iOS中设置点击textField 在textField上面的控

首先

//注册通知:键盘frame位置和尺寸发生改变的通知

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillChangeFrame:) name:UIKeyboardWillChangeFrameNotification  object:nil];

然后 

// 获得屏幕的高度

CGFloat screenH = [UIScreen mainScreen].bounds.size.height;

// 获得通知信息

NSDictionary *userInfo = note.userInfo;

// 获得键盘显示完毕或隐藏完毕的frame

CGRect keyboardFrame =  [userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];

// 获得键盘的y值

CGFloat keyboardY = keyboardFrame.origin.y;

// 计算平移的距离

CGFloat translationY = keyboardY - screenH  ;

// 平移控制器的view

// 显示平移的距离是:-258 隐藏是 0

self.view.transform = CGAffineTransformMakeTranslation(0, translationY);