iOS开发 键盘添加工具条(toolbar)

原文地址　　http://gaohaijun.blog.163.com/blog/static/17669827120119233349519/

IOS 开发中，iphone/ipad/itouch采用的触摸设计，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。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，效果如下图所示：

 

一、KeyBoardTopBar类文件

  1）KeyBoardTopBar.h头文件

 

　　

 1 #import <Foundation/Foundation.h>

 2 

 3 

 4 @interface KeyBoardTopBar : NSObject {

 5 

 6 UIToolbar       *view;                       //工具条        

 7 

 8 NSArray         *textFields;                 //输入框数组

 9 

10 BOOL            allowShowPreAndNext;         //是否显示上一项、下一项

11 

12 BOOL            isInNavigationController;    //是否在导航视图中

13 

14 UIBarButtonItem *prevButtonItem;             //上一项按钮

15 

16 UIBarButtonItem *nextButtonItem;             //下一项按钮

17 

18 UIBarButtonItem *hiddenButtonItem;           //隐藏按钮

19 

20 UIBarButtonItem *spaceButtonItem;            //空白按钮

21 

22 UITextField     *currentTextField;           //当前输入框

23 

24 }

25 

26 @property(nonatomic,retain) UIToolbar *view;

27 

28 

29 -(id)init; 

30 

31 -(void)setAllowShowPreAndNext:(BOOL)isShow;

32 

33 -(void)setIsInNavigationController:(BOOL)isbool;

34 

35 -(void)setTextFieldsArray:(NSArray *)array;

36 

37 -(void)showPrevious;

38 

39 -(void)showNext;

40 

41 -(void)showBar:(UITextField *)textField;

42 

43 -(void)HiddenKeyBoard;

44 

45 @end

 

  2）KeyBoardTopBar.m实现文件

 

  1 #import "KeyBoardTopBar.h"

  2 

  3 

  4 @implementation KeyBoardTopBar

  5 

  6 @synthesize view;

  7 

  8 

  9 //初始化控件和变量

 10 

 11 -(id)init{

 12 

 13 if((self = [super init])) {

 14 

 15 prevButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"上一项" style:UIBarButtonItemStyleBordered target:self action:@selector(ShowPrevious)];

 16 

 17 nextButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"下一项" style:UIBarButtonItemStyleBordered target:self action:@selector(ShowNext)];

 18 

 19 hiddenButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"隐藏键盘" style:UIBarButtonItemStyleBordered target:self action:@selector(HiddenKeyBoard)];

 20 

 21 spaceButtonItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem: UIBarButtonSystemItemFlexibleSpace target:nil action:nil];

 22 

 23 view = [[UIToolbar alloc] initWithFrame:CGRectMake(0,480,320,44)];

 24 

 25 view.barStyle = UIBarStyleBlackTranslucent;

 26 

 27 view.items = [NSArray arrayWithObjects:prevButtonItem,nextButtonItem,spaceButtonItem,hiddenButtonItem,nil];

 28 

 29 allowShowPreAndNext = YES;

 30 

 31 textFields = nil;

 32 

 33 isInNavigationController = YES;

 34 

 35 currentTextField = nil;

 36 

 37 }

 38 

 39 return self;

 40 

 41 }

 42 

 43 //设置是否在导航视图中

 44 

 45 -(void)setIsInNavigationController:(BOOL)isbool{

 46 

 47 isInNavigationController = isbool;

 48 

 49 }

 50 

 51 //显示上一项

 52 

 53 -(void)showPrevious{

 54 

 55 if (textFields==nil) {

 56 

 57 return;

 58 

 59 }

 60 

 61 NSInteger num = -1;

 62 

 63 for (NSInteger i=0; i<[textFields count]; i++) {

 64 

 65 if ([textFields objectAtIndex:i]==currentTextField) {

 66 

 67 num = i;

 68 

 69 break;

 70 

 71 }

 72 

 73 }

 74 

 75 if (num>0){

 76 

 77 [[textFields objectAtIndex:num] resignFirstResponder];

 78 

 79 [[textFields objectAtIndex:num-1 ] becomeFirstResponder];

 80 

 81 [self showBar:[textFields objectAtIndex:num-1]];

 82 

 83 }

 84 

 85 }

 86 

 87 //显示下一项

 88 

 89 -(void)showNext{

 90 

 91 if (textFields==nil) {

 92 

 93 return;

 94 

 95 }

 96 

 97 NSInteger num = -1;

 98 

 99 for (NSInteger i=0; i<[textFields count]; i++) {

100 

101 if ([textFields objectAtIndex:i]==currentTextField) {

102 

103 num = i;

104 

105 break;

