[英]How to use Multiple UIPickerViews in same View controller using UITextFields
我試圖在 Objective-C 的一個視圖中擁有多個選擇器視圖。 到目前為止,我已經創建了 3 個不同的文本字段,如果我單擊它們,我希望其中三個具有不同的選擇器視圖。 所以讓我們說如果單擊文本字段#1,它將打開數組#1,文本字段#2 第二個和文本字段#第三個。 如果我單擊第一個和第二個文本字段相關的選擇器視圖顯示,但如果我單擊第三個選擇器視圖不顯示。
-(void)viewDidLoad{
isBloodGroupFieldSelected = YES;
isGenderGroupFieldSelected = YES;
// 加載視圖后做任何額外的設置。
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 = self;
[self.view addSubview:txtField1];
txtField2 = [[UITextField alloc]initWithFrame:CGRectMake(10, 210, self.view.frame.size.width-10,30)];
txtField2.delegate = self;
[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 alloc] init];
[myPickerView setDataSource: self];
[myPickerView setDelegate: self];
myPickerView.showsSelectionIndicator = 是;
UIBarButtonItem *doneButton = [[UIBarButtonItem alloc]initWithTitle:@"Done" style:UIBarButtonItemStyleDone target:self action:@selector(done:)];
UIToolbar *toolBar = [[UIToolbar alloc]initWithFrame:CGRectMake(0, self.view.frame.size.height-myPickerView.frame.size.height-50, 320, 50)];
[工具欄 setBarStyle:UIBarStyleBlackOpaque];
NSArray *toolbarItems = [NSArray arrayWithObjects:doneButton, nil];
[工具欄設置項目:工具欄項目];
bloodGroup.inputView = myPickerView;
bloodGroup.inputAccessoryView = 工具欄;
// txtField1
txtField1.inputView = myPickerView;
txtField1.inputAccessoryView = 工具欄;
txtField2.inputView = myPickerView;
txtField2.inputAccessoryView = 工具欄;
}
-(無效)完成:(id)發件人{
[血組辭職FirstResponder];
[txtField1 resignFirstResponder];
[txtField2 resignFirstResponder];
}
// #3 -(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
if (isBloodGroupFieldSelected) {
返回 1;
}
否則如果(!isBloodGroupFieldSelected){
返回 1;
}
否則如果(!isGenderGroupFieldSelected){
返回 1;
}
返回0;
}
-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
if (isBloodGroupFieldSelected) {
返回[數據數組計數];
}
否則如果(!isBloodGroupFieldSelected)
{
返回[性別數組計數];
}
否則如果(!isGenderGroupFieldSelected)
{
返回[年齡數組計數];
}
返回0;
}
// #5 -(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
if (isBloodGroupFieldSelected) {
返回數據數組[行];
}
否則如果(!isBloodGroupFieldSelected)
{
返回性別數組[行];
}
否則如果(!isGenderGroupFieldSelected)
{
返回年齡數組[行];
}
返回0;
}
// #6 -(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
if (isBloodGroupFieldSelected) {
bloodGroup.text = dataArray[行];
}
否則如果(!isBloodGroupFieldSelected)
{
txtField1.text = 性別數組[行];
}
否則如果(!isGenderGroupFieldSelected)
{
txtField2.text=ageArray[row];
}
}
if (textField == bloodGroup) {
isBloodGroupFieldSelected = YES;
}
否則 if (textField == txtField1){
isBloodGroupFieldSelected = 否;
isGenderGroupFieldSelected = YES;
}
否則 if (textField == txtField2){
isGenderGroupFieldSelected = 否;
isBloodGroupFieldSelected = 否;
}
[myPickerView 重新加載所有組件];
}
這里的問題在於您在 titleForRow 方法中的代碼。 一旦將 false 分配給 isBloodGroupFieldSelected 方法,則指針總是移動到 else 部分,因為在移動到最后一個塊之前條件在那里匹配。
為此,您需要檢查這兩個條件
(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;
}
我建議您為此使用 textField 標記。 這對你來說會更容易。
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