键盘覆盖输入框是一个很恶心的事，接下来是我通过算法来实现键盘的合理处置方式:
NSDictionary *userInfo = [notif userInfo];
NSValue *animationDurationObject = userInfo[UIKeyboardAnimationDurationUserInfoKey];
NSValue *keyboardEndRectObject = userInfo[UIKeyboardFrameEndUserInfoKey];
double animationDuration = 0.f;
CGRect keyboardEndRect = CGRectZero;
[animationDurationObject getValue:&animationDuration];
[keyboardEndRectObject getValue:&keyboardEndRect];
CGPoint point1 = [selectTf convertPoint:self.scView.bounds.origin toView:self.view.window];
CGFloat height = selectTf.frame.size.height;
CGPoint changePoint = CGPointMake(0, point1.y+height>keyboardEndRect.origin.y?point1.y+height-keyboardEndRect.origin.y+self.scView.contentOffset.y:self.scView.contentOffset.y);
[self.scView setContentOffset:changePoint animated:YES];
其中的selectTf指的是你光标所在的那个控件，self.scView指的是UIScrollview或者是UITableView,这样就可以通过CGPoint changePoint = CGPointMake(0, point1.y+height>keyboardEndRect.origin.y?point1.y+height-keyboardEndRect.origin.y+self.scView.contentOffset.y:self.scView.contentOffset.y);拿到偏移量赋值给self.scView
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下边是另外一个方法来处理这个键盘的问题，这个也很实用就是一个第三方键盘IQKeyboardManager，也可以在code4app上看到类似demoIQKeyboardManagerDemo,这个第三方只需要导入到工程中，不需要做任何设置就可以使用了。效果如图所示：
1.png
当然如何你在某一个页面不想使用这种键盘可以使用以下代码屏蔽：
- 关闭第三方键盘
[[IQKeyboardManager sharedManager] setEnable:NO];
[[IQKeyboardManager sharedManager] setShouldToolbarUsesTextFieldTintColor:NO]; - 开始第三方键盘
[[IQKeyboardManager sharedManager] setEnable:YES];
[[IQKeyboardManager sharedManager] setShouldToolbarUsesTextFieldTintColor:YES];
