如何让UIViewController自动弹出PickerView

因为响应者的一下属性inputView和inputAccessoryView都是只读的，所以如果想要指定弹出的view就要override 下面两个属性的get和set方法

UIResponder (UIResponderInputViewAdditions)

@property (readonly,
retain) UIView *inputView NS_AVAILABLE_IOS(3_2);

@property (readonly,
retain) UIView *inputAccessoryView NS_AVAILABLE_IOS(3_2);

//write this code in UIViewController
//UIViewController default is NO.
//override
- (BOOL)canBecomeFirstResponder {
    return YES;
}

//override
- (UIView*) inputView {
    return [[UIDatePicker alloc] init];
}

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