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因為iPhone手機采用的觸摸涉及，本身沒有硬件鍵盤，一般都是點擊輸入框之后，彈出一個虛擬鍵盤出來，因此在iPhone開發中，經常在完成編輯輸入之后，要寫程序代碼來關閉軟鍵盤的輸出，非常繁瑣，當然關閉軟鍵盤的方式有很多，比如放一個按鈕在底層，通過點擊屏幕的空白處來關閉鍵盤;也可以處理Return鍵盤事件來關閉鍵盤，這些暫且不說，本文要分享的是一個鍵盤頂部工具條的類，通過這個工具條，可以很方便的關閉鍵盤，而且有上一項，下一項的輸入框切換，非常方便，效果請看下圖：

類文件如下：

KeyBoardTopBar.h

//

// KeyBoardTopBar.h

//

//

// Created by walkman on 10-12-2.

// Copyright 2010 手機主題 http://www.shouji138.com All rights reserved.

//

#import

@interface KeyBoardTopBar : NSObject {

UIToolbar *view;//工具條

NSArray *TextFields;//輸入框數組

BOOL allowShowPreAndNext;//是否顯示上一項下一項

BOOL isInNavigationController;//是否在導航視圖中

UIBarButtonItem *prevButtonItem;//上一項按鈕

UIBarButtonItem *nextButtonItem;//下一項按鈕

UIBarButtonItem *hiddenButtonItem;//隱藏按鈕

UIBarButtonItem *spaceButtonItem;//空白按鈕

UITextField *currentTextField;//當前輸入框

}

@property(nonatomic,retain) UIToolbar *view;

-(id)init; //初始化

-(void)setAllowShowPreAndNext:(BOOL)isShow; //設置是否顯示上一項下一項

-(void)setIsInNavigationController:(BOOL)isbool; //設置是否在導航視圖中

-(void)setTextFieldsArray:(NSArray *)array; //設置輸入框數組

-(void)ShowPrevious; //顯示上一項

-(void)ShowNext; //顯示下一項

-(void)ShowBar:(UITextField *)textField; //顯示工具條

-(void)HiddenKeyBoard; //隱藏鍵盤

@end

KeyBoardTopBar.m 文件

//

// KeyBoardTopBar.m

//

// Created by walkman on 10-12-2.

// Copyright 2010 手機主題下載 http://www.shouji138.com All rights reserved.

//

#import "KeyBoardTopBar.h"

@implementation KeyBoardTopBar

@synthesize view;

//初始化控件和變量

-(id)init{

if(self = [super init]) {

prevButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"上一項" style:UIBarButtonItemStyleBordered target:self action:@selector(ShowPrevious)];

nextButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"下一項" style:UIBarButtonItemStyleBordered target:self action:@selector(ShowNext)];

hiddenButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"隱藏鍵盤" 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;

}

//設置是否在導航視圖中

-(void)setIsInNavigationController:(BOOL)isbool{

isInNavigationController = isbool;

}

//顯示上一項

-(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]];

}

}

//顯示下一項

-(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]];

}

}

//顯示工具條

-(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];

}

//設置輸入框數組

-(void)setTextFieldsArray:(NSArray *)array{

TextFields = array;

}

//設置是否顯示上一項和下一項按鈕

-(void)setAllowShowPreAndNext:(BOOL)isShow{

allowShowPreAndNext = isShow;

}

//隱藏鍵盤和工具條

-(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];

}

//釋放

- (void)dealloc {

[view release];

[TextFields release];

[prevButtonItem release];

[nextButtonItem release];

[hiddenButtonItem release];

[currentTextField release];

[spaceButtonItem release];

[super dealloc];

}

@end

下面是使用這個類的代碼：

在UIViewController頭文件中申明，并定義，并且實現UITextFieldDelegate代理

比如：在keyboardtopbarViewController.h文件，我是這樣寫的

//

// keyboardtopbarViewController.h

// keyboardtopbar

//

// Created by walkman on 10-12-2.

// Copyright 2010 手機主題 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數組，在上面已經初始化，并添加了N個UITextField在里面。

//具體的代碼請下載附件查看，這里只貼出了相關的代碼

keyboardbar = [[KeyBoardTopBar alloc]init];

[keyboardbar setAllowShowPreAndNext:YES];

[keyboardbar setIsInNavigationController:NO];

[keyboardbar setTextFieldsArray:editFieldArray];

[self.view addSubview:keyboardbar.view];

}

//這個方法是UITextFieldDelegate代理中的方法，表示輸入框開始處于編輯狀態。

- (void)textFieldDidBeginEditing:(UITextField *)textField{

[keyboardbar ShowBar:textField]; //顯示工具條

......

}

OK了，調用起來還是很方便吧，當然，這個類還有需要完善的地方，比如，在執行了HiddenKeyBoard方法隱藏了鍵盤和工具條之后，如果在調用頁面時候需要再做進一步處理，目前是無法實現的，等下一個版本中再加入一個Delegate類。

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