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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：

名單

類文件如下：

keyboardtopbar.h

//

// keyboardtopbar.h

//

//

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

// copyright 2010 手機主題 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 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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