IOS代码段【不让键盘挡住输入框】

-(BOOL)textFieldShouldBeginEditing:(UITextField *)textField{    UITapGestureRecognizer*tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:selfaction:@selector(done:)];    tapGestureRecognizer.numberOfTapsRequired =1;    [self.view addGestureRecognizer:tapGestureRecognizer];  //只需要点击非文字输入区域就会响应hideKeyBoard    [tapGestureRecognizer release];        [UIViewbeginAnimations:@"ResizeForKeyboard" context:nil];    [UIView setAnimationDuration:0.3f];    float width=self.view.frame.size.width;    float height=self.view.frame.size.height;    CGRectrect=CGRectMake(0.0f,-80*(textField.tag),width,height);//上移80个单位，一般也够用了    self.view.frame=rect;    [UIView commitAnimations];        return YES;} -(void)done:(id)sender{    for (UIView *view in self.view.subviews) {        if ([view isKindOfClass:[UITextFieldclass]]) {            [view resignFirstResponder];                        [UIViewbeginAnimations:@"ResizeForKeyboard" context:nil];            [UIView setAnimationDuration:0.3f];            floatwidth=self.view.frame.size.width;            floatheight=self.view.frame.size.height;            CGRectrect=CGRectMake(0.0f,0.0f,width,height);            self.view.frame=rect;            [UIView commitAnimations];        }    }    }