ios 自定义键盘输入框 输入框跟随文字换行变宽 输入框随着键盘消失出现位置进行变化

@property (nonatomic,copy) void(^changeInputViewFrame)(float viewH);

- (void)textViewDidChange:(UITextView *)textView{

if (textView != self.inputTextView) {
return;
}

CGSize size = [self.inputTextView.text sizeWithAttributes:@{UIFontDescriptorCascadeListAttribute:[UIFont systemFontOfSize:15.0]}];
CGFloat singleH = size.height;
NSInteger lines = (NSInteger)self.inputTextView.contentSize.height/singleH;
NSLog(@"行数行数======%ld",lines);
if (lines>self.minLines) {
self.minLines = lines;
if (self.changeInputViewFrame&&lines<=7) {
self.changeInputViewFrame(singleH);
}
}
if (lines<self.minLines) {
        self.minLines = lines;
        if (self.changeInputViewFrame&&lines>2) {
            self.changeInputViewFrame(singleH*(-1));
        }
    }

}

__weak CustomChatViewController * weakSelf = self;
self.inputBar.changeInputViewFrame = ^(float viewH){
weakSelf.inputBar.frame = CGRectMake(0, weakSelf.inputBar.frame.origin.y-viewH, weakSelf.view.frame.size.width, weakSelf.inputBar.frame.size.height+viewH);
//自定义输入view刷新约束
[weakSelf.inputBar layoutIfNeeded];
};

/增加监听，当键盘出现或改变时收出消息
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillShow:)
name:UIKeyboardWillShowNotification
object:nil];

//增加监听，当键退出时收出消息
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillHide:)
name:UIKeyboardWillHideNotification
object:nil];

- (void)keyboardWillShow:(NSNotification *)aNotification
{
//获取键盘的高度
/*
iphone 6:
中文
2014-12-31 11:16:23.643 Demo[686:41289] 键盘高度是  258
2014-12-31 11:16:23.644 Demo[686:41289] 键盘宽度是  375
英文
2014-12-31 11:55:21.417 Demo[1102:58972] 键盘高度是  216
2014-12-31 11:55:21.417 Demo[1102:58972] 键盘宽度是  375

iphone  6 plus：
英文：
2014-12-31 11:31:14.669 Demo[928:50593] 键盘高度是  226
2014-12-31 11:31:14.669 Demo[928:50593] 键盘宽度是  414
中文：
2015-01-07 09:22:49.438 Demo[622:14908] 键盘高度是  271
2015-01-07 09:22:49.439 Demo[622:14908] 键盘宽度是  414

iphone 5 :
2014-12-31 11:19:36.452 Demo[755:43233] 键盘高度是  216
2014-12-31 11:19:36.452 Demo[755:43233] 键盘宽度是  320

ipad Air：
2014-12-31 11:28:32.178 Demo[851:48085] 键盘高度是  264
2014-12-31 11:28:32.178 Demo[851:48085] 键盘宽度是  768

ipad2 ：
2014-12-31 11:33:57.258 Demo[1014:53043] 键盘高度是  264
2014-12-31 11:33:57.258 Demo[1014:53043] 键盘宽度是  768
*/
NSDictionary *userInfo = [aNotification userInfo];
NSValue *aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];
CGRect keyboardRect = [aValue CGRectValue];
float height = keyboardRect.size.height;
self.inputBar.frame = CGRectMake(0, self.view.frame.size.height-50-height, self.view.frame.size.width, 50);
}

//当键退出时调用
- (void)keyboardWillHide:(NSNotification *)aNotification{

[UIView animateWithDuration:0.5 animations:^{
self.inputBar.frame = CGRectMake(0, self.view.frame.size.height-50, self.view.frame.size.width, 50);
}];
}