选择一个 textView 里面没有选择文本？

Question

我在UITableViewCell 中有一个UITextView。 UITextView 我希望是可选择的，但不是文本。当Menu Controller 出现并且我想执行复制操作时，复制里面的所有文本而不仅仅是一部分。

我想要类似信使应用的东西：

目前我有：

提前感谢您！

Answer 1

事实上，这并不容易，因为在路上会出现一些奇怪的东西，但我设法创建了一个自定义的。

步骤如下：

1. 创建UITextView 的子类
2. 覆盖canPerformAction: withSender:以过滤菜单的默认操作 弹出。
3. 配置textView 以便无法编辑或 选择。
4. 编辑UIMenuController 提供菜单上的操作和按钮的项目
5. 为每个UIMenuItem ****添加不同的选择器（这是因为选择器的发送者不是UIMenuItem，而是UIMenuController，这导致了另一件事。查看here了解更多信息。一个gist我为此）

代码

废话不多说，代码如下：

EBCustomTextView.h

//
//  EBCustomTextView.h
//  TestProject
//
//  Created by Erid Bardhaj on 3/8/16.
//  Copyright © 2016 Erid Bardhaj. All rights reserved.
//

#import <UIKit/UIKit.h>

typedef NS_ENUM(NSInteger, EBCustomTextViewMenuAction) {
    EBCustomTextViewMenuActionCopy,
    EBCustomTextViewMenuActionDefine,
    EBCustomTextViewMenuActionRead
};

@class EBCustomTextView;
@protocol EBCustomTextViewMenuActionDelegate <NSObject>

- (void)customTextView:(EBCustomTextView *)textView didSelectMenuAction:(EBCustomTextViewMenuAction)action;

@end

@interface EBCustomTextView : UITextView

@property (weak, nonatomic) id<EBCustomTextViewMenuActionDelegate> menuActionDelegate;

@end

EBCustomTextView.m

//
//  EBCustomTextView.m
//  TestProject
//
//  Created by Erid Bardhaj on 3/8/16.
//  Copyright © 2016 Erid Bardhaj. All rights reserved.
//

#import "EBCustomTextView.h"

@implementation EBCustomTextView {
    EBCustomTextViewMenuAction currentAction;
}

- (void)awakeFromNib {
    [super awakeFromNib];

    // Configure the textView
    self.editable = NO;
    self.selectable = NO;
}

#pragma mark - Datasource

- (NSArray *)items {
    UIMenuItem *item = [[UIMenuItem alloc] initWithTitle:@"Copy" action:@selector(copyMenuItemPressed)];
    UIMenuItem *item1 = [[UIMenuItem alloc] initWithTitle:@"Define" action:@selector(defineMenuItemPressed)];
    UIMenuItem *item2 = [[UIMenuItem alloc] initWithTitle:@"Read" action:@selector(readMenuItemPressed)];

    return @[item, item1, item2];
}


#pragma mark - Actions

- (void)copyMenuItemPressed {
    if ([self.menuActionDelegate respondsToSelector:@selector(customTextView:didSelectMenuAction:)]) {
        [self.menuActionDelegate customTextView:self didSelectMenuAction:EBCustomTextViewMenuActionCopy];
    }
}

- (void)defineMenuItemPressed {
    if ([self.menuActionDelegate respondsToSelector:@selector(customTextView:didSelectMenuAction:)]) {
        [self.menuActionDelegate customTextView:self didSelectMenuAction:EBCustomTextViewMenuActionDefine];
    }
}

- (void)readMenuItemPressed {
    if ([self.menuActionDelegate respondsToSelector:@selector(customTextView:didSelectMenuAction:)]) {
        [self.menuActionDelegate customTextView:self didSelectMenuAction:EBCustomTextViewMenuActionRead];
    }
}

