如何使用 UITextFields 在同一视图控制器中使用多个 UIPickerView
How to use Multiple UIPickerViews in same View controller using UITextFields
我正在尝试在 Objective-C 的一个视图中包含多个选择器视图。到目前为止，我已经创建了 3 个不同的文本字段，如果我单击它们，我希望其中三个具有不同的选择器视图。所以让我们说如果点击文本字段 #1 它打开数组 #1 和文本字段 #2 第二个和文本字段 # 第三个。如果我单击第一个和第二个文本字段相关的选择器视图显示，但如果我单击第三个选择器视图不显示。
-(void)viewDidLoad{
isBloodGroupFieldSelected = 是；
isGenderGroupFieldSelected = 是；
// 加载视图后执行任何其他设置。
bloodGroup = [[UITextField alloc]initWithFrame:CGRectMake(10, 100, self.view.frame.size.width-10,30)];
[self.view addSubview:bloodGroup];
txtField1 = [[UITextField alloc]initWithFrame:CGRectMake(10, 160, self.view.frame.size.width-10,30)];
txtField1.delegate = 自己；
[self.view addSubview:txtField1];
txtField2 = [[UITextField alloc]initWithFrame:CGRectMake(10, 210, self.view.frame.size.width-10,30)];
txtField2.delegate = 自己；
[self.view addSubview:txtField2];
dataArray = [[NSMutableArray alloc]initWithObjects:@"A+",@"A-",@"B+",@"B-",@"O+",@"O-", nil];
genderArray = [[NSMutableArray alloc]initWithObjects:@"Male",@"Female", nil];
ageArray = [[NSMutableArray alloc]initWithObjects:@"Age1",@"Age2", nil];
myPickerView = [[UIPickerView 分配] 初始化];
[myPickerView setDataSource: self];
[myPickerView setDelegate: self];
myPickerView.showsSelectionIndicator = 是；
UIBarButtonItem *doneButton = [[UIBarButtonItem alloc]initWithTitle:@"完成" style:UIBarButtonItemStyleDone
target:self 动作：@选择器（完成:)];
UIToolbar *toolBar = [[UIToolbar alloc]initWithFrame:CGRectMake(0, self.view.frame.size.height-
myPickerView.frame.size.height-50, 320, 50)];
[工具栏setBarStyle:UIBarStyleBlackOpaque];
NSArray *toolbarItems = [NSArray arrayWithObjects:doneButton, nil];
[工具栏setItems:toolbarItems];
bloodGroup.inputView = myPickerView;
bloodGroup.inputAccessoryView = 工具栏；
// txtField1
txtField1.inputView = myPickerView;
txtField1.inputAccessoryView = 工具栏;
txtField2.inputView = myPickerView;
txtField2.inputAccessoryView = 工具栏；
}
-(void)完成:(id)发件人{
[bloodGroup resignFirstResponder];
[txtField1 resignFirstResponder];
[txtField2 resignFirstResponder];
}
pragma 标记 - UIPickerViewDataSource
// #3
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
if (isBloodGroupFieldSelected) {
return1;
}
否则如果(!isBloodGroupFieldSelected){
return1;
}
else if(!isGenderGroupFieldSelected){
return1;
}
return 0;
}
-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
if (isBloodGroupFieldSelected) {
return [dataArray 计数];
}
else if(!isBloodGroupFieldSelected)
{
return [genderArray 计数];
}
else if(!isGenderGroupFieldSelected)
{
return [ageArray 计数];
}
return 0;
}
pragma 标记 - UIPickerViewDelegate
// #5
-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
if (isBloodGroupFieldSelected) {
return 数据数组[行];
}
else if(!isBloodGroupFieldSelected)
{
return 性别数组[行];
}
else if(!isGenderGroupFieldSelected)
{
return ageArray[行];
}
return 0;
}
// #6
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
if (isBloodGroupFieldSelected) {
bloodGroup.text = 数据数组[行];
}
else if(!isBloodGroupFieldSelected)
{
txtField1.text = genderArray[行];
}
else if(!isGenderGroupFieldSelected)
{
txtField2.text=年龄数组[行];
}
}
- (void)textFieldDidBeginEditing:(UITextField *)textField {
if (textField == bloodGroup) {
isBloodGroupFieldSelected = 是；
}
else if (textField == txtField1){
isBloodGroupFieldSelected = 否；
isGenderGroupFieldSelected = 是；
}
else if (textField == txtField2){
isGenderGroupFieldSelected = 否；
isBloodGroupFieldSelected = 否；
}
[myPickerView reloadAllComponents];
}
问题出在您在 titleForRow 方法中的编码。一旦将 false 分配给 isBloodGroupFieldSelected 方法，那么指针总是移动到 else 部分，因为在移动到最后一个块之前那里的条件匹配。
为此，您需要检查两个条件
(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
if (isBloodGroupFieldSelected) {
return dataArray[row];
}
else if(!isBloodGroupFieldSelected) && isGenderGroupFieldSelected
{
return genderArray[row];
}
else if(!isGenderGroupFieldSelected)
{
