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标题: ios - 具有大量数值的 PickerView [打印本页]

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作者: 菜鸟教程小白    时间: 2022-12-12 21:46
标题: ios - 具有大量数值的 PickerView

我见过使用选择器 View 的示例，其中选择器的值像这样硬编码到源代码中

- (NSString *)pickerViewUIPickerView *)pickerView titleForRowNSInteger)row forComponentNSInteger)component {
    NSString * title = nil;
 switch(row) {
            case 0:
                title = @"a";
                break;
            case 1:
                title = @"b";
                break;
            case 2:
                title = @"c";
                break;
        }

但是，如果要在选择器 View 中显示 100 个数字，那将是非常不切实际的。我相信你可以在下面看到我想要做的事情。它给了我错误

expression is not an integer constant expression

如何在选择器 View 中获取 0 到 100 的数字？如果有更好的方法来获取用户选择 1 到 100 之间的数字的输入，请随时发表评论。

- (NSString *)pickerViewUIPickerView *)pickerView titleForRowNSInteger)row forComponentNSInteger)component {
    NSString * title = nil;

    if (pickerView.tag == 1) // this is otherPickerview
    {
        otherpickerview
        for (int i = 2; i < 100; i++){
            switch(row) {
                case i:
                    title = [NSString stringWithFormat"%d", i];
                    break;

            }


        }

    }

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Best Answer-推荐答案

让我们试试吧:

- (NSInteger)numberOfComponentsInPickerViewUIPickerView *)pickerView
{
return 3;
}

- (NSInteger)pickerViewUIPickerView *)pickerView numberOfRowsInComponentNSInteger)component
{
return _arr.count;
}

- (NSString *)pickerViewUIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
// you can switch to other UIPickerView, and return title for row which you want.
// don't need to loop whenever titleForRow is called.
return _arr[row];
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[self.navigationController setNavigationBarHidden:YES];

_arr = [[NSMutableArray alloc]init];
for (int i = 0; i<100; i++) {
    NSString *str = [NSString stringWithFormat"%d",i];
    [_arr addObject:str];
}
_pickerView.dataSource = self;
_pickerView.delegate = self;
}

关于ios - 具有大量数值的 PickerView，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/23190292/

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