106 

107 }

108 

109 }

110 

111 if (num<[textFields count]-1){

112 

113 [[textFields objectAtIndex:num] resignFirstResponder];

114 

115 [[textFields objectAtIndex:num+1] becomeFirstResponder];

116 

117 [self showBar:[textFields objectAtIndex:num+1]];

118 

119 }

120 

121 }

122 

123 //显示工具条

124 

125 -(void)showBar:(UITextField *)textField{

126 

127 currentTextField = textField;

128 

129 if (allowShowPreAndNext) {

130 

131 [view setItems:[NSArray arrayWithObjects:prevButtonItem,nextButtonItem,spaceButtonItem,hiddenButtonItem,nil]];

132 

133 }

134 

135 else {

136 

137 [view setItems:[NSArray arrayWithObjects:spaceButtonItem,hiddenButtonItem,nil]];

138 

139 }

140 

141 if (textFields==nil) {

142 

143 prevButtonItem.enabled = NO;

144 

145 nextButtonItem.enabled = NO;

146 

147 }

148 

149 else {

150 

151 NSInteger num = -1;

152 

153 for (NSInteger i=0; i<[textFields count]; i++) {

154 

155 if ([textFields objectAtIndex:i]==currentTextField) {

156 

157 num = i;

158 

159 break;

160 

161 }

162 

163 }

164 

165 if (num>0) {

166 

167 prevButtonItem.enabled = YES;

168 

169 }

170 

171 else {

172 

173 prevButtonItem.enabled = NO;

174 

175 }

176 

177 if (num<[textFields count]-1) {

178 

179 nextButtonItem.enabled = YES;

180 

181 }

182 

183 else {

184 

185 nextButtonItem.enabled = NO;

186 

187 }

188 

189 }

190 

191 [UIView beginAnimations:nil context:nil];

192 

193 [UIView setAnimationDuration:0.3];

194 

195 if (isInNavigationController) {

196 

197 view.frame = CGRectMake(0, 201-40, 320, 44);

198 

199 }

200 

201 else {

202 

203 view.frame = CGRectMake(0, 201, 320, 44);

204 

205 }

206 

207 [UIView commitAnimations];

208 

209 }

210 

211 //设置输入框数组

212 

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

214 

215 textFields = array;

216 

217 }

218 

219 //设置是否显示上一项和下一项按钮

220 

221 -(void)setAllowShowPreAndNext:(BOOL)isShow{

222 

223 allowShowPreAndNext = isShow;

224 

225 }

226 

227 //隐藏键盘和工具条

228 

229 -(void)HiddenKeyBoard{

230 

231 if (currentTextField!=nil) {

232 

233 [currentTextField  resignFirstResponder];

234 

235 }

236 

237 [UIView beginAnimations:nil context:nil];

238 

239 [UIView setAnimationDuration:0.3];

240 

241 view.frame = CGRectMake(0, 480, 320, 44);

242 

243 [UIView commitAnimations];

244 

245 }

246 

247 - (void)dealloc {

248 

249 [view release];

250 

251 [textFields release];

252 

253 [prevButtonItem release];

254 

255 [nextButtonItem release];

256 

257 [hiddenButtonItem release];

258 

259 [currentTextField release];

260 

261 [spaceButtonItem release];

262 

263     [super dealloc];

264 

265 }

266 

267 @end

 

 

二、如何使用

   1）在用到输入的controller类.h头文件中，首先引入导入KeyBoardTopBar：

 

 

 

#import "KeyBoardTopBar.h"

 

NSMutableArray *editFieldArray;     //存放视图中可编辑的控件

 

KeyBoardTopBar *keyboardbar;

 

 

 

   2）在用到输入的controller类.m实现文件中，首先初始化KeyBoardTopBar类的实例，如下：

 

 

 

        keyboardbar = [[KeyBoardTopBar alloc]init];

 

[keyboardbar  setAllowShowPreAndNext:YES];

 

[keyboardbar setIsInNavigationController:NO];

 

[keyboardbar setTextFieldsArray:editFieldArray];

 

[self.view addSubview:keyboardbar.view];

  3）在用到输入的controller类.m实现文件中，在此以UITextField为例说明，在它的回调方法中，实现如下：

 

 

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

 

[keyboardbar showBar:textField];//KeyBoardTopBar的实例对象调用显示键盘方法

 

}

 

 

 

三、总结

 

  上述的基本原理就是在键盘的上方，加一个透明状的工具条；当然不需要专门定义类，也可以的，可以直接在

 

需要调用键盘的地方加入工具条，让你的工具条随着键盘的出现而出现，消失而消失！

 

 

 

  大道至简，有更好的方法，希望一起讨论交流，谢谢！