return ageArray[row];
}
return 0;
}
我建议您为此使用 textField 标记。这对你来说会更容易。
我正在尝试在 Objective-C 的一个视图中包含多个选择器视图。到目前为止，我已经创建了 3 个不同的文本字段，如果我单击它们，我希望其中三个具有不同的选择器视图。所以让我们说如果点击文本字段 #1 它打开数组 #1 和文本字段 #2 第二个和文本字段 # 第三个。如果我单击第一个和第二个文本字段相关的选择器视图显示，但如果我单击第三个选择器视图不显示。
-(void)viewDidLoad{
isBloodGroupFieldSelected = 是；
isGenderGroupFieldSelected = 是；
// 加载视图后执行任何其他设置。
bloodGroup = [[UITextField alloc]initWithFrame:CGRectMake(10, 100, self.view.frame.size.width-10,30)];
[self.view addSubview:bloodGroup];
txtField1 = [[UITextField alloc]initWithFrame:CGRectMake(10, 160, self.view.frame.size.width-10,30)];
txtField1.delegate = 自己；
[self.view addSubview:txtField1];
txtField2 = [[UITextField alloc]initWithFrame:CGRectMake(10, 210, self.view.frame.size.width-10,30)];
txtField2.delegate = 自己；
[self.view addSubview:txtField2];
dataArray = [[NSMutableArray alloc]initWithObjects:@"A+",@"A-",@"B+",@"B-",@"O+",@"O-", nil];
genderArray = [[NSMutableArray alloc]initWithObjects:@"Male",@"Female", nil];
ageArray = [[NSMutableArray alloc]initWithObjects:@"Age1",@"Age2", nil];
myPickerView = [[UIPickerView 分配] 初始化];
[myPickerView setDataSource: self];
[myPickerView setDelegate: self];
myPickerView.showsSelectionIndicator = 是；
UIBarButtonItem *doneButton = [[UIBarButtonItem alloc]initWithTitle:@"完成" style:UIBarButtonItemStyleDone target:self 动作：@选择器（完成:)];
UIToolbar *toolBar = [[UIToolbar alloc]initWithFrame:CGRectMake(0, self.view.frame.size.height- myPickerView.frame.size.height-50, 320, 50)];
[工具栏setBarStyle:UIBarStyleBlackOpaque];
NSArray *toolbarItems = [NSArray arrayWithObjects:doneButton, nil];
[工具栏setItems:toolbarItems];
bloodGroup.inputView = myPickerView;
bloodGroup.inputAccessoryView = 工具栏；
// txtField1
txtField1.inputView = myPickerView;
txtField1.inputAccessoryView = 工具栏;
txtField2.inputView = myPickerView;
txtField2.inputAccessoryView = 工具栏；
}
-(void)完成:(id)发件人{
[bloodGroup resignFirstResponder];
[txtField1 resignFirstResponder];
[txtField2 resignFirstResponder];
}
pragma 标记 - UIPickerViewDataSource
// #3 -(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
if (isBloodGroupFieldSelected) {
return1;
}
否则如果(!isBloodGroupFieldSelected){
return1;
}
else if(!isGenderGroupFieldSelected){
return1;
}
return 0;
}
-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
if (isBloodGroupFieldSelected) {
return [dataArray 计数];
}
else if(!isBloodGroupFieldSelected)
{
return [genderArray 计数];
}
else if(!isGenderGroupFieldSelected)
{
return [ageArray 计数];
}
return 0;
}
pragma 标记 - UIPickerViewDelegate
// #5 -(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
if (isBloodGroupFieldSelected) {
return 数据数组[行];
}
else if(!isBloodGroupFieldSelected)
{
return 性别数组[行];
}
else if(!isGenderGroupFieldSelected)
{
return ageArray[行];
}
return 0;
}
// #6 -(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
if (isBloodGroupFieldSelected) {
bloodGroup.text = 数据数组[行];
}
else if(!isBloodGroupFieldSelected)
{
txtField1.text = genderArray[行];
}
else if(!isGenderGroupFieldSelected)
{
txtField2.text=年龄数组[行];
}
}
- (void)textFieldDidBeginEditing:(UITextField *)textField {
if (textField == bloodGroup) {
isBloodGroupFieldSelected = 是；
}
else if (textField == txtField1){
isBloodGroupFieldSelected = 否；
isGenderGroupFieldSelected = 是；
}
else if (textField == txtField2){
isGenderGroupFieldSelected = 否；
isBloodGroupFieldSelected = 否；
}
[myPickerView reloadAllComponents];
}
问题出在您在 titleForRow 方法中的编码。一旦将 false 分配给 isBloodGroupFieldSelected 方法，那么指针总是移动到 else 部分，因为在移动到最后一个块之前那里的条件匹配。
为此，您需要检查两个条件
(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
if (isBloodGroupFieldSelected) {
return dataArray[row];
}
else if(!isBloodGroupFieldSelected) && isGenderGroupFieldSelected
{
return genderArray[row];
}
else if(!isGenderGroupFieldSelected)
{
return ageArray[row];
}
return 0;
}
我建议您为此使用 textField 标记。这对你来说会更容易。