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[操作系统]解决键盘遮挡输入框的问题


1)首先得遵守协议UITextFieldDelegate
@interface userInfoViewController()<UITextFieldDelegate>
2)设置代理(下面的self都是输入框所在的父view)
  textField.delegate = self;
3)实现UITextFieldDelegate的三个方法即可:
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
    [textField resignFirstResponder];
    return YES;
}
 
/***下面是全屏的一个view, view上有子控件textField的使用方法***/
- (void)textFieldDidBeginEditing:(UITextField *)textField
{  
    CGRect frame = textField.frame;
    int offset = frame.origin.y + 32 - (self.frame.size.height - 256.0);//键盘高度256, textField高度32
   
    NSTimeInterval animationDuration = 0.30f;
    [UIView beginAnimations:@"ResizeForKeyboard" context:nil];
    [UIView setAnimationDuration:animationDuration];
   
    //将视图的Y坐标向上移动offset个单位,以使下面腾出地方用于软键盘的显示
    if(offset > 0)
        self.frame = CGRectMake(0.0f, -offset, self.frame.size.width, self.frame.size.height);
   
    [UIView commitAnimations];
}
 
- (void)textFieldDidEndEditing:(UITextField *)textField
{
     self.frame =CGRectMake(0, 0, self.frame.size.width, self.frame.size.height);
}
 
/***下面是全屏的一个view, view上有tableView, 每个tableViewCell有子控件 textField的使用方法***/
- (void)textFieldDidBeginEditing:(UITextField *)textField
{
    CGRect frame = textField.frame;
   
    int index = (int)(textField.tag - 0x1000);

    //30为textField的高度, (index - 1)为前面有几个cell, 90为tableView的y,即输入框底部距self.view的高度减去键盘的顶部距self.view的高度
    int offset = frame.origin.y + (index - 1) * 50 + 30 + 90 - (self.view.frame.size.height - 256.0);//键盘高度256
   
    NSTimeInterval animationDuration = 0.30f;
    [UIView beginAnimations:@"ResizeForKeyboard" context:nil];
    [UIView setAnimationDuration:animationDuration];
   
    //将视图的Y坐标向上移动offset个单位,以使下面腾出地方用于软键盘的显示
    if(offset > 0)
        self.infoList.frame = CGRectMake(10.0f, 90 - offset, self.infoList.frame.size.width, self.infoList.frame.size.height);
   
    [UIView commitAnimations];
}

- (void)textFieldDidEndEditing:(UITextField *)textField
{
    self.infoList.frame =CGRectMake(10, 90, [UIScreen mainScreen].bounds.size.width - 20, 300);
}
效果截图: