在iPhone开发中给键盘加个隐藏工具条

因为iPhone手机采用的触摸涉及,本身没有硬件键盘,一般都是点击输入框之后,弹出一个虚拟键盘出来,因此在iPhone开发中,经常在完成编辑输入之后,要写程序代码来关闭软键盘的输出,非常繁琐,当然关闭软键盘的方式有很多,比如放一个按钮在底层,通过点击屏幕的空白处来关闭键盘;也可以处理Return键盘事件来关闭键盘,这些暂且不说,本文要分享的是一个键盘顶部工具条的类,通过这个工具条,可以很方便的关闭键盘,而且有上一项,下一项的输入框切换,非常方便,效果请看下图:

在iPhone开发中给键盘加个隐藏工具条

 

类文件如下:
KeyBoardTopBar.h

//
//  KeyBoardTopBar.h
// 
//
//  Created by walkman on 10-12-2.
//  Copyright 2010 手机主题 http://www.shouji138.com  All rights reserved.
//

#import <Foundation/Foundation.h>


@interface KeyBoardTopBar : NSObject {
 UIToolbar *view;//工具条
 NSArray *TextFields;//输入框数组
 BOOL allowShowPreAndNext;//是否显示上一项下一项
 BOOL isInNavigationController;//是否在导航视图中
 UIBarButtonItem *prevButtonItem;//上一项按钮
 UIBarButtonItem *nextButtonItem;//下一项按钮
 UIBarButtonItem *hiddenButtonItem;//隐藏按钮
 UIBarButtonItem *spaceButtonItem;//空白按钮
 UITextField *currentTextField;//当前输入框
}
@property(nonatomic,retain) UIToolbar *view;

-(id)init; //初始化
-(void)setAllowShowPreAndNext:(BOOL)isShow; //设置是否显示上一项下一项
-(void)setIsInNavigationController:(BOOL)isbool; //设置是否在导航视图中
-(void)setTextFieldsArray:(NSArray *)array; //设置输入框数组
-(void)ShowPrevious; //显示上一项
-(void)ShowNext;     //显示下一项
-(void)ShowBar:(UITextField *)textField; //显示工具条
-(void)HiddenKeyBoard;  //隐藏键盘
@end

 

KeyBoardTopBar.m 文件

//
//  KeyBoardTopBar.m
//
//  Created by walkman on 10-12-2.
//  Copyright 2010 手机主题下载 http://www.shouji138.com  All rights reserved.
//

#import "KeyBoardTopBar.h"

@implementation KeyBoardTopBar
@synthesize view;

//初始化控件和变量
-(id)init{
 if(self = [super init]) {
  prevButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"上一项" style:UIBarButtonItemStyleBordered target:self action:@selector(ShowPrevious)];
  nextButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"下一项" style:UIBarButtonItemStyleBordered target:self action:@selector(ShowNext)];
  hiddenButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"隐藏键盘" style:UIBarButtonItemStyleBordered target:self action:@selector(HiddenKeyBoard)];
  spaceButtonItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem: UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
  view = [[UIToolbar alloc] initWithFrame:CGRectMake(0,480,320,44)];
  view.barStyle = UIBarStyleBlackTranslucent;
  view.items = [NSArray arrayWithObjects:prevButtonItem,nextButtonItem,spaceButtonItem,hiddenButtonItem,nil];
  allowShowPreAndNext = YES;
  TextFields = nil;
  isInNavigationController = YES;
  currentTextField = nil;
 }
 return self;
}
//设置是否在导航视图中
-(void)setIsInNavigationController:(BOOL)isbool{
 isInNavigationController = isbool;
}
//显示上一项
-(void)ShowPrevious{
 if (TextFields==nil) {
  return;
 }
 NSInteger num = -1;
 for (NSInteger i=0; i<[TextFields count]; i++) {
  if ([TextFields objectAtIndex:i]==currentTextField) {
   num = i;
   break;
  }
 }
 if (num>0){
  [[TextFields objectAtIndex:num] resignFirstResponder];
  [[TextFields objectAtIndex:num-1 ] becomeFirstResponder];
  [self ShowBar:[TextFields objectAtIndex:num-1]];
 }
}
//显示下一项
-(void)ShowNext{
 if (TextFields==nil) {
  return;
 }
 NSInteger num = -1;
 for (NSInteger i=0; i<[TextFields count]; i++) {
  if ([TextFields objectAtIndex:i]==currentTextField) {
   num = i;
   break;
  }
 }
 if (num<[TextFields count]-1){
  [[TextFields objectAtIndex:num] resignFirstResponder];
  [[TextFields objectAtIndex:num+1] becomeFirstResponder];
  [self ShowBar:[TextFields objectAtIndex:num+1]];
 }
}
//显示工具条
-(void)ShowBar:(UITextField *)textField{
 currentTextField = textField; 
 if (allowShowPreAndNext) {
  [view setItems:[NSArray arrayWithObjects:prevButtonItem,nextButtonItem,spaceButtonItem,hiddenButtonItem,nil]];
 }
 else {
  [view setItems:[NSArray arrayWithObjects:spaceButtonItem,hiddenButtonItem,nil]];
 }
 if (TextFields==nil) {
  prevButtonItem.enabled = NO;
  nextButtonItem.enabled = NO;
 }
 else {
  NSInteger num = -1;
  for (NSInteger i=0; i<[TextFields count]; i++) {
   if ([TextFields objectAtIndex:i]==currentTextField) {
    num = i;
    break;
   }
  }
  if (num>0) {
   prevButtonItem.enabled = YES;
  }
  else {
   prevButtonItem.enabled = NO;
  }
  if (num<[TextFields count]-1) {
   nextButtonItem.enabled = YES;
  }
  else {
   nextButtonItem.enabled = NO;
  }
 } 
 [UIView beginAnimations:nil context:nil];
 [UIView setAnimationDuration:0.3];
 if (isInNavigationController) {
  view.frame = CGRectMake(0, 201-40, 320, 44);
 }
 else {
  view.frame = CGRectMake(0, 201, 320, 44);
 } 
 [UIView commitAnimations]; 
}
//设置输入框数组
-(void)setTextFieldsArray:(NSArray *)array{
 TextFields = array;
}
//设置是否显示上一项和下一项按钮
-(void)setAllowShowPreAndNext:(BOOL)isShow{
 allowShowPreAndNext = isShow;
}

