我正在制作一个注册警报视图，其中有一个UITextField，用户可以在其中输入注册号。一切都是他们的，但我想以编程方式从文本字段中删除复制粘贴功能，因为他们没有InterfaceBuilder版本的文本字段我不知道如何做到这一点..
这是我到目前为止的UIalertview ......
- (void)pleaseRegisterDevice {
UIAlertView *myAlertView = [[UIAlertView alloc] initWithTitle:@"Please Register Device!" message:@"this gets covered" delegate:self cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
regTextField = [[UITextField alloc] initWithFrame:CGRectMake(12.0, 45.0, 260.0, 25.0)];
[regTextField setBackgroundColor:[UIColor whiteColor]];
regTextField.textAlignment = UITextAlignmentCenter;
[myAlertView addSubview:regTextField];
[myAlertView show];
[myAlertView release];
}
这篇文章有很多很好的解决方案：How disable Copy, Cut, Select, Select All in UITextView
我最喜欢的是覆盖canPerformAction:withSender:：
- (BOOL)canPerformAction:(SEL)action withSender:(id)sender
{
if (action == @selector(paste:))
return NO;
return [super canPerformAction:action withSender:sender];
}
在viewController中尝试这个
- (BOOL)canPerformAction:(SEL)action withSender:(id)sender {
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
[[UIMenuController sharedMenuController] setMenuVisible:NO animated:NO];
}];
return [super canPerformAction:action withSender:sender];
}
你可以在swift中扩展textview或textfield，如下所示：
extension UITextView {
open override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {
return false
}
}
覆盖targetForAction：withSender是最好的恕我直言：
- (id)targetForAction:(SEL)action withSender:(id)sender
{
if (action == @selector(paste:)) {
return nil;
}
return [super targetForAction:action withSender:sender];
}
Swift 3.0版
class NoMenuTextField: UITextField {
override func canPerformAction(action: Selector, withSender sender: AnyObject?) -> Bool {
if (action == #selector(NSObject.paste(_:))) {
return false
}
return super.canPerformAction(action, withSender: sender)
}
}
用于iOS 7或更高版本
- (BOOL)canPerformAction:(SEL)action withSender:(id)sender {
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
[[UIMenuController sharedMenuController] setMenuVisible:NO animated:NO];
}];
return [super canPerformAction:action withSender:sender];
}
只需设置userInteractionEnabled = NO;
对于iOS8.0 +，Xcode 6.0.1，启用了ARC
希望像我一样拯救一个初学者，一段时间实现这个......
实现禁用复制/粘贴/剪切/等。你必须继承UITextField并覆盖...
- (BOOL)canPerformAction:(SEL)action withSender:(id)sender
去做这个...
创建一个新类，它是UITextField的子类（即要包含在app文件夹中的新.h和.m文件）。所以File-> New - >“Cocoa Touch Class” - > Next - >“PasteOnlyUITextField”（例如），“UITextField” - > Next-> Create的子类。
一旦为我们新的UITextField子类创建了.h和.m文件，名为“PasteOnlyUITextField”......
PasteOnlyUITextField.h
#import <UIKit/UIKit.h>
@interface PasteOnlyUITextField : UITextField
@end
PasteOnlyUITextField.m
#import "PasteOnlyUITextField.h"
@implementation PasteOnlyUITextField
/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
// Drawing code
}
*/
- (BOOL)canPerformAction:(SEL)action withSender:(id)sender
{
if (action == @selector(paste:))
{
return true;
}
return false;
}
@end
现在请确保将PasteOnlyUITextField.h导入到要使用它的位置，例如YourUIViewController.h文件......
#import "PasteOnlyUITextField.h"
现在，您必须以progromically方式或使用身份检查器来使用子类
PasteOnlyUITextField *pasteOnlyUITextField = [[PasteOnlyUITextField alloc] init...];
要么...
选择UITextField并转到身份检查器，选择其类。
您可以根据需要更改与菜单选项关联的逻辑...
希望这可以帮助！感谢所有原始贡献者。
我找到了一种方法，使用swift使用扩展和关联对象而不进行子类化。我使用readonly属性来禁用粘贴/剪切，但可以调整此示例。
Swift 3自2016年11月27日起更新
var key: Void?
class UITextFieldAdditions: NSObject {
var readonly: Bool = false
}
extension UITextField {
var readonly: Bool {
get {
return self.getAdditions().readonly
} set {
self.getAdditions().readonly = newValue
}
}
private func getAdditions() -> UITextFieldAdditions {
var additions = objc_getAssociatedObject(self, &key) as? UITextFieldAdditions
if additions == nil {
additions = UITextFieldAdditions()
objc_setAssociatedObject(self, &key, additions!, objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN)
}
return additions!
