IOS-OC之高级组件PickerView之二

第一篇写了简单的拾取器的展示和获取，这一篇是双轮拾取器的展示和获取，内容大致差不多，主要是双轮之间的联动~~~

代码：

.h的代码

#import <UIKit/UIKit.h>

//<UIPickerViewDelegate, UIPickerViewDataSource>是事件代理，和数据源代理，在.m文件中实现方法添加事件和数据源
@interface ViewController : UIViewController<UIPickerViewDataSource,UIPickerViewDelegate>
//数据字典
@property (nonatomic, strong)  NSDictionary *data;
//拾取器第一个轮的数据数组
@property (nonatomic, strong) NSArray *pickerData1;
//拾取器第二个轮的数据数组
@property (nonatomic, strong) NSArray *pickerData2;
//拾取器声明
@property (strong, nonatomic) IBOutlet UIPickerView *pv;
//显示拾取器的标签
@property (strong, nonatomic) IBOutlet UILabel *lable;
//点击按钮显示拾取器方法声明
-(IBAction)onClick:(id)sender;
@end
           

.m文件的代码

//实现协议UIPickerViewDelegate方法
-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{
    if(component == ){
        return [self.pickerData1 objectAtIndex:row];

    }else{
        return [self.pickerData2 objectAtIndex:row];
    }
}

//选择某一行时触发的事件，拾取器第二个轮的数据是和第一个轮关联的
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{
    if(component == ){
        NSString *selectedCol1 = [self.pickerData1 objectAtIndex:row];
        NSArray *array = [self.data objectForKey:selectedCol1];
        self.pickerData2 = array;
        [self.pv reloadComponent:];
    }
}
//返回两个轮的数据数量
-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{
    if(component == ){
        return [self.pickerData1 count];
    }else{
        return [self.pickerData2 count];
    }
}
//返回拾取器的轮数
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{
    return ;
}
//点击按钮显示当前拾取器的数据
-(IBAction)onClick:(id)sender{
    //第一个轮的行数
    NSInteger row1 = [_pv selectedRowInComponent:];
    //第二个轮的行数
    NSInteger row2 = [_pv selectedRowInComponent:];
    //第一个轮的值
    NSString * mys1 = [self.pickerData1 objectAtIndex:row1];
    //第二个轮的值
    NSString *mys2 = [self.pickerData2 objectAtIndex:row2];
    NSString *str = @"";
    //标签显示两个轮的拼接字符串
    _lable.text = [str stringByAppendingString:[NSString stringWithFormat:@"%@,%@",mys1,mys2]];

}

//初始化
- (void)viewDidLoad {
    [super viewDidLoad];

    //用NSBundle读取资源文件
    NSBundle *bundle = [NSBundle mainBundle];
    //statedictionary是资源文件的名字
    NSString *plistPath = [bundle pathForResource:@"statedictionary" ofType:@"plist"];
    NSDictionary *dict = [[NSDictionary alloc] initWithContentsOfFile:plistPath];
    self.data = dict;

    NSArray *col1 = [self.data allKeys];
    //排序
    NSArray *sorted = [col1 sortedArrayUsingSelector:@selector(compare:)];
    self.pickerData1 = sorted;
    //初始化第二个轮的数据
    NSString *selectedCol1 = [self.pickerData1 objectAtIndex: ];
    NSArray *col2 = [self.data objectForKey:selectedCol1];
    self.pickerData2 = col2;
    // Do any additional setup after loading the view, typically from a nib.
}
           

资源plist文件为：

nib文件

遇到的问题：

中途我改过一次UIPickerView的名称，然后报错了，233~

找了半天，发现改了名称之后要在nib文件中重新拖拽，让File’s Owner和新改的名称连接起来~~~

每次都会遇到问题，解决问题的过程就是我们成长的过程，加油~~