iOS Monitor keyboard height changes

Recent projects, there is a similar to the comment forwarding function, the bottom of the screen has an input box to do with TextView, when TextView becomes the first responder, its Y value changes with the height of the keyboard, to ensure that the TextView close to the keyboard, but will not be blocked by the keyboard.

Here's how I implemented it: (using notifications)

Keyboard notifications
Notification (location and size) of the keyboard when the frame changes
Uikeyboardwillchangeframenotification
Uikeyboarddidchangeframenotification
Notifications when the keyboard is displayed
Uikeyboardwillshownotification
Uikeyboarddidshownotification
Notifications issued when the keyboard is hidden
Uikeyboardwillhidenotification
Uikeyboarddidhidenotification

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillChangeFrame:) name:UIKeyboardWillChangeFrameNotification object:nil];//在这里注册通知

Here is the Listener notification:

Pragma mark-monitoring method

/**

• Called when the frame of the keyboard changes (show, hide, etc.)
  */

• (void) Keyboardwillchangeframe: (nsnotification *) notification
  {
  if (self.picking) return;
  /**
  Notification.userinfo = @{
  Keyboard popup \ Hidden frame
  Uikeyboardframeenduserinfokey = Nsrect: {{0, 352}, {320, 216}},
  Keyboard pop-up \ Hide Time spent
  Uikeyboardanimationdurationuserinfokey = 0.25,
  Keyboard popup \ Hide Animation execution Rhythm (first fast, slow, constant)
  Uikeyboardanimationcurveuserinfokey = 7
  }
  */

  Nsdictionary *userinfo = Notification.userinfo;

  Duration of animation
  Doubleduration = [Userinfo[uikeyboardanimationdurationuserinfokey] doublevalue];

  The frame of the keyboard
  CGRect KEYBOARDF = [Userinfo[uikeyboardframeenduserinfokey] cgrectvalue];

  Performing animations
  [UIView animatewithduration:duration animations:^{
  Y value of the toolbar = = y value of the keyboard-height of the tool bar
  The Y value of the IF (Keyboardf.origin.y > Self.view.height) {//keyboard has far exceeded the height of the controller view
  Self.toolbar.y = self.view.height-self.toolbar.height;//The self.toolbar here is my input box.

  }else{    self.toolbar.y = keyboardF.origin.y - self.toolbar.height;}

  }];
  }

Of course, here I wrote a category for UIView, implemented as follows:
declarations in. h files

@interfaceUIView (Extension)
@property (nonatomic, assign) CGFloat x;
@property (nonatomic, assign) CGFloat y;
@property (nonatomic, assign) cgfloat width;
@property (nonatomic, assign) cgfloat height;
@property (nonatomic, assign) CGFloat CenterX;
@property (nonatomic, assign) CGFloat centery;
@property (nonatomic, assign) cgsize size;
@property (nonatomic, assign) Cgpoint origin;
@end
Implementations in. m files (overriding setter and getter)

@implementationUIView (Extension)

• (void) SetX: (cgfloat) x
  {
  CGRect frame = self.frame;
  frame.origin.x = x;
  Self.frame = frame;
  }

• (void) Sety: (cgfloat) y
  {
  CGRect frame = self.frame;
  FRAME.ORIGIN.Y = y;
  Self.frame = frame;
  }

• (cgfloat) x
  {
  returnself.frame.origin.x;
  }

• (cgfloat) Y
  {
  RETURNSELF.FRAME.ORIGIN.Y;
  }

• (void) Setcenterx: (cgfloat) CenterX
  {
  Cgpoint Center = self.center;
  center.x = CenterX;
  Self.center = center;
  }

• (cgfloat) CenterX
  {
  returnself.center.x;
  }

• (void) Setcentery: (cgfloat) CenterY
  {
  Cgpoint Center = self.center;
  Center.y = CenterY;
  Self.center = center;
  }

• (cgfloat) CenterY
  {
  RETURNSELF.CENTER.Y;
  }

• (void) SetWidth: (cgfloat) width
  {
  CGRect frame = self.frame;
  Frame.size.width = width;
  Self.frame = frame;
  }

• (void) SetHeight: (cgfloat) height
  {
  CGRect frame = self.frame;
  Frame.size.height = height;
  Self.frame = frame;
  }

• (cgfloat) Height
  {
  Returnself.frame.size.height;
  }

• (cgfloat) Width
  {
  Returnself.frame.size.width;
  }

• (void) SetSize: (cgsize) size
  {
  CGRect frame = self.frame;
  frame.size = size;
  Self.frame = frame;
  }

• (cgsize) Size
  {
  Returnself.frame.size;
  }

• (void) Setorigin: (Cgpoint) origin
  {
  CGRect frame = self.frame;
  Frame.origin = origin;
  Self.frame = frame;
  }

• (Cgpoint) Origin
  {
  Returnself.frame.origin;
  }
  @end
  A friend in need can use it directly.

iOS Monitor keyboard height changes