效果展示

demo.gif

使用方式

（考虑到并不是每个页面中都需要加入自适应输入框的，一个项目中实际上需要也较少，按需加入更合适，节省内存占用）

- (void)viewDidLoad {
    [super viewDidLoad];
    [KeyBoardObserver autoScrollWithTargetView:_textField scrollView:_scrolllview];
    [KeyBoardObserver autoScrollWithTargetView:_textView scrollView:_scrolllview];
}

其中 _textField和_textView是需要加入键盘自适应的实例对象，_scrolllview是它们的父级视图

实现原理

实现的代码也很少，不超过50行，已实现自动释放，支持随用随取，用完释放。

+ (void)autoScrollWithTargetView:(UIView*)targetView scrollView:(UIScrollView*)scrollView{
    KeyBoardObserver *sinton = [KeyBoardObserver new];
    sinton.targetView = targetView;
    sinton.sv = scrollView;
    objc_setAssociatedObject(targetView, associatedKey, sinton, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
    [[NSNotificationCenter defaultCenter] addObserver:sinton selector:@selector(keyBordDidShow:) name:UIKeyboardWillShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:sinton selector:@selector(keyBordDidHide:) name:UIKeyboardWillHideNotification object:nil];
}

- (void)keyBordDidHide:(NSNotification*)noti{
    _responseScrollView = nil;
    if (_sv && _targetView && self.isCurrentKeyboardTarget) {
        [UIView animateWithDuration:0.3 animations:^{
            self->_sv.contentOffset = CGPointMake(0, _tableViewOriYOffset);
        }completion:^(BOOL finished) {
            self.isCurrentKeyboardTarget = NO;
        }];
    }
}

- (void)keyBordDidShow:(NSNotification*)noti{
    
    if (_responseScrollView != self.sv) {
        _tableViewOriYOffset = _sv.contentOffset.y;
        _responseScrollView = self.sv;
    }
    
    if (_sv && _targetView && [_targetView isFirstResponder]) {
        self.isCurrentKeyboardTarget = YES;
        CGRect keyBoardBounds = [[[noti userInfo]objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
        
        UIWindow* window = [UIApplication sharedApplication].keyWindow;
        CGRect windowFrame = [_targetView.superview convertRect:_targetView.frame toView:window];
        
        if (keyBoardBounds.origin.y <= (windowFrame.origin.y+windowFrame.size.height)) {
            CGFloat offsetY = windowFrame.origin.y + windowFrame.size.height - keyBoardBounds.origin.y;
            [_sv setContentOffset:CGPointMake(0, _sv.contentOffset.y + offsetY) animated:YES];
        }
    }
}

- (void)dealloc{
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

最后附 demo下载