UITextView控件的用法详解
2011-11-10 20:35 张智清 阅读(33303) 评论(0) 编辑 收藏 举报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：
1 #import <UIKit/UIKit.h>
2
3 @interface TextViewController : UIViewController <UITextViewDelegate>{
4 UITextView *textView;
5 }
6
7 @property (nonatomic, retain) UITextView *textView;
8
9 @end
在.m文件中初始化这个textview，写入代码如下：
1 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
21 [self.view addSubview: self.textView];//加入到整个页面中
文本字段实现了UITextInputTrait协议，其提供了7个属性来定义字段处理文本输入的方式：autocapitalizationType、autocorrectionType、enablesReturnKeyAutomatically、keyboardAppearance、keyboardType、returnKeyType、secureTextEntry。
其它，当文本字段为空时，placeholder文本以浅灰色显示，提供一个用户提示。通过设置clearButtonMode可以指定是否以及何时显示清除按钮。
2. UITextView退出键盘的几种方式
（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，当然要先实现UITextViewDelegate。
- (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。
#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;
}
（3）还有你也可以自定义其他视图控件加载到键盘上用来退出，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。
1 UIToolbar * topView = [[UIToolbar alloc]initWithFrame:CGRectMake(0, 0, 320, 30)];
2
3 [topView setBarStyle:UIBarStyleBlack];
4
5 UIBarButtonItem * helloButton = [[UIBarButtonItem alloc]initWithTitle:@"Hello" style:UIBarButtonItemStyleBordered target:self action:nil];
6
7 UIBarButtonItem * btnSpace = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil];
8
9
10
11 UIBarButtonItem * doneButton = [[UIBarButtonItem alloc]initWithTitle:@"Done" style:UIBarButtonItemStyleDone target:self action:@selector(dismissKeyBoard)];
12
13 NSArray * buttonsArray = [NSArray arrayWithObjects:helloButton,btnSpace,doneButton,nil];
14
15 [doneButton release];
16
17 [btnSpace release];
18
19 [helloButton release];
20
21 [topView setItems:buttonsArray];
22
23 [tvTextView setInputAccessoryView:topView];
24
25 -(IBAction)dismissKeyBoard
26
27 {
28
29 [tvTextView resignFirstResponder];
30
31 }