#pragma mark - Private

- (void)menuItemPressedAtIndex:(NSInteger)index {
    currentAction = index;

    if ([self.menuActionDelegate respondsToSelector:@selector(customTextView:didSelectMenuAction:)]) {
        [self.menuActionDelegate customTextView:self didSelectMenuAction:currentAction];
    }
}

#pragma mark Helpers

- (void)showMenuController {
    UIMenuController *theMenu = [UIMenuController sharedMenuController];
    theMenu.menuItems = [self items];
    [theMenu update];

    CGRect selectionRect = CGRectMake (0, 0, self.contentSize.width, self.contentSize.height);
    [theMenu setTargetRect:selectionRect inView:self];
    [theMenu setMenuVisible:(theMenu.isMenuVisible) ? NO : YES animated:YES];
}

#pragma mark - Overridings

- (BOOL)canPerformAction:(SEL)action withSender:(id)sender {
    // Filter any action for this textView except our custom ones
    if (action == @selector(copyMenuItemPressed) || action == @selector(defineMenuItemPressed) || action == @selector(readMenuItemPressed)) {
        return YES;
    }
    return NO;
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *theTouch = [touches anyObject];

    if ([theTouch tapCount] == 1  && [self becomeFirstResponder]) {
        [self showMenuController];
    }
}


@end

实施

将你的 textView 的类设置为 EBCustomTextView 并符合 EBCustomTextViewMenuActionDelegate

界面

@interface ViewController () <EBCustomTextViewMenuActionDelegate>

viewDidLoad

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    self.textView.menuActionDelegate = self;
}

协议一致性

#pragma mark - Delegation

#pragma mark EBCustomTextViewMenuActionDelegate 

- (void)customTextView:(EBCustomTextView *)textView didSelectMenuAction:(EBCustomTextViewMenuAction)action {
    switch (action) {
        case EBCustomTextViewMenuActionCopy:
            NSLog(@"Copy Action");
            break;

        case EBCustomTextViewMenuActionRead:
            NSLog(@"Read Action");
            break;

        case EBCustomTextViewMenuActionDefine:
            NSLog(@"Define Action");
            break;

        default:
            break;
    }
}

输出

享受:)

Answer 2

你必须使用

[UITextView selectAll:self];

或（具有特定范围）

UITextView.selectedRange = NSMakeRange(0, 5);

或添加txtview.delegate = self;

- (BOOL)textViewShouldBeginEditing:(UITextView *)textView {
    dispatch_async(dispatch_get_main_queue(), ^{
        [textView selectAll:nil];  //nil or self as per needed
    });
    return YES;
}

Answer 3

使用 UILongPressGestureRecognizer 手势

#import "ViewController.h"

@interface ViewController ()<UIGestureRecognizerDelegate>
{
   UITextView * txtV;
   UILongPressGestureRecognizer * longPressGestureRecognizer;
}
@end

@implementation ViewController

- (void)viewDidLoad
{
   [super viewDidLoad];

   txtV=[[UITextView alloc]initWithFrame:CGRectMake(20, 50, 280, 300)];
   txtV.text = @"Jai Maharashtra";
   txtV.userInteractionEnabled=YES;
   txtV.selectable=NO;
   txtV.editable=NO;
   txtV.font= [UIFont italicSystemFontOfSize:[UIFont systemFontSize]];
   [self.view addSubview:txtV];

   longPressGestureRecognizer = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressGesture:)];
   longPressGestureRecognizer.delegate=self;
   [txtV addGestureRecognizer:longPressGestureRecognizer];
}

- (void)longPressGesture:(UILongPressGestureRecognizer *)gestureRecognizer
{
    if (gestureRecognizer.state == UIGestureRecognizerStateBegan)
    {
       txtV.selectable=YES;
       [txtV selectAll:self];
    }
}

