Question

I am running Objective-C/Cocoa in Shell in Windows, not on Mac OS X.

I want to append a string with an existing string in a text field when I click a button. I’ve created a button in a window, but I don’t know how to append a string when I click that button.

How can I append a string to a text field when that button is clicked?

Answer 1

import <UIKit/UiKit.h>
@interface MyViewController : UIViewController {
    UIButton *btnToAppend;
    UITextField *textfield;
}

- (IBAction)buttonClick:(id)sender;

@end

import "MyViewController.h"

@implementation MyViewController

-(void)init{
    btnToAppend = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    btbToAppend.frame = CGRectMake(10, 10, 100, 30);
    [btnToAppend setText:@"Append Text" forState:UIControlStateNormal];
    [btnToAppend addTarget:self action:@select(buttonClick:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubView:btnToAppend];
    textfield = [[UITextField alloc] initWithFrame:CGRectMake(10, 200, 300, 50)];
    textfield.borderStyle = UITextBorderStyleRoundedRect;
    [self.view addSubView:textfield];
}

-(IBAction)buttonClick:(id)sender {
    NSString *string = [textfield.text stringByAppendingString:@"Welcome "];
    textfield.text = string;
}

- (void)dealloc {
    [super dealloc];
}

@end

Output will be like :

Welcome Welcome Welcome …