给数字键盘加上Done按键

默认的数字键盘没有Done按键，如下图：

 

KeyboardViewController.h

 

#import <UIKit/UIKit.h>

@interface KeyboardViewController: UIViewController {
    UITextField *textField;
}

@end

 

KeyboardViewController.m

 

#import "KeyboardViewController.h"

@implementation KeyboardViewController

- (void)loadView {
    self.view = [[UIView alloc] initWithFrame:[UIScreen mainScreen].applicationFrame];
    self.view.backgroundColor = [UIColor groupTableViewBackgroundColor];
    
    textField = [[UITextField alloc] initWithFrame:CGRectMake(10, 200, 300, 26)];
    textField.borderStyle = UITextBorderStyleRoundedRect;
    textField.keyboardType = UIKeyboardTypeNumberPad;
    textField.returnKeyType = UIReturnKeyDone;
    textField.textAlignment = UITextAlignmentLeft;
    textField.text = @"12345";
    
    [self.view addSubview:textField];
    
    [textField release];
    
    [[NSNotificationCenter defaultCenter] addObserver:self 
                                             selector:@selector(keyboardWillShow:) 
                                                 name:UIKeyboardDidShowNotification
                                               object:nil];
}

- (void)keyboardWillShow:(NSNotification *)note {  
    UIButton *doneButton = [UIButton buttonWithType:UIButtonTypeCustom];
    doneButton.frame = CGRectMake(0, 163, 106, 53);
    doneButton.adjustsImageWhenHighlighted = NO;
    [doneButton setImage:[UIImage imageNamed:@"DoneUp.png"] forState:UIControlStateNormal];
    [doneButton setImage:[UIImage imageNamed:@"DoneDown.png"] forState:UIControlStateHighlighted];
    [doneButton addTarget:self action:@selector(doneButton:) forControlEvents:UIControlEventTouchUpInside];
    
    UIWindow *tempWindow = [[[UIApplication sharedApplication] windows] objectAtIndex:1];
    UIView *keyboard;
    for(int i = 0; i < [tempWindow.subviews count]; i++) {
        keyboard = [tempWindow.subviews objectAtIndex:i];
		if(([[keyboard description] hasPrefix:@"<UIPeripheralHostView"] == YES) || ([[keyboard description] hasPrefix:@"<UIKeyboard"] == YES))
            [keyboard addSubview:doneButton];
    }
}

- (void)doneButton:(id)sender {
    [textField resignFirstResponder];
}

- (void)dealloc {
    [[NSNotificationCenter defaultCenter] removeObserver:self];
    [textField release];
    [super dealloc];
}

@end

 

效果图：