ios - UIPickerView 未从 viewDidAppear 加载

Question

我有一个 UIPickerview，我最初是从 viewDidLoad 设置的。它工作得很好。

但我希望每次我从另一个 View 返回时它都能刷新，所以我放入了 viewDidAppear

- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];


    NSLog(@"View will appear");
    [self loadthepicker];

}


-(void) loadthepicker
{

    pickerLoaderArray=[[NSMutableArray alloc] init];
    [pickerLoaderArray addObject:@"one"];
    [pickerLoaderArray addObject:@"two"];
    [pickerLoaderArray addObject:@"thee"];
    [pickerLoaderArray addObject:@"four"];

    [pickerView selectRow:0 inComponent:0 animated:NO];

}



-(NSInteger)numberOfComponentsInPickerView:(NSInteger)component
{

    return 1;

}


-(NSInteger)pickerView:(UIPickerView *)picker numberOfRowsInComponent:(NSInteger)component
{

    return [pickerLoaderArray count];

}



-(NSString *)pickerView:(UIPickerView *)picker titleForRow:(NSInteger)row forComponent:(NSInteger)component{

    return [pickerLoaderArray objectAtIndex:row];
}

好吧，我想我可能已经找到答案了:

[pickerView reloadAllComponents];

我将其添加到 loadthepicker 函数中，现在工作正常。

这是正确的方法吗？

Answer 1

你必须打电话

[pickerView reloadAllComponents];