scrollview上的textfile随键盘的改变而改变位置

- (void)viewDidLoad {

[super viewDidLoad];

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardChange:) name:UIKeyboardWillHideNotification object:nil];

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardShow:) name:UIKeyboardWillShowNotification object:nil];

}

- (void) keyboardShow:(NSNotification *) notif

{

// 获得键盘尺寸

NSDictionary *info = notif.userInfo;

NSValue *aValue = [info objectForKeyedSubscript:UIKeyboardFrameEndUserInfoKey];

CGSize keyboardSize = [aValue CGRectValue].size;

if (scrollNum==0) {

//重新定义ScrollView的尺寸

CGRect viewFrame = self.scrollView.frame;

viewFrame.size.height -=(keyboardSize.height);  //原来的尺寸减去键盘的高度

self.scrollView.frame = viewFrame;

//获取当前文本框架大小

CGRect textFileRect = [textFile frame];

//滚动到当前文本框

[self.scrollView scrollRectToVisible:textFileRect animated:YES];

scrollNum=1;//防止多个textfile来回切换时多次执行

}

}

- (void) keyboardChange:(NSNotification *) notif

{

// 获得键盘尺寸

NSDictionary *info = notif.userInfo;

NSValue *aValue = [info objectForKeyedSubscript:UIKeyboardFrameEndUserInfoKey];

CGSize keyboardSize = [aValue CGRectValue].size;

//当键盘隐藏的时候，将scrollView重新放下来

CGRect viewFrame = self.scrollView.frame;

viewFrame.size.height += keyboardSize.height;

self.scrollView.frame = viewFrame;

scrollNum=0;

}