您应该使用通知中心来跟踪键盘,
NSNotificationCenter *center = [NSNotificationCenter defaultCenter];
[center addObserver:self selector:@selector(didShow) name:UIKeyboardDidShowNotification object:nil];
[center addObserver:self selector:@selector(didHide) name:UIKeyboardWillHideNotification object:nil];
//Resize your views in the below methods
- (void)didShow
{
}
- (void)didHide
{
}
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