1，首先定義一個(gè)屬性@property(assign,nonatomic) BOOL isVisable;

2,在-(void)viewWillAppear 中添加對(duì)鍵盤的監(jiān)聽

? ? NSNotificationCenter *center = [NSNotificationCenter defaultCenter];

? ? [center addObserver:selfselector:@selector(keyboardDidShow)name:UIKeyboardDidShowNotificationobject:nil];

? ? [center addObserver:selfselector:@selector(keyboardDidHide)name:UIKeyboardWillHideNotificationobject:nil];

3，-(void)keyboardDidShow{

self.isVisable = YES;

}

-(void)keyboardDidHide{

self.isVisable = NO;

}

4,在-(void)viewWillDisappear 中

? ? [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardDidShowNotification object:nil];

? ? [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardDidHideNotification object:nil];