UITextView的用法及技巧

一、新建一个textView

01 //初始化
02 UITextView *textView = [[[UITextView alloc] init] autorelease];
03
04 //设置代理 需在interface中声明UITextViewDelegate
05 textView.delegate = self;
06
07 //字体大小
08 textView.font = [UIFont systemFontOfSize:16];
09
10 //添加滚动区域
11 textView.contentInset = UIEdgeInsetsMake(-11, -6, 0, 0);
12
13 //是否可以滚动
14 textView.scrollEnabled = NO;
15
16 //获得焦点
17 [textView becomeFirstResponder];

1 [self.view addSubview:textView];

二、键盘操作

1 //返回键的类型
2 textView.returnKeyType = UIReturnKeyDefault;
3
4 //键盘类型
5 textView.keyboardType = UIKeyboardTypeDefault;

三、隐藏键盘的几种方式

个人还是认为最方便的是在键盘上加上一个ToolBar，在上面加上一个按钮来隐藏键盘

①在键盘上加上隐藏按钮

01 //定义一个toolBar
02 UIToolbar * topView = [[UIToolbar alloc]initWithFrame:CGRectMake(0, 0, 320, 30)];
03
04 //设置style
05 [topView setBarStyle:UIBarStyleBlack];
06
07 //定义两个flexibleSpace的button，放在toolBar上，这样完成按钮就会在最右边
08 UIBarButtonItem * button1 =[[UIBarButtonItem  alloc]initWithBarButtonSystemItem:                                        UIBarButtonSystemItemFlexibleSpace target:self action:nil];
09
10 UIBarButtonItem * button2 = [[UIBarButtonItem  alloc]initWithBarButtonSystemItem:                                        UIBarButtonSystemItemFlexibleSpace target:self action:nil];
11
12 //定义完成按钮
13 UIBarButtonItem * doneButton = [[UIBarButtonItem alloc]initWithTitle:@"完成" style:UIBarButtonItemStyleDone  target:self action:@selector(resignKeyboard)];
14
15 //在toolBar上加上这些按钮
16 NSArray * buttonsArray = [NSArray arrayWithObjects:button1,button2,doneButton,nil];
17 [topView setItems:buttonsArray];
18
19 [textView setInputAccessoryView:topView];

1 //隐藏键盘
2 - (void)resignKeyboard {
3     [textView resignFirstResponder];
4 }

最终效果

还有几种也可隐藏键盘的方式

②用回车键，前提是你的textView中不需要用到回车键

1 -(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text {
2  if ([text isEqualToString:@"\n"])
3 {
4 [textView resignFirstResponder]; return NO;
5 }
6  return YES;
7 }

③触摸空白处隐藏键盘

1 -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
2 {
3     //隐藏键盘
4     [textView resignFirstResponder];
5 }

四、使键盘不挡住输入框

    在view中添加一个子view，设置此子view的tag值为1000，在此view上添加一个textView和一个发送按钮，如下图；我们要达到textView的键盘弹出时，整个View往上平移，键盘消失，view往下平移的效果，模拟发送短信的界面。

设置textView圆角

1 //设置textView圆角
2 [self.textView.layer setCornerRadius:10];

①、在viewWillAppear中添加键盘监听事件

1 //添加键盘的监听事件
2
3     //注册通知,监听键盘弹出事件
4     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidShow:) name:UIKeyboardDidShowNotification object:nil];
5
6     //注册通知,监听键盘消失事件
7     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidHidden) name:UIKeyboardDidHideNotification object:nil];

②、完成①selector中键盘弹出keyboardDidShow:和消失keyboardDidHidden方法

    在.m文件#import后面添加

1 //动画时间
2 #define kAnimationDuration 0.2
3 //view高度
4 #define kViewHeight 56

键盘出现

01 // 键盘弹出时
02 -(void)keyboardDidShow:(NSNotification *)notification
03 {
04
05     //获取键盘高度
06     NSValue *keyboardObject = [[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey];
07
08     CGRect keyboardRect;
09
10     [keyboardObject getValue:&keyboardRect];
11
12     //调整放置有textView的view的位置
13
14        //设置动画
15     [UIView beginAnimations:nil context:nil];
16
17        //定义动画时间
18     [UIView setAnimationDuration:kAnimationDuration];
19
20        //设置view的frame，往上平移
21     [(UIView *)[self.view viewWithTag:1000] setFrame:CGRectMake(0, self.view.frame.size.height-keyboardRect.size.height-kViewHeight, 320, kViewHeight)];
22
23     [UIView commitAnimations];
24
25 }

键盘消失

01 //键盘消失时
02 -(void)keyboardDidHidden
03 {
04     //定义动画
05     [UIView beginAnimations:nil context:nil];
06     [UIView setAnimationDuration:kAnimationDuration];
07     //设置view的frame，往下平移
08     [(UIView *)[self.view viewWithTag:1000] setFrame:CGRectMake(0, self.view.frame.size.height-kViewHeight, 320, kViewHeight)];
09     [UIView commitAnimations];
10 }

效果图：