UITextView

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原创最新推荐文章于 2026-03-17 11:12:21 发布 904 阅读 AI 写同款· GEO 优化 ›

iOS UIAlertController嵌入UITextView 1.Controller继承UITextViewDelegate 2.先创建一个UITextView UITextView *textView = [[UITextView alloc] init]; textView.layer.borderColor = [[UIColor lightGrayColor] CGColor]; textView.layer.borderWidth = 1.0f;... 阅读详情

self.textView = [[[UITextView alloc] initWithFrame:self.view.frame] autorelease]; //初始化大小并自动释放
2
3 self.textView.textColor = [UIColor blackColor];//设置textview里面的字体颜色
4
5 self.textView.font = [UIFont fontWithName:@"Arial" size:18.0];//设置字体名字和字体大小
6
7 self.textView.delegate = self;//设置它的委托方法
8
9 self.textView.backgroundColor = [UIColor whiteColor];//设置它的背景颜色
10
11 self.textView.text = @"Now is the time for all good developers to come to serve their country.\n\nNow is the time for all good developers to come to serve their country.";//设置它显示的内容
12
13 self.textView.returnKeyType = UIReturnKeyDefault;//返回键的类型
14
15 self.textView.keyboardType = UIKeyboardTypeDefault;//键盘类型
16
17 self.textView.scrollEnabled = YES;//是否可以拖动
18
19 self.textView.autoresizingMask = UIViewAutoresizingFlexibleHeight;//自适应高度
20
把键盘的回车键当初键盘弹回按钮
pragma mark - UITextView Delegate Methods

-(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{

if ([text isEqualToString:@"\n"]) {

[textView resignFirstResponder];

return NO;

}

return YES;

}
对textView字数限制
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
    if (range.location>=100)
    {
        return NO;
    }
    else
    {
        return YES;
    }

}

2. UITextView退出键盘的几种方式

因为你点击UITextView会出现键盘，如果你退出键盘，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。

代码如下：

 
    - (void)textViewDidBeginEditing:(UITextView *)textView {  
 
       UIBarButtonItem *done =    [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(leaveEditMode)] autorelease];  
 
       self.navigationItem.rightBarButtonItem = done;      
 
    }
 
    - (void)textViewDidEndEditing:(UITextView *)textView {  
 
        self.navigationItem.rightBarButtonItem = nil;  
 
    }
 
    - (void)leaveEditMode {  
 
        [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：

 
    #pragma mark - UITextView Delegate Methods   
 
    -(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text  
 
    {  
 
            if ([text isEqualToString:@"\n"]) {  
 
                [textView resignFirstResponder];  
 
                return NO;  
 
            }  
 
            return YES;  
 
        }

这样无论你是使用电脑键盘上的回车键还是使用弹出键盘里的return键都可以达到退出键盘的效果。

（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 * helloButton = [[UIBarButtonItem alloc]initWithTitle:@"Hello" style:UIBarButtonItemStyleBordered target:self action:nil];        
 
            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 = [NSArray arrayWithObjects:helloButton,btnSpace,doneButton,nil];  
 
            [doneButton release];  
 
            [btnSpace release];  
 
            [helloButton release];  
 
            [topView setItems:buttonsArray];  
 
            [tvTextView setInputAccessoryView:topView];  
 
        -(IBAction)dismissKeyBoard  
 
        {  
 
            [tvTextView resignFirstResponder];  
 
        }

（4）设置UITextView圆角问题

做法是在 #import QuartzCore/QuartzCore.h 后，便能調用 [textView.layer setCornerRadius:10]; 來把 UITextView 设定圓角

（5）UITextView根据文本大小自适应高度

通过实现文本字数来确定高度，如下：

NSString * desc =

@"Description it is  a test font, and don't become angry for which i use to do here.Now here is a very nice party from american or not!"

;

CGSize  size = [desc sizeWithFont:[UIFont systemFontOfSize:14] constrainedToSize:CGSizeMake(240, 2000) lineBreakMode:UILineBreakModeWordWrap];

然后需要定义UITextView的numberoflines为0，即不做行数的限制。如下：

 
    [textView setNumberOfLines:0];  
 
        [textView setFrame:CGRectMake(40, 135, 240, size.height+10)];  
 
        [textView setText:desc];

（6）UITextView自定选择文字后的菜单

在ViewDidLoad中加入：

 
    UIMenuItem *menuItem = [[UIMenuItem alloc]initWithTitle:@"分享到新浪微博" action:@selector(changeColor:)];
 
    UIMenuController *menu = [UIMenuController sharedMenuController];
 
    [menu setMenuItems:[NSArray arrayWithObject:menuItem]];
 
    [menuItem release];

当然上面那个@selector里面的changeColor方法还是自己写吧，也就是说点击了我们自定义的菜单项后会触发的方法。

然后还得在代码里加上一个方法：

 
    -(BOOL)canPerformAction:(SEL)action withSender:(id)sender
 
    {
 
    if(action == @selector(changeColor:))
 
    {
 
    if(textView.selectedRange.length>0)
 
    return YES;
 
    }
 
    return NO;
 
    }

实现后如下图：

一、给UITextView绘制圆角，通过QuartzCore框架，操作CALayer可以给UITextView绘制圆角边框。
       textView.layer.cornerRadius = 6
       textView.layer.masksToBounds = YES
通过cornerRadius可设置圆角弧度。
 
二、UITextView和UIImageView组合，将背景图片制作好加载进UIImageView。
      CGRect imageViewFrame = CGRectMake(30.0,100.0,240.0,90.0);
      UIImageView *imageView = [[UIImageView alloc] initWithFrame:imageViewFrame];
      imageView.image = [UIImage imageNamed:@"background.png"];
      imageView.userInteractionEnabled = YES;
      CGRect textViewFrame = CGRectMake(5.0,5.0,230.0,80.0);
      UITextView *textView = [[UITextView alloc] initWithFrame:textViewFrame];
      textView.backgroundColor = [UIColor clearColor];
      [imageView addSubview:textView];
设置imageView.userInteractionEnabled = YES,让textView响应触碰事件。
 
三、设置UITextView背景图片，在UITextView区域内。
      CGRect textViewFrame = CGRectMake(30.0,100.0,240.0,90.0);
      UITextView *textView = [[UITextView alloc] initWithFrame:textViewFrame];      
      UIImageView *imageView = [[UIImageView alloc] initWithFrame:[textView bounds]];
      imageView.image = [UIImage imageNamed:@"background.png"];
      [textView addSubview:imageView];
      [textView sendSubviewToBack:imageView];