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
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持 码农网
猜你喜欢:
- Android获取软键盘的高度、键盘的打开与关闭、监听键盘处于打开还是关闭状态
- ios 最新系统bug与解决——微信公众号中弹出键盘再收起时，原虚拟键盘位点击
- Swift关闭UITextView键盘
- ios 最新系统bug与解决——微信公众号中弹出键盘再收起时，原虚拟键盘位点击事件无效
- Swift自定义表情键盘+录音
- Android 软键盘踩坑记
本站部分资源来源于网络，本站转载出于传递更多信息之目的，版权归原作者或者来源机构所有，如转载稿涉及版权问题，请联系我们。
