1.创建并初始化
创建UITextView的文件,并在.h文件中写入如下代码:
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#import
<UIKit/UIKit.h> @interface
TextViewController : UIViewController <UITextViewDelegate> {
UITextView
*textView; }
@property
(nonatomic, retain) UITextView *textView; @end |
在.m文件中初始化这个textview,写入代码如下:
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self.textView
= [[[UITextView alloc] initWithFrame:self.view.frame] autorelease]; //初始化大小并自动释放
self.textView.textColor
= [UIColor blackColor];//设置textview里面的字体颜色
self.textView.font
= [UIFont fontWithName:@"Arial" size:18.0];//设置字体名字和字体大小
self.textView.delegate
= self;//设置它的委托方法
self.textView.backgroundColor
= [UIColor whiteColor];//设置它的背景颜色
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
self.textView.returnKeyType
= UIReturnKeyDefault;//返回键的类型
self.textView.keyboardType
= UIKeyboardTypeDefault;//键盘类型
self.textView.scrollEnabled
= YES;//是否可以拖动
self.textView.autoresizingMask
= UIViewAutoresizingFlexibleHeight;//自适应高度
[self.view
addSubview: self.textView];//加入到整个页面中 |
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:
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-
(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:
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#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:
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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:
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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:
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[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:
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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:
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-(BOOL)canPerformAction:(SEL)action
withSender:(id)sender {
if(action
== @selector(changeColor:)) {
if(textView.selectedRange.length>0)
return YES;
}
return NO;
} |
效果图如下所示:

今天的UITextView就讲到这里,主要讲了UITextView的初始化和开发中会遇到的一些问题和自定义等问题。谢谢大家支持哈。
2、textView.contentSize.Height是输入的行数所占的高度,每行占15,可以用这个参数实现比如:TextView自适应输入的文本高度等功能。
3、 修改边框
mTextView.layer.masksToBounds=YES;
mTextView.layer.borderWidth=0.7;
mTextView.layer.borderColor=[[UIColor redColor] CGColor];
4、
zoomView = [self browserViewInWebView];
- (void)keyboardWillShow:(NSNotification *)aNotification
{
CGRect keyboardRect = [[[aNotification userInfo] objectForKey:
UIKeyboardFrameEndUserInfoKey] CGRectValue];
NSTimeInterval animationDuration =
[[[aNotification userInfo] objectForKey:
UIKeyboardAnimationDurationUserInfoKey] doubleValue];
CGRect frame = zoomView.frame;
NSLog(@"scroll height1:%f",frame.size.height);
frame.size.height -= keyboardRect.size.height;
[UIView beginAnimations:@"ResizeForKeyborad" context:nil];
[UIView setAnimationDuration:animationDuration];
[self scrollViewOfWebview:self].frame = frame;
[UIView commitAnimations];
}
- (void)keyboardWillHide:(NSNotification *)aNotification
{
CGRect keyboardRect = [[[aNotification userInfo] objectForKey:
UIKeyboardFrameEndUserInfoKey] CGRectValue];
NSTimeInterval animationDuration =
[[[aNotification userInfo] objectForKey:
UIKeyboardAnimationDurationUserInfoKey] doubleValue];
CGRect frame = zoomView.frame;
frame.size.height += keyboardRect.size.height;
[UIView beginAnimations:@"ResizeForKeyborad" context:nil];
[UIView setAnimationDuration:animationDuration];
[self scrollViewOfWebview:self].frame = frame;
[UIView commitAnimations];
}
本文详细介绍了如何在 iOS 开发中高效使用 UITextView 控件,包括初始化配置、键盘管理、自适应高度、圆角设置及自定义菜单等实用技巧。
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