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@implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; _item1 = [[NSArray alloc]initWithObjects:@"大类1",@"大类2", nil]; _item2 = [NSDictionary dictionaryWithObjectsAndKeys:@[@"子类11",@"子类12"],@"大类1",@[@"子类21",@"子类22"],@"大类2",nil]; _item3 = [NSDictionary dictionaryWithObjectsAndKeys:@[@"条目111",@"条目112"],@"子类11",@[@"条目121",@"条目122"], @"子类12",nil]; _pickview = [[UIPickerView alloc]init]; _pickview.dataSource = self; _pickview.delegate = self; _pickview.frame = CGRectMake(0, 10, 300, 100); _pickview.showsSelectionIndicator = YES; [self.view addSubview:_pickview]; } // UIPickerViewDataSource协议必须实现的方法 // 确认该控件有多少列 - (NSInteger)numberOfComponentsInPickerView:(UIPickerView*)pickerView { return 3; } //UIPickerViewDataSource协议必须实现的方法 //返回当前列显示的行数 -(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{ if(0 == component){ return _item1.count; }else if(1 == component){ NSInteger item1 = [_pickview selectedRowInComponent:0]; NSString *item1Name = _item1[item1]; NSArray *array = [_item2 valueForKey:item1Name]; return array.count; }else if(2 == component){ NSInteger item1 = [_pickview selectedRowInComponent:0]; NSString *item1Name = _item1[item1]; NSArray *array = _item2[item1Name]; NSInteger item2 = [_pickview selectedRowInComponent:1]; NSString *item2Name = array[item2]; NSArray *array2 = _item3[item2Name]; return array2.count; }else{ return 0; } } //UIPickerViewDelegate协议要求实现 //返回当前行的内容,此处是将数组中数值添加到滚动的那个显示栏上 -(NSString*)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component { if(0 == component){ return _item1[row]; }else if(1 == component){ NSInteger item1 = [_pickview selectedRowInComponent:0]; NSString *item1Name = _item1[item1]; NSArray *array = _item2[item1Name]; return array[row]; }else if(2 == component){ NSInteger item1 = [_pickview selectedRowInComponent:0]; NSString *item1Name = _item1[item1]; NSArray *array = _item2[item1Name]; NSInteger item2 = [_pickview selectedRowInComponent:1]; NSString *item2Name = array[item2]; NSArray *array2 = _item3[item2Name]; return array2[row]; }else{ return NULL; } } //获取选择的数据 //监听轮子的移动 - (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{ if(0 == component){ //重新加载第二列的数据 NSLog(@"%@", _item1[row]); [_pickview reloadComponent:1]; }else if(1 == component){ //重新加载第三列的数据 [_pickview reloadComponent:2]; NSInteger item1 = [_pickview selectedRowInComponent:0]; NSString *item1Name = _item1[item1]; NSArray *array = _item2[item1Name]; NSLog(@"%@", array[row]); }else if(2 == component){ NSInteger item1 = [_pickview selectedRowInComponent:0]; NSString *item1Name = _item1[item1]; NSArray *array = _item2[item1Name]; NSInteger item2 = [_pickview selectedRowInComponent:1]; NSString *item2Name = array[item2]; NSArray *array2 = _item3[item2Name]; NSLog(@"%@", array2[row]); } } //工具函数,遍历字典 -(void)describeDictionary:(NSDictionary *)dict { NSArray *keys; int i, count; id key, value; keys = [dict allKeys]; count = [keys count]; for (i = 0; i < count; i++) { key = [keys objectAtIndex: i]; value = [dict objectForKey: key]; NSLog (@"Key: %@ for value: %@", key, value); } } @end
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原文地址:http://www.cnblogs.com/Fredric-2013/p/5245612.html