解决iOS UITextField 编辑时文本偏移问题

- (UITextField *)textField{
 if (_textField == nil) {
  _textField = [UITextField new];
  _textField.borderStyle = UITextBorderStyleNone;
  _textField.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
  _textField.textAlignment = NSTextAlignmentLeft;
  _textField.clearButtonMode = UITextFieldViewModeWhileEditing;
  _textField.tintColor = [UIColor redColor];
  _textField.font = GXFont(16);
  _textField.returnKeyType = UIReturnKeyDone;
  _textField.delegate = self;
 }
 return _textField;
}
- (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier{
 if (self = [super initWithStyle:style reuseIdentifier:reuseIdentifier]) {
  [self.contentView addSubview:self.textField];
 }
 return self;
}
- (void)layoutSubviews{
 [super layoutSubviews];
 self.textField.frame = (CGRect){{kDefaultSpace, 0},{GXScreenWidth-2*kDefaultSpace, CGRectGetHeight(self.frame)}};
}

 self.textFidle.textAlignment = NSTextAlignmentLeft;
 self.textFidle.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
 self.textFidle.borderStyle = UITextBorderStyleNone;
 self.textFidle.backgroundColor = [UIColor lightGrayColor];