ios - 如何在一个 View 中将一个 UIPickerView 用于两个文本字段？

Question

我在一个 View 中有 2 个文本字段。我想使用 pickerview 填充每个。目前，我已经成功地使一个带有一个文本字段的选择器工作得很好，但是一旦我编辑了代码以使其与两个文本字段一起工作，它就没有按预期工作。任何帮助将不胜感激。

下面是我的代码:

#import "TestPickerVC.h"

@interface TestPickerVC () <UITextFieldDelegate, UIPickerViewDataSource, UIPickerViewDelegate>
{
    NSArray *aktivitiArray;
    NSArray *penganjurArray;
}

@end

@implementation TestPickerVC

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.

    self.penganjurTextField.delegate = self;
    self.aktivitiTextField.delegate = self;

    aktivitiArray = @[@"apple", @"samsung", @"motorola", @"nokia"];
    penganjurArray = @[@"jimbit", @"ayam", @"kambing", @"emergency"];


//    self.aktivitiTextField.inputView = self.pickerView1;
//    self.penganjurTextField.inputView = self.pickerView2;

    self.pickerView = [[UIPickerView alloc] init];
    self.pickerView.delegate = self;
    self.pickerView.dataSource = self;


    self.aktivitiTextField.inputView = self.pickerView;

    self.penganjurTextField.inputView = self.pickerView;

    self.aktivitiTextField.tag = 1;
    self.penganjurTextField.tag = 2;



//    if (self.aktivitiTextField.tag == 100) {
//        self.aktivitiTextField.inputView = self.pickerView;
//        self.pickerView.tag = 1;
//        NSLog(@"pickerview tag : %d", (int)self.pickerView.tag);
//    } else if (self.penganjurTextField.tag == 200) {
//        self.penganjurTextField.inputView = self.pickerView;
//        self.pickerView2.tag = 2;
//        NSLog(@"pickerview tag : %d", (int)self.pickerView2.tag);
//
//    }

}

#pragma mark - UIPickerView DataSource

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

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {

    if (self.aktivitiTextField.tag == 1) {

        return aktivitiArray.count;

    } else if (self.penganjurTextField.tag == 2) {

        return penganjurArray.count;
    }

    return 1;

}

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {

    if (self.aktivitiTextField.tag == 1) {
        return aktivitiArray[row];
    } else if (self.penganjurTextField.tag == 2) {
        return penganjurArray[row];
    }

    return @"";
}

#pragma mark - UIPickerView Delegate

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {

    NSString *selectedAktivitiRow = aktivitiArray[row];
    NSString *selectedPenganjurRow = penganjurArray[row];


    if (self.aktivitiTextField.tag == 1) {
        self.aktivitiTextField.text = selectedAktivitiRow;
    } else if (self.penganjurTextField.tag == 2) {
        self.penganjurTextField.text = selectedPenganjurRow;
    }

}




-(BOOL) textFieldShouldReturn:(UITextField *)textField{

    [textField resignFirstResponder];
    return YES;
}
/*
 #pragma mark - Navigation

 // In a storyboard-based application, you will often want to do a little preparation before navigation
 - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
 // Get the new view controller using [segue destinationViewController].
 // Pass the selected object to the new view controller.
 }
 */

@end

Answer 1

创建另一个私有(private)变量作为 selectedTextField。

@interface TestPickerVC () <UITextFieldDelegate, UIPickerViewDataSource, UIPickerViewDelegate>
{
    NSArray *aktivitiArray;
    NSArray *penganjurArray;
    int selectedTextField
}

当您点击文本字段时，文本字段委托(delegate)方法 textFieldDidBeginEditing 将被调用。在这个方法中，做 -

selectedTextField = textField.tag;

现在在选择器委托(delegate)方法中，检查这个条件:

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {

    if (selectedTextField == 1) {

        return aktivitiArray.count;

    } else if (selectedTextField == 2) {

        return penganjurArray.count;
    }

    return 1;

}
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {

    if (selectedTextField == 1) {
        return aktivitiArray[row];
    } else if (selectedTextField == 2) {
        return penganjurArray[row];
    }

    return @"";
}

对所有选择器委托(delegate)方法执行同样的操作。