IOS-OC之高级组件PickerView之二

来源：互联网发布：存货管理的数据编辑：程序博客网时间：2024/06/05 14:53

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 == 0){        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 == 0){        NSString *selectedCol1 = [self.pickerData1 objectAtIndex:row];        NSArray *array = [self.data objectForKey:selectedCol1];        self.pickerData2 = array;        [self.pv reloadComponent:1];    }}//返回两个轮的数据数量-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{    if(component == 0){        return [self.pickerData1 count];    }else{        return [self.pickerData2 count];    }}//返回拾取器的轮数-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{    return 2;}//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:0];    //第二个轮的行数    NSInteger row2 = [_pv selectedRowInComponent:1];    //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: 0];    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：
文件名称
plist文件内容

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~~

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