[ iOS ] PickView

Picker View

1. 拉到viewController上面後按右鍵
2. datasource , delegate 拉到viewController裡面
3. 拉到.m檔案裡面
4. .h 加上<UIPickViewDataSource,UIPickViewDelegate>
5. 開始寫code

code:

@implementation ViewController {
    
    __weak IBOutlet UIPickerView *picker;
    NSArray *items;
    
    NSInteger cityIndex;
    NSInteger priceIndex;
    NSInteger typeIndex;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    cityIndex = typeIndex = priceIndex = 0;
    
    
    NSArray *cities = @[@"台北市", @"台中市", @"高雄市", @"台北市", @"台中市", @"高雄市", @"台北市", @"台中市", @"高雄市", @"台北市", @"台中市", @"高雄市"];
    
    NSArray *prices = @[@"300~1000", @"1000~5000", @"5000以上"];
    
    NSArray *types = @[@"商務旅館", @"民宿", @"飯店", @"汽車旅館"];
    
    items = @[cities, prices, types];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{
    return items.count;
}
-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{
    return [items[component] count];
}
-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{
    
    return items[component][row];

}
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{
    if (component==0) {
        cityIndex = row;
    } else if (component ==1) {
        priceIndex = row;
    } else if (component ==2){
        typeIndex = row;
    }
    NSLog(@"縣市：%@ 價格：%@ 類型：%@", items[0][cityIndex], items[1][priceIndex], items[2][typeIndex]);
}
@end