如何以编程方式禁用 UITextField 中的复制粘贴选项

Question

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他们的注册号。一切几乎都是他们的，但是我想以编程方式从文本字段中删除复制粘贴功能，因为它们不是文本字段的 InterfaceBuilder 版本，我不知道如何执行此操作..

这是迄今为止我的 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];

}

Answer 1

这篇文章有很多不错的解决方案：如何禁用复制、剪切、选择，在 UITextView 中全选

我最喜欢的是重写 canPerformAction:withSender:：

- (BOOL)canPerformAction:(SEL)action withSender:(id)sender
{
    if (action == @selector(paste:))
        return NO;
    return [super canPerformAction:action withSender:sender];
}

Answer 2

故事板用户可能想看看这个解决方案，只要您同意子类化即可。

我认为没有一种简单的方法可以通过扩展或协议来实现这一目标。

Swift 3.1

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)
        }
    }
}

要点链接

Answer 3

对于 iOS8.0+、Xcode 6.0.1，启用了 ARC

希望为像我这样的初学者节省一些时间实现此...

实现禁用复制/粘贴/剪切/等。您必须子类化 UITextField 并覆盖...

- (BOOL)canPerformAction:(SEL)action withSender:(id)sender

要执行此操作...

创建一个新类，该类是 UITextField 的子类（即要包含在应用程序文件夹中的新 .h 和 .m 文件） 。所以文件->新建->“Cocoa Touch Class”->下一步->“PasteOnlyUITextField”（例如），“UITextField”的子类->下一步->创建。

一旦为名为“PasteOnlyUITextField”的 UITextField 新子类创建了 .h 和 .m 文件...

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

现在请确保在您所在的位置导入 PasteOnlyUITextField.h要使用它，例如 YourUIViewController.h 文件...

#import "PasteOnlyUITextField.h"

现在您必须使用子类，无论是按编程方式还是使用标识检查器

PasteOnlyUITextField *pasteOnlyUITextField = [[PasteOnlyUITextField alloc] init...];

或...

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...

希望这有帮助！感谢所有原始贡献者。

Answer 4

我找到了一种快速使用扩展和关联对象而不需要子类化的方法。
我使用只读属性来禁用粘贴/剪切，但可以调整此示例。

Swift 3 截至 2016 年 11 月 27 日更新

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)
    }

}

Answer 5

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），请在 UITextFieldDelegate 中使用它。

func textFieldShouldBeginEditing(_ textField: UITextField) -> Bool {
    textField.isUserInteractionEnabled = false
    return true
}

func textFieldDidEndEditing(_ textField: UITextField) {
    textField.isUserInteractionEnabled = true
}

Answer 6

在 ViewController.m 中实现此方法此方法将帮助您禁用 UITextField 上的选项。

它包括相应 UITextField 上的粘贴、选择、全选和复制选项。

当您想将其用作密码或 DateOfBirth 或任何您想要的内容时，此方法在 UITextField 的情况下非常有用。

- (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];
}

Answer 7

在 iOS 9 中，我们可以隐藏键盘上的复制​​粘贴栏

-(void) customMethod{

   yourTextField.inputAssistantItem.leadingBarButtonGroups = @[];
   yourTextField.inputAssistantItem.trailingBarButtonGroups = @[];

}

Answer 8

斯威夫特 5 解决方案：

override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {
    if action == #selector(UIResponderStandardEditActions.copy(_:)) || action == #selector(UIResponderStandardEditActions.paste(_:)) {
        return false
    }

    return true
}

Answer 9

针对 iOS 10 及更早版本 (Swift 3) 的此答案的小更新：

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)
}

Answer 10

在你的 viewController 中尝试一下

- (BOOL)canPerformAction:(SEL)action withSender:(id)sender {
        [[NSOperationQueue mainQueue] addOperationWithBlock:^{
            [[UIMenuController sharedMenuController] setMenuVisible:NO animated:NO];
        }];
        return [super canPerformAction:action withSender:sender];
    }

Answer 11

禁用 UITextField 子类的所有操作。

import UIKit

class CustomTextField: UITextField {
    override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {
        return false
    }
}

Answer 12

您可以在 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
    }
}

Answer 13

如果禁用文本选择适合您，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 }
    }
}

Answer 14

恕我直言，覆盖 targetForAction:withSender 是最好的：

- (id)targetForAction:(SEL)action withSender:(id)sender
{
    if (action == @selector(paste:)) {
        return nil;
    }
    return [super targetForAction:action withSender:sender];
}

Answer 15

斯威夫特3.0版本

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)
    }
}

Answer 16

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];

}

Answer 17

只需设置 userInteractionEnabled = NO;