}
open override func target(forAction action: Selector, withSender sender: Any?) -> Any? {
if ((action == #selector(UIResponderStandardEditActions.paste(_:)) || (action == #selector(UIResponderStandardEditActions.cut(_:)))) && self.readonly) {
return nil
}
return super.target(forAction: action, withSender: sender)
}
}
其他Swift（2.2）
import UIKit
var key: Void?
class UITextFieldAdditions: NSObject {
var readonly: Bool = false
}
extension UITextField {
var readonly: Bool {
get {
return self.getAdditions().readonly
}
set {
self.getAdditions().readonly = newValue
}
}
private func getAdditions() -> UITextFieldAdditions {
var additions = objc_getAssociatedObject(self, &key) as? UITextFieldAdditions
if additions == nil {
additions = UITextFieldAdditions()
objc_setAssociatedObject(self, &key, additions!, objc_AssociationPolicy(OBJC_ASSOCIATION_RETAIN_NONATOMIC))
}
return additions!
}
public override func targetForAction(action: Selector, withSender sender: AnyObject?) -> AnyObject? {
if ((action == Selector("paste:") || (action == Selector("cut:"))) && self.readonly) {
return nil
}
return super.targetForAction(action, withSender: sender)
}
}
故事板用户可能希望查看此解决方案，只要您可以使用子类化。
我认为通过扩展或协议实现这一目标并不容易。
import UIKit
@IBDesignable
class CustomTextField: UITextField {
@IBInspectable var isPasteEnabled: Bool = true
@IBInspectable var isSelectEnabled: Bool = true
@IBInspectable var isSelectAllEnabled: Bool = true
@IBInspectable var isCopyEnabled: Bool = true
@IBInspectable var isCutEnabled: Bool = true
@IBInspectable var isDeleteEnabled: Bool = true
override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {
switch action {
case #selector(UIResponderStandardEditActions.paste(_:)) where !isPasteEnabled,
#selector(UIResponderStandardEditActions.select(_:)) where !isSelectEnabled,
#selector(UIResponderStandardEditActions.selectAll(_:)) where !isSelectAllEnabled,
#selector(UIResponderStandardEditActions.copy(_:)) where !isCopyEnabled,
#selector(UIResponderStandardEditActions.cut(_:)) where !isCutEnabled,
#selector(UIResponderStandardEditActions.delete(_:)) where !isDeleteEnabled:
return false
default:
//return true : this is not correct
return super.canPerformAction(action, withSender: sender)
}
}
}
在ViewController.m中实现此方法此方法将帮助您禁用UITextField上的选项。
它包括您的Corresponding UITextField上的paste，select，selectAll和copy选项。
这个方法在UITextField的情况下非常有用，当你想把它用于密码或DateOfBirth或任何你想要的。
- (BOOL)canPerformAction:(SEL)action withSender:(id)sender {
if ((_TextField1 isFirstResponder] || [_TextFied2 isFirstResponder]) {
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
[[UIMenuController sharedMenuController] setMenuVisible:NO animated:NO];
}];
}
return [super canPerformAction:action withSender:sender];
}
在iOS 9中，我们可以从键盘隐藏复制粘贴栏
-(void) customMethod{
yourTextField.inputAssistantItem.leadingBarButtonGroups = @[];
yourTextField.inputAssistantItem.trailingBarButtonGroups = @[];
}
适用于iOS 10及更早版本（Swift 3）的this answer的小更新：
open override func target(forAction action: Selector, withSender sender: Any?) -> Any? {
guard isReadonly else {
return super.target(forAction: action, withSender: sender)
}
if #available(iOS 10, *) {
if action == #selector(UIResponderStandardEditActions.paste(_:)) {
return nil
}
} else {
if action == #selector(paste(_:)) {
return nil
}
}
return super.target(forAction: action, withSender: sender)
}
注意：在Swift中，如果您希望文本字段禁用所有UIResponderStandardEditActions（剪切，复制，粘贴，查找，共享，选择），请使用UITextFieldDelegate。
func textFieldShouldBeginEditing(_ textField: UITextField) -> Bool {
textField.isUserInteractionEnabled = false
return true
}
func textFieldDidEndEditing(_ textField: UITextField) {
textField.isUserInteractionEnabled = true
}
如果禁用的文本选择适合您，请尝试此操作。
class NoMoreSelectionTextField: UITextField {
override func caretRect(for position: UITextPosition) -> CGRect {
return CGRect.zero
}
override var selectedTextRange: UITextRange? {
get { return nil }
set { return }
}
}