1
我找到的每個示例都向我展示瞭如何在viewDidLoad
中填充UIPickerView
。但是,當我嘗試在另一個函數中使用來自HTTP請求的項目填充選擇器時,它最終變爲空白(儘管我已經測試過數據實際上會按照我的需要返回)。添加到UIPickerView
- (IBAction)btnClick:(id)sender
{
NSDictionary *courseNames;
if(![_txtBox.text isEqual:@""]) //if not empty
{
courseNames = [self retrieveCourseNamesForSemester:_txtBox.text];
for (NSString *key in courseNames)
{
NSString *val = [NSString stringWithFormat:@"%@ - %@",key,[courseNames objectForKey:key]];
_txtView.text = val;
[courseArray addObject:val];
}
}
_coursePicker.hidden=false;
[_txtBox resignFirstResponder];
}
_coursePicker
是在故事板本身產生的,所以它不添加程序或任何東西。我添加到陣列courseArray
,這是在UIPickerView
方法分配如下:
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
return 1;
}
-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
//set number of rows
return courseArray.count;
}
-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
return [courseArray objectAtIndex:row];
}
如何重新填充UIPickerView
在這一點?
'_coursePicker.hidden = NO //而不是false' –