UIPickerView 多级联动

UIPickerView的多级联动问题有些地方需要注意，其实多级联动并不难。。。楼主因为项目需要又没法使用网上的第三方，所以最近写了一个省市区多级联动，还是手写代码好！！

为了演示效果，我会多定义几个属性，表现演示效果

@interface newTeamSettingController()<UIPickerViewDataSource,UIPickerViewDelegate>

@property(strong,nonatomic)NSString* strWeek;//记录周数

@property(strong,nonatomic)NSString* strTime;//记录时辰

@property(strong,nonatomic)NSArray* timeArray;//数组保存

@property(strong,nonatomic)UITextField* timeField;

@end

初始化，使textField一开始显示数据

- (void)viewDidLoad {

//初始化timeArray

    NSArray* weekArray=@[@"周一",@"周二",@"周三",@"周四",@"周五",@"周六",@"周日"];

    NSArray* shijianArray=@[@"上午",@"下午",@"晚上"];

    self.timeArray=[NSArray arrayWithObjects:weekArray,shijianArray, nil];

 //请选择的时间textField

    self.timeField=[[UITextField alloc]initWithFrame:CGRectMake(*luScaleW, *luScaleH, *luScaleW, *luScaleH)];

    self.timeField.tag=;

    self.timeField.placeholder=@"请选择";

    self.timeField.textAlignment=NSTextAlignmentRight;

    self.timeField.adjustsFontSizeToFitWidth=YES;

    self.strWeek=[NSString stringWithFormat:@"%@",self.timeArray[][]];

    self.strTime=[NSString stringWithFormat:@"%@",self.timeArray[][]];

    [self.chuZhenView addSubview:self.timeField];

    //timePickerView

    self.timePickerView=[[UIPickerView alloc]initWithFrame:CGRectMake(, CGRectGetMaxY(self.timeField.frame), LuW, )];

    self.timePickerView.tag=;

    self.timePickerView.dataSource=self;

    self.timePickerView.delegate=self;

    self.timeField.delegate=self;

    self.timeField.inputView=self.timePickerView;

    //在这里设置下方数据刷新部分的初始显示

    for (int component = ; component<self.timeArray.count; component++) {

           [self pickerView:nil didSelectRow: inComponent:component];

      }

     [self pickerView:nil didSelectRow: inComponent:];

    self.doneBtn=[[UIToolbar alloc]initWithFrame:CGRectMake(, , LuW, )];

    UIBarButtonItem * button1 =[[UIBarButtonItem  alloc]initWithBarButtonSystemItem:                                        UIBarButtonSystemItemFlexibleSpace target:self action:nil];

    UIBarButtonItem* rightBtn=[[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(doneClick)];

    self.doneBtn.items=[NSArray arrayWithObjects:button1,rightBtn, nil];

    self.timeField.inputAccessoryView=self.doneBtn;

}

UIPickerView的代理方法

-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView

{

    return self.timeArray.count;

}

//每列对应多少行

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

{

   NSArray* arryM=self.timeArray[component];

        return arryM.count;

}

//每行对应显示的数据是什么

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

{

  NSArray* arrayM=self.timeArray[component];

        NSString* name=arrayM[row];

        return name;

}

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

{

  if (component==) {

            [pickerView reloadComponent:];

            [pickerView selectRow: inComponent: animated:YES];

            _strWeek=self.timeArray[component][row];

            _strTime=self.timeArray[][];

        }

        else

        {

            _strTime=self.timeArray[component][row];

        }

        self.timeField.text=[NSString stringWithFormat:@"%@ %@",_strWeek,_strTime];

}

完成。