###使用
效果
1.创建带小数点的数字键盘
LBNumberKeyboardView *lbTop = [[LBNumberKeyboardView alloc] initWithFrame:CGRectZero];
lbTop.textField = _textFieldTop;
2.用完成代替小数点
LBNumberKeyboardView *lbBottom = [[LBNumberKeyboardView alloc] initWithFrame:CGRectZero];
[lbBottom changeDotToDone];
lbBottom.textField = _textFieldBottom;
###结束