+ (void)parseKeyboardNotification:(NSNotification *)notification
inRelationToView:(UIView *)view
info:(void(^)(NSTimeInterval keyboardAnimationDuration, CGRect keyboardFrameInView, UIViewAnimationOptions keyboardAnimationOptions))callback
{
NSParameterAssert(notification != nil);
NSParameterAssert(view != nil);
NSDictionary *userInfo = [notification userInfo];
UIViewAnimationCurve animationCurve = [userInfo[UIKeyboardAnimationCurveUserInfoKey] integerValue];
UIViewAnimationOptions animationOption = animationCurve << 16; // https://devforums.apple.com/message/878410#878410
NSTimeInterval animationDuration = [userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
// http://stackoverflow.com/a/16615391/202451
CGRect screenRect = [[userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
CGRect windowRect = [view.window convertRect:screenRect fromWindow:nil];
CGRect viewRect = [view convertRect:windowRect fromView:nil];
callback(animationDuration, viewRect, animationOption);
}
可以这样使用
- (void)keyboardWillShowOrHide:(NSNotification *)notification
{
[AGKeyboardInfo parseKeyboardNotification:notification inRelationToView:self.view info:^(NSTimeInterval keyboardAnimationDuration, CGRect keyboardFrameInView, UIViewAnimationOptions keyboardAnimationOptions) {
[UIView animateWithDuration:keyboardAnimationDuration delay:0 options:keyboardAnimationOptions animations:^{
// do any modifications to your views
} completion:nil];
}];
}