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

2016年11月08日 16:24:03

阅读数：976

1.首先通过xib创建一个自定义输入框view

2.在自定义的输入框View中添加block，并实现textView的代理方法

@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));
        }
    }


}

3.在使用该自定义view的类中实现以下方法

 

 

__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];
    };

以上三步即可实现自定义输入框高度随着输入行数的变化而变化

 

4.在添加自定义输入框的类中实现输入框随着键盘出现消失，位置跟随变化

 

/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);
    }];
}

键盘失去响应根据自己需求添加