在UIAcitionSheet中添加UIPickerView

首先来看下一下效果图，如下：

在这里，使用到了系统自带的UIActionSheet，熟悉iOS开发的人应该都知道。UIActionSheet是一个底部弹出的选择按钮项控件，可以添加多项，并为每项添加点击事件。它的初始化代码为：

 

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NSString *title = UIDeviceOrientationIsLandscape([UIDevice currentDevice].orientation) ? @                ; UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:title                                                           delegate:self                                                  cancelButtonTitle:@取消                                             destructiveButtonTitle:nil                                                  otherButtonTitles:@确定,nil];

我们可以看到这里初始化了一个NSString,然后根据屏幕的横竖屏选择使用三目运算符指定填充字符串。这里只用字符 换行符作为字符使得UIActionSheet的顶部出现一段空的布局以提供UIDatePicker和UIPickerView使用。

 

 

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actionSheet.userInteractionEnabled = YES; actionSheet.backgroundColor = [UIColor clearColor]; datePicker = [[UIDatePicker alloc] init]; datePicker.tag = 1000 ; datePicker.datePickerMode = UIDatePickerModeDate; [actionSheet addSubview:datePicker]; [actionSheet showInView:self.view]; actionSheet.tag = 100 ;

上述代码设置UIActionSheet可交互，背景为白色，必须设置背景色，否则可能部分机型会出现 显示字符。然后初始化UIDatePicker并绑定tag以提供后面方法调用。紧接着设置日期格式，当然也可以是指日期时间格式。最好通过UIActionSheet的addSubView方法添加到之前我们用换行符占位的布局上，并且使用showInView显示在最上面，同样给UIActionSheet设置一个tag值标记。

 

以上是添加日期选择器的实现。
同理 ，地区联动也是一样的实现。不过相对比较复杂。这里不做详细介绍了。直接贴出实现部分。

plist文件就是普通的国内各省市，直辖市区县的信息，目前并不是很完善，本人地理知识有限，需要不断优化添加。

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#pragma mark - 调用地区联动方法 - ( void )showAreaPickerView{      // 加载plist文件，初始化三个NSArray对象，然后做一些非法的事情，你懂的      provinces = [[NSArray alloc] initWithContentsOfFile:[[NSBundle mainBundle] pathForResource: @area .plist ofType:nil]];      cities = [[provinces objectAtIndex: 0 ] objectForKey: @cities ];      state = [[provinces objectAtIndex: 0 ] objectForKey: @state ];      NSString *title = UIDeviceOrientationIsLandscape([UIDevice currentDevice].orientation) ? @                   : @                         ;      UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:title                                                               delegate:self                                                      cancelButtonTitle:@取消                                                 destructiveButtonTitle:nil                                                      otherButtonTitles:@确定,nil];      actionSheet.userInteractionEnabled = YES;      actionSheet.backgroundColor = [UIColor clearColor];      areaPicker = [[UIPickerView alloc] init];      areaPicker.dataSource = self;      areaPicker.delegate = self;            [actionSheet addSubview:areaPicker];      [actionSheet showInView:self.view];      actionSheet.tag = 200 ; }

接下来是UIPickerViewDataSource数据源方法和UIPickerViewDelegate代理方法。部分地方仍然可以精简。

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// UIPickerViewDataSource中定义的方法，该方法的返回值决定改控件包含多少列 - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {      return 3 ; // 返回3 表明什么呢？这个如果你不知道，你就别干了、、、表明该控件只包含3列，3列也就够了啊 } // UIPickerViewDataSource中定义的方法，该方法的返回值决定该控件指定列包含多少哥列表项 - (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {      // 如果是第一列，返回provinces的个数      // 也就是provinces包含多少个元素，大天朝有多少个省份里面就有多少个      if (component == 0 ) {          return provinces.count;      } else if (component == 1 ){          // 如果是第二列，返回cities的个数          return cities.count;      } else {          return areas.count;      } } // UIPickerViewDelegate中定义的方法，该方法返回NSString将作为UIPickerView中指定列和列表项上显示的标题 - (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {      // 如果是第一列，返回provinces中row索引出得元素      switch (component) {          case 0 :              return [[provinces objectAtIndex:row] objectForKey: @state ];              break ;          case 1 :              return [[cities objectAtIndex:row] objectForKey: @city ];              break ;          case 2 :              return [areas objectAtIndex:row];              break ;          default :              return @;              break ;      } } // 当用户选中UIPickerViewDataSource中指定列和列表项时激发该方法 - ( void )pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {      switch (component) {          case 0 :              cities = [[provinces objectAtIndex:row] objectForKey: @cities ];              [self.areaPicker selectRow: 0 inComponent: 1 animated:YES];              [self.areaPicker reloadComponent: 1 ];                            areas = [[cities objectAtIndex: 0 ] objectForKey: @areas ];              [self.areaPicker selectRow: 0 inComponent: 2 animated:YES];              [self.areaPicker reloadComponent: 2 ];                            state = [[provinces objectAtIndex:row] objectForKey: @state ];              city = [[cities objectAtIndex: 0 ] objectForKey: @city ];              if ([areas count] > 0 ) {                  district = [areas objectAtIndex: 0 ];              } else {                  district = @;              }              break ;          case 1 :              areas = [[cities objectAtIndex:row] objectForKey: @areas ];              [self.areaPicker selectRow: 0 inComponent: 2 animated:YES];              [self.areaPicker reloadComponent: 2 ];                            city = [[cities objectAtIndex:row] objectForKey: @city ];              if ([areas count] > 0 ) {                  district = [areas objectAtIndex: 0 ];              } else {                  district = @;              }              break ;          case 2 :              if ([areas count] > 0 ) {                  district = [areas objectAtIndex:row];              } else {                  district = @;              }              break ;      } }

具体逻辑实现可能有一些小细节处理的不好，但实际使用还是很棒的。这里就不贴动态gif图了。 本篇到此为止。