-(BOOL)canPerformAction:(SEL)action withSender:(id)sender
{
    [txtV selectAll:self];

    if (action == @selector(cut:))
    {
       return YES;
    }
    if (action == @selector(selectAll:))
    {
      return YES;
    }
    if (action == @selector(copy:))
    {
      return YES;
    }
    if (action == @selector(delete:))
    {
      return YES;
    }

    txtV.selectable=NO;
    return YES;
 }

Answer 4

首先我开始为单元格中的每个UITextView 创建UILongPressGestureRecognizer 以识别长按。

在cellForRowAtIndexPath 中我只需添加该代码：

 UILongPressGestureRecognizer *recognizer1 = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(handleLongPressText1:)];
 messageRecognizer.delaysTouchesBegan = YES;

 UILongPressGestureRecognizer *recognizer2 = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(handleLongPressText2:)];
 translateRecognizer.delaysTouchesBegan = YES;


 [cell.backgroundViewText1 addGestureRecognizer:recognizer1];
 [cell.backgroundViewText2 addGestureRecognizer:recognizer2];

我使用两个不同的选择器，因为我需要知道从单元格中获取哪些文本。

方法之后：

    -(void)handleLongPressText1:(UILongPressGestureRecognizer *)gestureRecognizer
{
    if ([gestureRecognizer state] == UIGestureRecognizerStateBegan) {
        CGPoint p = [gestureRecognizer locationInView:self.tableView];
        NSIndexPath *indexPath = [self.tableView indexPathForRowAtPoint:p];
        if (indexPath == nil){
            NSLog(@"couldn't find index path");
        } else {
            [self becomeFirstResponder];

            UIMenuController *menuController = [UIMenuController sharedMenuController];
            UIMenuItem *resetMenuItem = [[UIMenuItem alloc] initWithTitle:@"Copy" action:@selector(copyMethod)];
            UIMenuItem *menuItem = [[UIMenuItem alloc] initWithTitle:@"Read" action:@selector(readButtonAction)];

            [menuController setMenuItems:[NSArray arrayWithObjects:resetMenuItem,menuItem, nil]];
            CGRect rect =gestureRecognizer.view.frame;
            NSLog(@"%@", NSStringFromCGRect(rect));
            [menuController setTargetRect:gestureRecognizer.view.frame inView:[[gestureRecognizer view] superview]];
            [menuController setMenuVisible:YES animated:YES];

        }
    }
}

    -(void)handleLongPressText2:(UILongPressGestureRecognizer *)gestureRecognizer
{
    if ([gestureRecognizer state] == UIGestureRecognizerStateBegan) {
        CGPoint p = [gestureRecognizer locationInView:self.tableView];
        NSIndexPath *indexPath = [self.tableView indexPathForRowAtPoint:p];
        if (indexPath == nil){
            NSLog(@"couldn't find index path");
        } else {
            [self becomeFirstResponder];

            UIMenuController *menuController = [UIMenuController sharedMenuController];
            UIMenuItem *resetMenuItem = [[UIMenuItem alloc] initWithTitle:@"Copy" action:@selector(copyMethod)];
            UIMenuItem *menuItem = [[UIMenuItem alloc] initWithTitle:@"Read" action:@selector(readButtonAction)];

            [menuController setMenuItems:[NSArray arrayWithObjects:resetMenuItem,menuItem, nil]];
            CGRect rect =gestureRecognizer.view.frame;
            NSLog(@"%@", NSStringFromCGRect(rect));
            [menuController setTargetRect:gestureRecognizer.view.frame inView:[[gestureRecognizer view] superview]];
            [menuController setMenuVisible:YES animated:YES];
        }
    }
}

要禁用UIMenuController 中的所有默认项，请使用上述代码

- (BOOL)canPerformAction:(SEL)iAction withSender:(id)iSender {
SEL copySelector = NSSelectorFromString(@"copyMethod");
SEL readSeletor = NSSelectorFromString(@"readButtonAction");

if (iAction == copySelector) {
    return YES;
}else if (iAction ==readSeletor){
    return YES;
}else{
    return NO;
}


return NO;
}