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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:
#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:
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:
- ( 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; |
[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" ]) { |
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[textView resignFirstResponder]; |
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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]; |
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UIBarButtonItem * helloButton = [[UIBarButtonItem alloc]initWithTitle: @"Hello" style:UIBarButtonItemStyleBordered target:self action:nil]; |
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UIBarButtonItem * btnSpace = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil]; |
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UIBarButtonItem * doneButton = [[UIBarButtonItem alloc]initWithTitle: @"Done" style:UIBarButtonItemStyleDone target:self action:@selector(dismissKeyBoard)]; |
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NSArray * buttonsArray = [NSArray arrayWithObjects:helloButton,btnSpace,doneButton,nil]; |
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[topView setItems:buttonsArray]; |
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[tvTextView setInputAccessoryView:topView]; |
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-(IBAction)dismissKeyBoard |
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[tvTextView resignFirstResponder]; |
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(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]; |
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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)]; |
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(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]]; |
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) |
实现后如下图:
UITextView详解
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原文地址:http://my.oschina.net/u/2344008/blog/477805