利用inputView 弹出 picker

推荐一个Button 弹起PickerView的源码，也可以作为工具类使用。

利用inputView 做键盘弹起动画。该如何做呢？
1.继承UIView
2.重写属性&方法

@property (readwrite) UIView *inputView;
@property (readwrite) UIView *inputAccessoryView;
- (BOOL)isUserInteractionEnabled
{
    return YES;
}

- (BOOL)canBecomeFirstResponder
{
    return YES;
}

3.添加TapGesture

UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(touchAction)];
    [tap setNumberOfTouchesRequired:1];
    [tap setNumberOfTapsRequired:1];
    [self addGestureRecognizer:tap];

4.实现方法touchAction