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在iOS应用中，实现复制和粘贴文本的功能相对简单。可以通过UIPasteboard类来处理剪贴板中的数据。以下是一个使用Objective-C实现复制和粘贴文本的完整示例。

创建简单的用户界面

我们将创建一个ViewController，包含一个文本框和两个按钮：一个用于复制文本，另一个用于粘贴文本。

ViewController.h

#import 
   
    
@interface ViewController : UIViewController
@property (nonatomic, strong) UITextField *inputTextField;
@property (nonatomic, strong) UIButton *copyButton;
@property (nonatomic, strong) UIButton *pasteButton;
@end
   

ViewController.m

#import "ViewController.h"
#import 
   
    
@interface ViewController ()
@property (nonatomic, strong) UITextField *inputTextField;
@property (nonatomic, strong) UIButton *copyButton;
@property (nonatomic, strong) UIButton *pasteButton;
@end
@implementation ViewController
- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.inputTextField = [[UITextField alloc] initWithFrame:CGRectMake(20, 50, 240, 30)];
    self.inputTextField.borderStyle = UITextFieldBorderStyleRoundedRect;
    self.inputTextField.placeholder = @"输入文本";
    [self.view addSubview:self.inputTextField];
    
    self.copyButton = [[UIButton alloc] initWithFrame:CGRectMake(20, 100, 120, 30)];
    [self.copyButton setTitle:@"复制" forState:UIControlStateNormal];
    [self.copyButton addTarget:self action:@selector(copyText:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:self.copyButton];
    
    self.pasteButton = [[UIButton alloc] initWithFrame:CGRectMake(160, 100, 120, 30)];
    [self.pasteButton setTitle:@"粘贴" forState:UIControlStateNormal];
    [self.pasteButton addTarget:self action:@selector(pasteText:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:self.pasteButton];
}
- (void)copyText:(id)sender {
    NSString *text = self.inputTextField.text;
    [UIPasteboard.generalPasteboard.writeText:text];
    NSLog(@"复制了文本：%@", text);
}
- (void)pasteText:(id)sender {
    NSString *text = [UIPasteboard.generalPasteboard.readText];
    if (text) {
        self.inputTextField.text = text;
        NSLog(@"粘贴了文本：%@", text);
    }
}
- (void)touchesBegan:(NSSet *)touches inEvent:(UIEvent *)event {
    [self.inputTextField resignFirstResponder];
}
@end
   

代码解释

通过以上代码，您可以轻松地在iOS应用中实现文本的复制和粘贴功能。