1
我找到的每个示例都向我展示了如何在viewDidLoad
中填充UIPickerView
。但是,当我尝试在另一个函数中使用来自HTTP请求的项目填充选择器时,它最终变为空白(尽管我已经测试过数据实际上会按照我的需要返回)。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
是在故事板本身产生的,所以它不添加程序或任何东西。我添加到阵列courseArray
,这是在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
在这一点?
'_coursePicker.hidden = NO //而不是false' –