Question

我对Xcode比较陌生，我需要一些帮助。因此，我的视图有2个按钮（它有更多的按钮，但为简单起见，比方说2），它们都连接到一个IBAction。按下每个按钮时，Picker会显示加载数组，具体取决于按下哪个按钮。我希望按钮的标题与用户在PickerView中选择的内容相匹配。

我知道我必须修改pickerView:didSelectRow方法中的一些代码，但我不知道该怎么做。它现在的工作方式是无论我点击哪个按钮（我应该注意正确的数组加载，以便该部分正常工作），带有标记“0”的按钮会被所选择的Picker行的内容修改。所以我需要修改SELECTED标签上的按钮。

我的头文件是：

@interface XYZSecondViewController : UIViewController <UITextFieldDelegate,   UIPickerViewDataSource, UIPickerViewDelegate>

@property (strong, nonatomic) IBOutlet UIPickerView *myPicker;
@property (strong, nonatomic) IBOutlet UIButton *myButton;

- (IBAction)myButton:(id)sender;

@end

我的实施档案：

#import "XYZSecondViewController.h"
@interface XYZSecondViewController ()
  @property (strong,nonatomic) NSArray *myArray1;
  @property (strong,nonatomic) NSArray *myArray2;
  @property (strong,nonatomic) NSArray *chosenArray;
@end

@implementation XYZSecondViewController
@synthesize myButton, myPicker;

- (IBAction)myButton:(id)sender
{
    switch ([sender tag])
    {
        case 0:
            self.chosenArray = self.myArray1;
            break;
        case 1:
            self.chosenArray = self.myArray2;
            break;
    }
    [self.myPicker reloadAllComponents];
}

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

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:  (NSInteger)component
{
      [myButton setTitle:[chosenArray objectAtIndex:row] forState:UIControlStateNormal];
}

Answer 1

您可以跟踪当前点按的按钮的标记。

这样的事情：

@property (nonatomic) NSInteger tagLastTappedButton;

...

- (IBAction)myButton:(id)sender
{
    tagLastTappedButton = sender.tag;
    ...
}

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:  (NSInteger)component
{
      UIButton *buttonTapped = (UIButton *)[self.view viewWithTag:tagLastTappedButton];
     [buttonTapped setTitle:[chosenArray objectAtIndex:row] forState:UIControlStateNormal];
}

Answer 2

在标题中取一个整数：

int flag;

修改你的开关案例：

switch ([sender tag])
    {
        case 0:
            self.chosenArray = self.myArray1;
            flag=0;
            break;
        case 1:
            self.chosenArray = self.myArray2;
            flag=1;
            break;
    }

并在didSelectRow中制作IF语句，如：

if (flag==0) {
    [myButton1 setTitle:[chosenArray objectAtIndex:row] forState:UIControlStateNormal];
}else{
    [myButton2 setTitle:[chosenArray objectAtIndex:row] forState:UIControlStateNormal];
}

根据标签更改特定命令按钮的标题

2 个答案: