内容简介：很久没写技术文章里,本篇记录了一下一个键盘弹出的小细节动画,像微信一样流程上图
很久没写技术文章里,本篇记录了一下一个键盘弹出的小细节动画,像微信一样流程
上图
动画细节代码
细节核心主要是通知中的一些key
- 动画时长
- 动画的出现方式
…
下面的通知是接收 键盘将要出现的通知 UIKeyboardWillShowNotification
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didReceiveKeyboardShowNotification:) name:UIKeyboardWillShowNotification object:nil];
然后是实现的核心代码
- (void)didReceiveKeyboardShowNotification:(NSNotification *)noti { NSDictionary *userInfo = noti.userInfo; NSTimeInterval animationDuration; UIViewAnimationCurve animationCurve; CGRect keyboardFrame; [[userInfo objectForKey:UIKeyboardAnimationCurveUserInfoKey] getValue:&animationCurve]; [[userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] getValue:&animationDuration]; [[userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] getValue:&keyboardFrame]; UIViewAnimationOptions animationOptions = animationCurve << 16; self.bottomConstrains.offset = -CGRectGetHeight(keyboardFrame); [UIView animateWithDuration:animationDuration delay:0. options:animationOptions animations:^{ [self.view setNeedsUpdateConstraints]; [self.view layoutIfNeeded]; } completion:^(BOOL finished) { }]; }
self.bottomConstrains.offset = -CGRectGetHeight(keyboardFrame); 是我写的约束 详细请参考demo
键盘消失也是一样的 UIKeyboardWillHideNotification 接收这个key
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didReceiveKeyboardHideNotification:) name:UIKeyboardWillHideNotification object:nil];
消失的时候 把约束偏移量设置 0 即可
- (void)didReceiveKeyboardHideNotification:(NSNotification *)noti { NSDictionary *userInfo = noti.userInfo; NSTimeInterval animationDuration; UIViewAnimationCurve animationCurve; CGRect keyboardFrame; [[userInfo objectForKey:UIKeyboardAnimationCurveUserInfoKey] getValue:&animationCurve]; [[userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] getValue:&animationDuration]; [[userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] getValue:&keyboardFrame]; UIViewAnimationOptions animationOptions = animationCurve << 16; self.bottomConstrains.offset = 0; [UIView animateWithDuration:animationDuration delay:0. options:animationOptions animations:^{ [self.view setNeedsUpdateConstraints]; [self.view layoutIfNeeded]; } completion:^(BOOL finished) { }]; }
self.bottomConstrains.offset = 0; //设置偏移量会原来位置
利用Masonry做的动画
最后 别忘记移除通知
- (void)dealloc { [[NSNotificationCenter defaultCenter] removeObserver:self]; }
总结
键盘弹出这个微小的细节 很容易被大家忽视,写这篇文章是为了记录知识和技巧,希望各位多多指教
全文完
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