextField:) forControlEvents:UIControlEventTouchUpInside];

textField.rightViewMode = UITextFieldViewModeAlways; //can be changed to UITextFieldViewModeNever,    UITextFieldViewModeWhileEditing,   UITextFieldViewModeUnlessEditing
[textField setRightView:clearButton];

Answer 5

目标C:

self.txtUserNameTextfield.myUITextField.clearButtonMode = UITextFieldViewModeWhileEditing;

斯威夫特:

txtUserNameTextfield.clearButtonMode = UITextField.ViewMode.WhileEditing;

Answer 6

斯威夫特4（改编自克里斯托弗·约翰逊的答案）

textfield.clearButtonMode = .always

textfield.clearButtonMode = .whileEditing

textfield.clearButtonMode = .unlessEditing

textfield.clearButtonMode = .never

Answer 7

这不起作用,跟我一样:

迅速:

customTextField.clearButtonMode = UITextField.ViewMode.Always

customTextField.clearsOnBeginEditing = true;

func textFieldShouldClear(textField: UITextField) -> Bool {
    return true
}

Answer 8

在Xcode 8（8A218a）上：

迅速：

textField.clearButtonMode = UITextField.ViewMode.whileEditing;

“ W”从大写字母变为非大写的“ w”。