iOS开源-datePickerView：日期选择器

   <h2>效果图如下：</h2>    <p style="text-align:center"><img src="https://simg.open-open.com/show/9af840f3abf25559144a22f484da6fff.gif"></p>    <h2>用法</h2>    <pre>  <code class="language-objectivec">// 一： 初始化 默认height 150；    BLDatePickerView *datePickerView = [[BLDatePickerView alloc] init];    // 二：显示    [datePickerView bl_show];    // 三：回调选择结果  // 选择结果2种回调方式  // 1.block    datePickerView.sureButtonClickBlcok = ^(NSString *year, NSString *month, NSString *day){      };    // 2.delegate    datePickerView.pickViewDelegate = self;    - (void)bl_selectedDateResultWithYear:(NSString *)year                                  month:(NSString *)month                                    day:(NSString *)day{                                      };</code></pre>    <h2>如果你需要设置默认日期</h2>    <pre>  <code class="language-objectivec">/** 设置默认日期 */  - (void)bl_setUpDefaultDateWithYear:(NSInteger)year                                month:(NSInteger)month                                  day:(NSInteger)day;</code></pre>    <h2>如果你需要修改默写效果</h2>    <pre>  <code class="language-objectivec">/** 标题大小 */  @property (nonatomic, strong)UIFont  *titleFont;  /** 选择器背景颜色 */  @property (nonatomic, strong)UIColor *pickViewBackgroundColor;  /** 选择器头部视图颜色 */  @property (nonatomic, strong)UIColor *topViewBackgroundColor;  /** 取消按钮颜色 */  @property (nonatomic, strong)UIColor *cancelButtonColor;  /** 确定按钮颜色 */  @property (nonatomic, strong)UIColor *sureButtonColor;  /** 设置背景透明度 0~1 */  @property (nonatomic, assign)CGFloat backGAlpha;</code></pre>    <p> </p>