IOS中的各种Picker(2)

p>    [picker dismissViewControllerAnimated:YES completion:nil];  

p>}  

p> 

p> 

p>UIPickerView

p> 

p>在Component较多的时候，PickerView稍微要复杂一些。首先初始化和设置属性

p> 

p>[cpp]  

p>- (void)pickerViewAndMethod  

p>{  

p>    UIPickerView *pickerView = [[UIPickerView alloc] init];  

p>    pickerView.delegate = self;  

p>    pickerView.dataSource = self;  

p>    //显示选择活动器  

p>    pickerView.showsSelectionIndicator = YES;  

p>    _cityField.inputView = pickerView;  

p>    _cityField.text = @"北京 - 海淀";  

p>}  

p> 

p> 

p>实现数据源和代理方法，来刷新自身数据和界面。

p> 

p>[cpp] 

p>- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView  

p>{  

p>    return rComponentCount;  

p>}  

p>  

p>- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component  

p>{  

p>    if (component == rProvinceComponent)  

p>    {  

p>        return _cityList.count;  

p>    }  

p>    else  

p>    {  

p>        NSInteger i = [pickerView selectedRowInComponent:rProvinceComponent];  

p>        NSArray *arr = _cityList[i][@"city"];  

p>        return arr.count;  

p>    }  

p>}  

p>  

p>- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component  

p>{  

p>    if (component == rProvinceComponent)  

p>    {  

p>        NSString *proName = _cityList[row][@"province"];  

p>        return proName;  

p>    }  

p>    else  

p>    {  

p>        NSInteger i = [pickerView selectedRowInComponent:rProvinceComponent];  

p>        NSString *cityName = _cityList[i][@"city"][row];  

p>        return cityName;  

p>    }  

p>}  

p>  

p>- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component  

p>{  

p>    [pickerView reloadComponent:rCityComponent];  

p>      

p>    NSInteger proIndex = [pickerView selectedRowInComponent:rProvinceComponent];  

p>    NSString *proName = _cityList[proIndex][@"province"];  

p>      

p>    NSInteger cityIndex = [pickerView selectedRowInComponent:rCityComponent];