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//初始化并定义大小???
?UITextView?*textview = [[UITextView?alloc]?initWithFrame:CGRectMake(20,?10,?280,?30)];
????textview.backgroundColor=[UIColor?whiteColor];?//背景色
????textview.scrollEnabled?=?NO;????//当文字超过视图的边框时是否允许滑动，默认为“YES”
????textview.editable?=?YES;????????//是否允许编辑内容，默认为“YES”
????textview.delegate?=?self; ??????//设置代理方法的实现类
????textview.font=[UIFont?fontWithName:@"Arial"?size:18.0];?//设置字体名字和字体大小;
????textview.returnKeyType?=?UIReturnKeyDefault;//return键的类型
????textview.keyboardType?=?UIKeyboardTypeDefault;//键盘类型
????textview.textAlignment?=?NSTextAlignmentLeft;?//文本显示的位置默认为居左
????textview.dataDetectorTypes?=?UIDataDetectorTypeAll;?//显示数据类型的连接模式（如电话号码、网址、地址等）
????textview.textColor?= [UIColor?blackColor];
????textview.text?=?@"UITextView详解";//设置显示的文本内容
????[self.view?addSubview:textview];
?
UITextView的代理方法如下:
//将要开始编辑
- (BOOL)textViewShouldBeginEditing:(UITextView?*)textView;
?
//将要结束编辑
- (BOOL)textViewShouldEndEditing:(UITextView?*)textView;
?
//开始编辑
- (void)textViewDidBeginEditing:(UITextView?*)textView;
?
//结束编辑
- (void)textViewDidEndEditing:(UITextView?*)textView;
?
//内容将要发生改变编辑
- (BOOL)textView:(UITextView?*)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString?*)text;
?
//内容发生改变编辑
- (void)textViewDidChange:(UITextView?*)textView;
?
//焦点发生改变
- (void)textViewDidChangeSelection:(UITextView?*)textView;
?
有时候我们要控件自适应输入的文本的内容的高度，只要在textViewDidChange的代理方法中加入调整控件大小的代理即可
?
?
- (void)textViewDidChange:(UITextView?*)textView{
????//计算文本的高度
????CGSize?constraintSize;
????constraintSize.width?= textView.frame.size.width-16;
????constraintSize.height?=?MAXFLOAT;
????CGSize?sizeFrame =[textView.text?sizeWithFont:textView.font
????????????????????????????????constrainedToSize:constraintSize
????????????????????????????????????lineBreakMode:UILineBreakModeWordWrap];
????
?//重新调整textView的高度
????textView.frame?=CGRectMake(textView.frame.origin.x,textView.frame.origin.y,textView.frame.size.width,sizeFrame.height+5);
}
?
?
控制输入文字的长度和内容，可通调用以下代理方法实现
- (BOOL)textView:(UITextView?*)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString?*)text
{
????if?(range.location>=100)
????{
????????//控制输入文本的长度
????????return??NO;
????}
????if?([text?isEqualToString:@"\n"]) {
????????//禁止输入换行
????????return?NO;
????}
????else
????{
????????return?YES;
????}
}
?
?
UITextView退出键盘的几种方式
因为iphone的软键盘没有自带的退键盘键，所以要实现退出键盘需要自己实现，有如下几种方式：
1）如果你程序是有导航条的，可以在导航条上面加多一个Done的按钮，用来退出键盘，当然要先实UITextViewDelegate。
?
- (void)textViewDidBeginEditing:(UITextView?*)textView {
????
????UIBarButtonItem?*done =????[[UIBarButtonItem?alloc]?initWithBarButtonSystemItem:UIBarButtonSystemItemDone
?????????????????????????????????????????????????????????????????????????????target:self
?????????????????????????????????????????????????????????????????????????????action:@selector(dismissKeyBoard)];
????
????self.navigationItem.rightBarButtonItem?= done;
????
????[done?release];
????done =?nil;
????
}
?
- (void)textViewDidEndEditing:(UITextView?*)textView {??
????self.navigationItem.rightBarButtonItem?=?nil;???
}
?
- (void)dismissKeyBoard {???
????[self.textView resignFirstResponder];??
}
?
?
2）如果你的textview里不用回车键，可以把回车键当做退出键盘的响应键。
代码如下：
-(BOOL)textView:(UITextView?*)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString?*)text
{
????if?([text?isEqualToString:@"\n"]) {
????????[textView?resignFirstResponder];
????????return?NO;
????}
????return YES;
}
?
?
?
?
3）还有你也可以自定义其他加载键盘上面用来退出，比如在弹出的键盘上面加一个view来放置退出键盘的Done按钮。
代码如下：
?
????UIToolbar?* topView = [[UIToolbar?alloc]initWithFrame:CGRectMake(0,?0,?320,30)];
????[topView?setBarStyle:UIBarStyleBlack];
?
????UIBarButtonItem?*btnSpace = [[UIBarButtonItem?alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace
?????????????????????????????????????????????????????????????????????????????target:self
?????????????????????????????????????????????????????????????????????????????action:nil];
????
????UIBarButtonItem?*doneButton = [[UIBarButtonItem?alloc]initWithTitle:@"Done"
?????????????????????????????????????????????????????????????????style:UIBarButtonItemStyleDone
?????????????????????????????????????????????????????????????????target:self
????????????????????????????????????????????????????????????????action:@selector(dismissKeyBoard)];
????
????NSArray?* buttonsArray =?@[btnSpace, doneButton];;
????[doneButton?release];
????[btnSpace?release];
????[topView?setItems:buttonsArray];
????[textView setInputAccessoryView:topView];//当文本输入框加上topView
????[topView?release];
????topView =?nil;
?
-(IBAction)dismissKeyBoard
{
????[tvTextView resignFirstResponder];
}
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原文地址：http://www.cnblogs.com/allen123/p/4595462.html
