1. 制作一個textview，遵守協(xié)議，設置相關屬性，這里是我做的例子
協(xié)議：UITextViewDelegate
textview.backgroundColor=[UIColor whiteColor]; //背景色
textview.scrollEnabled = NO;? ? //當文字超過視圖的邊框時是否允許滑動，默認為“YES”
textview.delegate = self;? ? ? //設置代理方法的實現(xiàn)類
textview.font=[UIFont fontWithName:@"Arial" size:18.0]; //設置字體名字和字體大小;
textview.returnKeyType = UIReturnKeyDefault;//return鍵的類型
//? ? textview.keyboardType = UIKeyboardTypeDefault;//鍵盤類型換行
textview.returnKeyType = UIReturnKeyDone;//鍵盤類型完成? 不是用完成的話 當文字過多 無法回收鍵盤
//? ? textview.textAlignment = NSTextAlignmentLeft; //文本顯示的位置默認為居左
textview.dataDetectorTypes = UIDataDetectorTypeAll; //顯示數(shù)據(jù)類型的連接模式（如電話號碼、網(wǎng)址、地址等）
textview.textColor = [UIColor blackColor];
textview.autoresizingMask = UIViewAutoresizingFlexibleHeight;
textview.text =NSLocalizedString(@"qingshuru",@"");//設置顯示的文本內(nèi)容
self.automaticallyAdjustsScrollViewInsets=NO;
2. 實現(xiàn)高度自適應
（1）
//內(nèi)容改變自動調(diào)用 自適應文本高度
- (void)textViewDidChange:(UITextView *)textView;
（2）在上面的方法中寫入
CGSize size=[textview sizeThatFits:CGSizeMake(CGRectGetWidth(textview.frame), MAXFLOAT)];
CGRect frame=textview.frame;
frame.size.height=size.height;
textview.frame=frame;
這樣就完成了自適應高度
（3）對文字輸入的字數(shù)進行限制
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. 實現(xiàn)當文字過多鍵盤遮擋問題
（1）對textview設置監(jiān)聽
//注冊通知,監(jiān)聽鍵盤出現(xiàn)
[[NSNotificationCenter defaultCenter]addObserver:self
selector:@selector(handleKeyboardDidShow:)
name:UIKeyboardDidShowNotification
object:nil];
//注冊通知，監(jiān)聽鍵盤消失事件
[[NSNotificationCenter defaultCenter]addObserver:self
selector:@selector(handleKeyboardDidHidden)
name:UIKeyboardDidHideNotification
object:nil];
（2）實現(xiàn)監(jiān)聽方法
- (void)handleKeyboardDidShow:(NSNotification*)paramNotification
{
NSLog(@"監(jiān)聽方法");
//獲取鍵盤高度
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）實現(xiàn)textview的delegate方法
在- (void)textViewDidChange:(UITextView *)textView;方法中寫入
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);
}];
}
}
此時已經(jīng)實現(xiàn)了高度自適應和鍵盤遮擋問題
