Masonry constrained animations and keyboard bounce

要求：
When the keyboard is blocking the input box, the input box automatically bounces up to the top of the keyboard.
实现：
Here's another way to use the masonry mas_updateConstraints . This method is used to update control constraints.
The specific implementation of the demo can be downloaded to see, this is only posted when the keyboard Popup processing code:

- (void) Keyboardwillchangeframenotification: (Nsnotification *) Notification {Get keyboard Basics (animation duration vs. keyboard height)Nsdictionary *userinfo = [notification UserInfo];CGRect rect = [userinfo[Uikeyboardframebeginuserinfokey] Cgrectvalue]; cgfloat keyboardheight = cgrectgetheight (rect); cgfloat keyboardduration = [userinfo[uikeyboardanimationdurationuserinfokey] doublevalue]; //Modify the bottom margin constraint [_textfield mas_updateconstraints:^ (Masconstraintmaker *make) {make. Bottom. Mas_equalto (- Keyboardheight); }]; //Update constraint [UIView animatewithduration:keyboardduration animations:^{[self. View layoutifneeded];};}

Summarize:

1. You can add Left/right/top/bottom/size/height/width/insert constraints to the control;
2. library provides three methods, mas_makeconstraints add constraints, mas_updateconstraints modify constraints, Mas_ Remakeconstraints clears the previous constraint and adds a new constraint;
3. a constraint on the view can be obtained by view.mas_bottom;

Masonry constrained animations and keyboard bounce