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：

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

@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

@class KeyBoardTopBar;

@interface keyboardtopbarViewController : UIViewController {

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。

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