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(470*luScaleW, 30*luScaleH, 192*luScaleW, 30*luScaleH)];
    self.timeField.tag=1;
    self.timeField.placeholder=@"请选择";
    self.timeField.textAlignment=NSTextAlignmentRight;
    self.timeField.adjustsFontSizeToFitWidth=YES;
    self.strWeek=[NSString stringWithFormat:@"%@",self.timeArray[0][0]];
    self.strTime=[NSString stringWithFormat:@"%@",self.timeArray[1][0]];
    [self.chuZhenView addSubview:self.timeField];
    //timePickerView
    self.timePickerView=[[UIPickerView alloc]initWithFrame:CGRectMake(0, CGRectGetMaxY(self.timeField.frame), LuW, 60)];
    self.timePickerView.tag=1;
    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 = 0; component<self.timeArray.count; component++) {
           [self pickerView:nil didSelectRow:0 inComponent:component];
      }
     [self pickerView:nil didSelectRow:0 inComponent:0];
    self.doneBtn=[[UIToolbar alloc]initWithFrame:CGRectMake(0, 0, LuW, 44)];
    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==0) {
            [pickerView reloadComponent:1];
            [pickerView selectRow:0 inComponent:1 animated:YES];
            _strWeek=self.timeArray[component][row];
            _strTime=self.timeArray[1][0];
        }
        else
        {
            _strTime=self.timeArray[component][row];
        }
        self.timeField.text=[NSString stringWithFormat:@"%@ %@",_strWeek,_strTime];
}

完成。