1.在指定位置插入字符串：
NSMutableString *TextViewStr=[[NSMutableString alloc] initWithString:TextView.text];
[TextViewStr insertString:@"your strings" atIndex:TextView.selectedRange.location];
TextView.scrollEnabled=NO;
TextView.text=theTvStr;
theTV.scrollEnabled=YES;
2.获得行数(包括换行符也会计算在内)：
CGSize size = [[self.TextView text] sizeWithFont:[self.TextView font]];
// 2. 取出文字的高度
int length = size.height;
//3. 计算行数
int colomNumber = TextView.contentSize.height/length;
3.检测换行符：
- (BOOL)textView: (UITextView *)textview shouldChangeTextInRange: (NSRange)range replacementText: (NSString *)text {
if ([text isEqualToString:@" "]) {
NSLog(@"it is a row !!");
//...
}
return YES;
}
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. Now 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
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。
NSMutableString *TextViewStr=[[NSMutableString alloc] initWithString:TextView.text];
[TextViewStr insertString:@"your strings" atIndex:TextView.selectedRange.location];
TextView.scrollEnabled=NO;
TextView.text=theTvStr;
theTV.scrollEnabled=YES;
2.获得行数(包括换行符也会计算在内)：
CGSize size = [[self.TextView text] sizeWithFont:[self.TextView font]];
// 2. 取出文字的高度
int length = size.height;
//3. 计算行数
int colomNumber = TextView.contentSize.height/length;
3.检测换行符：
- (BOOL)textView: (UITextView *)textview shouldChangeTextInRange: (NSRange)range replacementText: (NSString *)text {
if ([text isEqualToString:@" "]) {
NSLog(@"it is a row !!");
//...
}
return YES;
}
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. Now 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
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。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:@" "]) {
[textView resignFirstResponder];
return NO;
}
return YES;
}
///////摘自网络