UITextView的使用详解

//初始化并定义大小   

 UITextView *textview = [[UITextView allocinitWithFrame:CGRectMake(201028030)];

    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(00320,30)];

    [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];

}

posted @ 2015-06-23 14:51  Allen.Ma  阅读(148)  评论(0编辑  收藏  举报