1. 制作一个textview，遵守协议，设置相关属性，这里是我做的例子
协议：UITextViewDelegate
textview.backgroundColor=[UIColor whiteColor]; //背景色
textview.scrollEnabled = NO; //当文字超过视图的边框时是否允许滑动，默认为“YES”
textview.delegate = self; //设置代理方法的实现类
textview.font=[UIFont fontWithName:@"Arial" size:18.0]; //设置字体名字和字体大小;
textview.returnKeyType = UIReturnKeyDefault;//return键的类型
// textview.keyboardType = UIKeyboardTypeDefault;//键盘类型换行
textview.returnKeyType = UIReturnKeyDone;//键盘类型完成 不是用完成的话 当文字过多 无法回收键盘
// textview.textAlignment = NSTextAlignmentLeft; //文本显示的位置默认为居左
textview.dataDetectorTypes = UIDataDetectorTypeAll; //显示数据类型的连接模式（如电话号码、网址、地址等）
textview.textColor = [UIColor blackColor];
textview.autoresizingMask = UIViewAutoresizingFlexibleHeight;
textview.text =NSLocalizedString(@"qingshuru",@"");//设置显示的文本内容
self.automaticallyAdjustsScrollViewInsets=NO;
2. 实现高度自适应
（1）
//内容改变自动调用 自适应文本高度
- (void)textViewDidChange:(UITextView *)textView;
（2）在上面的方法中写入
CGSize size=[textview sizeThatFits:CGSizeMake(CGRectGetWidth(textview.frame), MAXFLOAT)];
CGRect frame=textview.frame;
frame.size.height=size.height;
textview.frame=frame;
这样就完成了自适应高度
（3）对文字输入的字数进行限制
if([[self currentLanguage] compare:@"zh-Hans-CN" options:NSCaseInsensitiveSearch]==NSOrderedSame || [[self currentLanguage] compare:@"zh-Hant-CN" options:NSCaseInsensitiveSearch]==NSOrderedSame)
{
if (textView.text.length > 300)
{
textView.text = [textView.text substringToIndex:300];
}
}
else{
if (textView.text.length > 500)
{
textView.text = [textView.text substringToIndex:500];
}
}
3. 实现当文字过多键盘遮挡问题
（1）对textview设置监听
//注册通知,监听键盘出现
[[NSNotificationCenter defaultCenter]addObserver:self
selector:@selector(handleKeyboardDidShow:)
name:UIKeyboardDidShowNotification
object:nil];
//注册通知，监听键盘消失事件
[[NSNotificationCenter defaultCenter]addObserver:self
selector:@selector(handleKeyboardDidHidden)
name:UIKeyboardDidHideNotification
object:nil];
（2）实现监听方法
- (void)handleKeyboardDidShow:(NSNotification*)paramNotification
{
NSLog(@"监听方法");
//获取键盘高度
keyboardRectAsObject=[[paramNotification userInfo]objectForKey:UIKeyboardFrameEndUserInfoKey];
[keyboardRectAsObject getValue:&keyboardRect];
textview.contentInset=UIEdgeInsetsMake(0, 0,keyboardRect.size.height, 0);
animationTime = [paramNotification.userInfo[@"UIKeyboardAnimationDurationUserInfoKey"] floatValue];
}
- (void)handleKeyboardDidHidden
{
textview.contentInset=UIEdgeInsetsZero;
}
（3）实现textview的delegate方法
在- (void)textViewDidChange:(UITextView *)textView;方法中写入
self.view.transform = CGAffineTransformIdentity;
UIView *editView = textview;
CGRect tfRect = [editView.superview convertRect:editView.frame toView:self.view];
// NSLog(@"%@", keyboardRectAsObject);
CGRect keyBoardF = [keyboardRectAsObject CGRectValue];
CGFloat _editMaxY = CGRectGetMaxY(tfRect);
CGFloat _keyBoardMinY = CGRectGetMinY(keyBoardF);
// NSLog(@"%f %f", _editMaxY, _keyBoardMinY);
if (keyboardRectAsObject) {
if (_keyBoardMinY < _editMaxY && _editMaxY-_keyBoardMinY>20) {
CGFloat moveDistance = _editMaxY - _keyBoardMinY;
[UIView animateWithDuration:animationTime animations:^{
textview.transform = CGAffineTransformTranslate(textview.transform, 0, -moveDistance);
}];
}
}
此时已经实现了高度自适应和键盘遮挡问题
