Custom UITextField clear button

问题

Is it possible to customize the image of the clear button in a UITextField? I have a dark textfield background and the "x" is not visible enough.

回答1:

You can set your own custom clear button to the text field's rightView property. Make sure set the rightViewMode property to UITextFieldViewModeWhileEditing or UITextFieldViewModeAlways, whatever makes sense for your case.

If the button's position isn't right for your need, you can subclass UITextField and override the rightViewRectForBounds: method.

The documentation says the default for the clearButtonMode property is UITextFieldViewModeNever, but I suspect Interface Builder may set it to UITextFieldViewModeWhileEditing - Make sure you set it to the "never" value so it doesn't appear.

All these properties are documented in UITextField Class Reference.

回答2:

You can access that property using KVO:

UIButton *clearButton = [myTextField valueForKey:@"_clearButton"];
[clearButton setImage:[UIImage new] forState:UIControlStateNormal];

回答3:

Tested iOS7.0 - 8.4

It is possible to update the backgroundImage of all clear buttons using the following UIAppearance method. Unfortunately you cannot update the image of the button:

UIButton *defaultClearButton = [UIButton appearanceWhenContainedIn:[UITextField class], nil];
[defaultClearButton setBackgroundImage:[UIImage imageNamed:@"clearButtonBkg1.png"] forState:UIControlStateNormal];

Using the following images, this results in the following clear button:

White background image @3x:

Note: This will update the background image of ALL buttons contained in textfields

回答4:

Swift 2.2+ / iOS 9+ version of @Brody Robertson's answer:

let defaultClearButton = UIButton.appearanceWhenContainedInInstancesOfClasses([UITextField.self])
defaultClearButton.setBackgroundImage(UIImage(named: "ClearIcon"), forState: UIControlState.Normal)

回答5:

depends on @Tuss László's answer

Swift 3.0

myTextField.clearButtonMode = .whileEditing
if let clearButton = myTextField.value(forKeyPath: "_clearButton") as? UIButton {
    clearButton.setImage(UIImage(named:"myImage"), for: .normal)
    clearButton.setImage(UIImage(named:"myImage"), for: .highlighted)
}

But really use it carefully. If Apple change implementations in future iOS releases, it would not be work

回答6:

Swift 3

let customClearButton = UIButton.appearance(whenContainedInInstancesOf: [UITextField.self])
customClearButton.setBackgroundImage(UIImage(named: "custom_cb"), for: .normal)

回答7:

One approach would be to create a custom UITextField that has your desired image as a subview and clears the parent text field when tapped. You disable the default button and add your custom behavior in this custom text field.

This should get you started. If there are any more concrete questions, feel free to edit your question or comment here if it's a minor problem.

来源：https://stackoverflow.com/questions/9239328/custom-uitextfield-clear-button

标签

objective-c

ios

uitextfield