//隐藏键盘和工具条
-(void)HiddenKeyBoard{
 if (currentTextField!=nil) {
  [currentTextField  resignFirstResponder];
 }
 [UIView beginAnimations:nil context:nil];
 [UIView setAnimationDuration:0.3];
 view.frame = CGRectMake(0, 480, 320, 44);
 [UIView commitAnimations];
}
//释放
- (void)dealloc {
 [view release];
 [TextFields release];
 [prevButtonItem release];
 [nextButtonItem release];
 [hiddenButtonItem release];
 [currentTextField release];
 [spaceButtonItem release];
    [super dealloc];
}
@end


下面是使用这个类的代码:
在UIViewController头文件中申明,并定义,并且实现UITextFieldDelegate代理
比如:在keyboardtopbarViewController.h文件,我是这样写的
//
//  keyboardtopbarViewController.h
//  keyboardtopbar
//
//  Created by walkman on 10-12-2.
//  Copyright 2010 手机主题 http://www.shouji138.com  All rights reserved.
//

#import <UIKit/UIKit.h>
@class KeyBoardTopBar;
@interface keyboardtopbarViewController : UIViewController <UITableViewDelegate,UITableViewDataSource,UITextFieldDelegate> {
 UITableView *tableview;
 NSMutableArray *cellsTextArray;
 NSMutableArray *editFieldArray;
 
 UIButton *btnReg;
 KeyBoardTopBar *keyboardbar;
 CGRect rect;
}


在在UIViewController的m文件中,初始化,并添加到view中
- (void)viewDidLoad {
 [super viewDidLoad];
 ......
 //其中editFieldArray 是UITextField数组,在上面已经初始化,并添加了N个UITextField在里面。
 //具体的代码请下载附件查看,这里只贴出了相关的代码
 keyboardbar = [[KeyBoardTopBar alloc]init];
 [keyboardbar  setAllowShowPreAndNext:YES];
 [keyboardbar setIsInNavigationController:NO];
 [keyboardbar setTextFieldsArray:editFieldArray];
 [self.view addSubview:keyboardbar.view];
}

//这个方法是UITextFieldDelegate代理中的方法,表示输入框开始处于编辑状态。
- (void)textFieldDidBeginEditing:(UITextField *)textField{ 
 [keyboardbar ShowBar:textField];  //显示工具条 
 ......
}

OK了,调用起来还是很方便吧,当然,这个类还有需要完善的地方,比如,在执行了HiddenKeyBoard方法隐藏了键盘和工具条之后,如果在调用页面时候需要再做进一步处理,目前是无法实现的,等下一个版本中再加入一个Delegate类。
最后提供演示项目的下载:
http://www.shouji138.com/files/keyboardtopbar.zip
也欢迎光临作者的小站:手机主题 http://www.shouji138.com/
欢迎与作者交流:haolinks#163.com

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