利用坐标转换在键盘高度发生变化时,视图的处理


目前负责的项目中 有很多页面都使用到textField,而且是多个TextFiled.当键盘出现时对视图的移动处理就成为了关键。

我的方法是,注册键盘frame发生变化的通知,然后在通知中将当前的textField的坐标转换为keyWindow中的坐标,同时获取键盘的坐标原点,计算出textField的maxFrame和键盘坐标原点之间的间距 从而让视图向上移动相应的距离。

有心人或许会注意到 每当textFiled发生变化时,通知中心都会发一个通知 因此我们只需要在通知的方法中,对视图的遮挡进行处理即可。

另一个要点就是:如何给键盘增加附属视图,我在项目中是对附属视图进行了封装,然后将附属视图添加在keyWindow上

```

//TODO:辅助视图

- (HHInputAccessoryView *)accessoryView{

if (_accessoryView == nil) {

_accessoryView = [[HHInputAccessoryView alloc]initWithTextFields:_textFields];

__weak typeof(&*self) weakSlef = self;

_accessoryView.delegate = weakSlef;

[HHKeyWindow addSubview:_accessoryView];

}

return _accessoryView;

}

```

//注册通知

```

[HHNotificationCenter addObserver:self selector:@selector(didReceiveKeyboardChange:) name:UIKeyboardWillChangeFrameNotification object:nil];

```

//通知的处理

```

//TODO: 通知

- (void)didReceiveKeyboardChange:(NSNotification *)noti{

CGRect rect=[[noti.userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];

// UIKeyboardAnimationDurationUserInfoKey 对应键盘弹出的动画时间

CGFloat animationDuration = [[noti.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] floatValue];

NSInteger animationCurve = [[noti.userInfo objectForKey:UIKeyboardAnimationCurveUserInfoKey] integerValue];

[UIView beginAnimations:nil context:nil];

[UIView setAnimationDuration:animationDuration];

[UIView setAnimationCurve:(UIViewAnimationCurve)animationCurve];//设置添加按钮的动画类型

NSNumber *isShowKeyboardValue = [noti.userInfo objectForKey:UIKeyboardIsLocalUserInfoKey];

BOOL isShowKeyboard = isShowKeyboardValue.boolValue;

if (isShowKeyboard)

{

_keyboardRect = rect;

///键盘高度更改

[self.accessoryView setFrame:CGRectMake(0, rect.origin.y - 45 , HHMainScreenWidth, 45)];

self.currentTF = self.accessoryView.currentTF;

}else{

///键盘隐藏

[self.accessoryView setFrame:CGRectMake(0, HHMainScreenHeight, HHMainScreenWidth, 45)];

}

[UIView commitAnimations];

}

```


当当前的textFiled发生变化时

```

- (void)setCurrentTF:(UITextField *)currentTF{

_currentTF = currentTF;

[_currentTF becomeFirstResponder];

//对当前TF的最大坐标和键盘的坐标点进行比较,判断视图移动的距离

//坐标转化

_bgView.frame = CGRectMake(0, 0, HHMainScreenWidth, HHMainScreenHeight-50);

CGRect rectY = [currentTF convertRect:currentTF.frame toView:HHKeyWindow];

CGFloat currenMaxY = CGRectGetMaxY(rectY);

CGFloat keyboardY = _keyboardRect.origin.y-45;

if (_currentTF == _shopDescTF) {

currenMaxY += 20;

}

if (currenMaxY >= keyboardY) {

_bgView.frame = CGRectMake(0, -(currenMaxY-keyboardY)-10, HHGet_W(_bgView), HHGet_H(_bgView));

}

}

```

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