我在一个视图中有2个文本字段。我想使用pickerview填充每个。目前我已经成功地制作了一个带有一个文本字段的选择器，但是一旦我编辑了代码以使其与两个文本字段一起工作，它就无法按预期工作。任何帮助将不胜感激。
以下是我的代码：
#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
答案 0 :(得分：2)
创建另一个私有变量作为selectedTextField。
@interface TestPickerVC () <UITextFieldDelegate, UIPickerViewDataSource, UIPickerViewDelegate>
{
NSArray *aktivitiArray;
NSArray *penganjurArray;
int selectedTextField
}
点击文本字段时，将调用文本字段委派方法textFieldDidBeginEditing。在这种方法中，做 -
selectedTextField = textField.tag;
现在在picker委托方法中，请检查以下条件：
- (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 @"";
}
同样适用于所有选择器委托方法。
答案 1 :(得分：1)
你没有真正解释你的问题是什么，但看看代码有一个非常明显的问题。我们来看一个方法作为例子：
- (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;
}
这里的问题是第一个if语句将始终为真。无论选择器用于哪个文本字段，self.aktivitiTextField.tag == 1始终为真。您在所有选择器视图方法中都遇到此问题。
您需要检查当前使用的文本字段。在所有选择器视图方法中尝试以下模式：
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
if ([self.aktivitiTextField isFirstResponder]) {
return aktivitiArray.count;
} else if ([self.penganjurTextField isFirstResponder]) {
return penganjurArray.count;
}
return 1;
}
答案 2 :(得分：1)
相反，您可以将.editing用于文本字段并返回相应的数组。 例如：
if (aktivitiTextField.editing) {
return aktivitiArray.count;
} else if (penganjurArray.editing) {
return penganjurArray.count;
}
答案 3 :(得分：0)
在swift 3中，这对我有用。以下是代码。
//MARK:- picker view methods
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
if (textFieldName .isEqual(to: "firstDoseFld")) {
return arrFirstDose.count
}
else
{
return arrFrequency.count
}
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
if (textFieldName .isEqual(to: "firstDoseFld")) {
return arrFirstDose[row]
} else {
return arrFrequency[row]
}
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
if (textFieldName .isEqual(to: "firstDoseFld"))
{
selectedFirstDose = NSString()
selectedFirstDose = arrFirstDose[row] as NSString!
let cell : AddMedicationCell = ordersTable.cellForRow(at: indexPathForCell as IndexPath) as! AddMedicationCell
cell.firstDoseFld.text = selectedFirstDose as String?
} else
{
selectedFrequency = NSString()
selectedFrequency = arrFrequency[row] as NSString!
let cell : AddMedicationCell = ordersTable.cellForRow(at: indexPathForCell as IndexPath) as! AddMedicationCell
cell.frequencyField.text = selectedFrequency as String?
}
}
在textfield委托方法中这样做
func textFieldShouldBeginEditing(_ textField: UITextField) -> Bool
{
print("textfield is ..\(textField)")
if textField.placeholder == "First Dose"
{
textFieldName = "firstDoseFld"
}
else if textField.placeholder == "Frequency"
{
textFieldName = "frequencyFld"
}
activeTextfield = textField
print(selectedTextField)
return true;
}
在cellForRowAtIndexPath中这样做（设置自定义单元格文本字段的委托）并在此处添加工具栏
orderCell.firstDoseFld.delegate = self
orderCell.frequencyField.delegate = self
let toolBar4 = UIToolbar()
toolBar4.barStyle = .default
toolBar4.isTranslucent = true
toolBar4.tintColor = UIColor(red: 92/255, green: 216/255, blue: 255/255, alpha: 1)
toolBar4.sizeToFit()
let doneButtonForFirstDoseFld = UIBarButtonItem(title: "Done", style: .plain, target: self, action: #selector(AddMedicationOrderVC.doneClickedForFirstDoseFld))
let spaceButton4 = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil)
// let cancelButton = UIBarButtonItem(title: "Cancel", style: .Plain, target: self, action: "cancelClick")
toolBar4.setItems([spaceButton4, doneButtonForFirstDoseFld], animated: false)
toolBar4.isUserInteractionEnabled = true
orderCell.firstDoseFld.inputView = pickerView
orderCell.firstDoseFld.inputAccessoryView = toolBar4
orderCell.firstDoseFld.tintColor = UIColor.clear
如果您需要更多信息，请与我们联系。 Delare变量基于对此的要求。