Question

我有一个字符串mild,medium,hot。我用逗号分隔字符串作为分隔符。我也需要在pickerView中打印它。
我使用以下代码并将List计数成功3。

    NSString *spList=[mdict objectForKey:@"spicinesstype"];
    NSArray *list = [spList componentsSeparatedByString:@","];
    NSLog(@"List count:%d",[list count]);
    return [list count];

但是如何在pickerview中显示所有3个项目

Answer 1

您应该将您的类设置为选择器视图的委托，然后为您的选择器实现这3个委托方法

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

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

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

Answer 2

首先，你需要实现UIPickerViewDelegate和UIPickerViewDataSource，方法是将它们放在视图控制器头文件的@interface行的末尾。

像这样：@interface MyViewController : UIViewController <UIPickerViewDelegate, UIPickerViewDataSource>

接下来，您需要将视图控制器设置为选择器视图的委托和数据源。您可以通过添加以下行来在视图控制器的- (void)viewDidLoad方法中执行此操作：

myPickerView.delegate = self;
myPickerView.dataSource = self;

或者，如果您正在使用它，可以在Interface Builder中将其链接起来。

然后，您需要在View Controller源文件中实现这些委托方法。

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

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    // whatever you want to happen when a row is selected.
}

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

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

Iphone：拆分以逗号分隔的字符串，并在pickerview行中打印

2 个答案: