问题：横屏下第一次弹出键盘高度异常
- (void)handleKeyboardWillShowNotification:(NSNotification *)notification {
NSTimeInterval animationDuration = 0;
CGRect keyboardFrame = CGRectZero;
NSDictionary *userInfo = [notification userInfo];
[[userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] getValue:&animationDuration];
[[userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] getValue:&keyboardFrame];
printf("keyboardFrame height: %f\n", keyboardFrame.size.height);
[self showWithAnimationDuration:animationDuration keyboardFrame:keyboardFrame];
}
弹出新window，rootViewController里面有个 UITextField ，然后调用 becomeFirstResponder ，启动app，第1次弹出键盘时，会走进两次通知，打印键盘高度：
keyboardFrame height: 125.000000 keyboardFrame height: 302.000000
这两个高度都是错误的，会导致键盘上面的工具条错位：
第2次弹出键盘时：打印键盘高度为：
keyboardFrame height: 248.000000
这时候就是正常的高度了。
需要解决第一次异常的问题。
解决：直接取子view判断
查看层级，发现键盘window有个子view UIInputSetHostView，这就是键盘显示的父view，这时候取得这个view，也就取得了键盘的真正高度：
- (CGFloat)keyboardHeight {
UIWindow *keyboardWindow = [[[UIApplication sharedApplication] windows] lastObject];
UIView *inputView = [keyboardWindow.rootViewController.view tkp_findSubview:@"UIInputSetHostView"];
if (inputView) {
return inputView.tkp_height;
}
return 0;
}
其中 tkp_findSubview: 方法为 UIView 的分类方法：
- (UIView *)tkp_findSubview:(NSString *)name {
return [self tkp_findSubview:name resursion:NO];
}
- (UIView *)tkp_findSubview:(NSString *)name resursion:(BOOL)resursion {
Class class = NSClassFromString(name);
for (UIView *subview in self.subviews) {
if ([subview isKindOfClass:class]) {
return subview;
}
}
if (resursion) {
for (UIView *subview in self.subviews) {
UIView *tempView = [subview tkp_findSubview:name resursion:resursion];
if (tempView) {
return tempView;
}
}
}
return nil;
}
