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好的，让我们再试一次，我的应用程序中有一个选择器，这里的代码可以正常工作

_fuglar = [[NSArray alloc]initWithObjects:@"Allt árið", @"Hrafn", @"Svartbakur",@"Silfurmáfur",@"Sílamáfur",@"Frá 20.ágúst til 15.mars",@"Grágæs",@"Heiðagæs",@"Frá 1.september til 15.mars",@"Fýll",@"Dílaskarfur", nil];
}

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

#pragma mark - UIPickerView Methods
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
return 1;
}

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
return _fuglar.count;
}

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
return [_fuglar objectAtIndex:row];
}
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
//Create UIImage objects
UIImage * uglaImage = [UIImage imageNamed:@"ugla1.jpg"];
UIImage * ravenImage = [UIImage imageNamed:@"raven.jpg"];
UIImage * svartbakurImage = [UIImage imageNamed:@"svartbakur2.jpg"];

然后我想将选择器中的文本居中并更改颜色，我正在使用此代码，但是我的选择器只是空白，但我可以看到图片，有什么想法吗？

- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view
{
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 300, 37)];
label.textAlignment = NSTextAlignmentCenter;
label.backgroundColor = [UIColor clearColor];
label.textColor = [UIColor blueColor];
return label;
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1 回答 1

2

填充选择器视图时，您实现 titleForRow 或 viewForRow，而不是两者。通过实现 viewForRow，您可以将视图替换为默认标签。要解决此问题，请删除 titleForRow 方法，并在 viewForRow 中设置标签文本：

- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view
{
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 300, 37)];
    label.textAlignment = NSTextAlignmentCenter;
    label.backgroundColor = [UIColor clearColor];
    if (row == 0 || row == 2) {
        label.textColor = [UIColor blueColor];
    }else{
        label.textColor = [UIColor blackColor];
    }
    label.text = [_fuglar objectAtIndex:row];
    return label;
}
于 2013-05-19T22:46:47.083 回答