如何在Picker View iOS中设置文本对齐方式

问题描述：

我需要在选择器视图中设置文本的对齐方式，但是我的解决方案不起作用. 到目前为止，这是我的代码.我使用数组将值存储在选择器视图上.

I need to set the alignment of the text in picker view but my solutions doesn't work. This is my code so far. I used array to store values on the picker view.

- (void)viewDidLoad{

[super viewDidLoad];

self.source = [[NSMutableArray alloc]
               initWithObjects:@"  5   Minutes", @"10   Minutes", @"15   Minutes", @"20   Minutes",@"25   Minutes",@"30   Minutes",@"35   Minutes",@"40   Minutes",@"45   Minutes",@"50   Minutes",@"55   Minutes",@"60   Minutes", nil];

self.picker = [[UIPickerView alloc] initWithFrame:CGRectMake(0.0, 275.0, 320.0, 120.0)];


self.picker.delegate = self;
self.picker.dataSource = self;

[self.view addSubview:self.picker];
[self.picker selectRow:2 inComponent:0 animated:YES];}

然后

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
return [source objectAtIndex:row];
}

- (NSInteger)numberOfComponentsInPickerView:
(UIPickerView *)pickerView
{
 return 1;
}

- (NSInteger)pickerView:(UIPickerView *)pickerView
numberOfRowsInComponent:(NSInteger)component
{
return [source count];
}

但是，当显示值时，它可以正常工作.但是，当我将文本居中对齐时，而不是显示文本(选择器视图中的值)，选择器视图变为空.这是我如何在中心对齐的代码.

However, it works fine when it displays the values. But when I align the text at the center, instead of displaying the text(values on picker view), the picker view becomes empty. This is the code on how I've done the alignment at the center.

- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component 
reusingView:(UIView *)view
{
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 300, 37)];
 //label.text = [NSString stringWithFormat:@"something here"];
label.textAlignment = UITextAlignmentCenter;
label.backgroundColor = [UIColor clearColor];
return label;
}

这可能是什么解决方案? 关于这个问题，请帮助我.

What might be the solution for this? Please help me regarding this problem.

谢谢.

答

我用这段UIlabel文本代码在tableView的中心显示，如:-

i done with this code for UIlabel text show in center of tableView like:-

- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view
{
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 300, 37)];

        if (component == 0) {

            label.font=[UIFont boldSystemFontOfSize:22];
            label.textAlignment = UITextAlignmentCenter;
            label.backgroundColor = [UIColor clearColor];

        label.text = [NSString stringWithFormat:@"%@", [source objectAtIndex:row]];
        label.font=[UIFont boldSystemFontOfSize:22];

        }
    [label autorelease];
    return label;
 }

代码输出为

如何在Picker View iOS中设置文本对齐方式

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