调用键盘时，输入框被遮掩的处理办法

[wwf77h]

调用键盘时，输入框被遮掩的处理办法：主要是要响应textFieldDidBeginEditing这个方法，在用户完成输入后，用户屏幕应该复原，
需要响应textFieldDidBeginEditing，感谢

“感恩的心”提供的代码，但是还有点小小的bug，我修改后的代码如下：

BOOL IsMove;
float width;
float height;
////////////////
//打开键盘时调整位置
-(void)textFieldDidBeginEditing:(UITextField *)textField{
if (textField == self.emailTextField) {
NSTimeInterval animationDuration = 0.30f;
[UIView beginAnimations:@"ResizeForKeyBoard" context:nil];
[UIView setAnimationDuration:animationDuration];
width = self.view.frame.size.width;
height = self.view.frame.size.height;
CGRect rect = CGRectMake(0.0f, -35, width, height);
self.view.frame = rect;
[UIView commitAnimations];
IsMove = true;
}
}

-(BOOL)textFieldShouldReturn:(UITextField *)textField{

//最下边那个文本框的
if (IsMove == true) {
NSTimeInterval animationDuration = 0.30f;
[UIView beginAnimations:@"ResizeForKeyboard" context:nil];
[UIView setAnimationDelay:animationDuration];
self.view.frame = CGRectMake(0, 0, width, height);
[UIView commitAnimations];
IsMove = false;

}

[textField resignFirstResponder];
return YES;

}