在文本字段內部點擊時如何添加UIPickerView？

Question

我有這個代碼來添加一個datepicker：

// Initiate datepicker and assign to due date
_datePicker = [[UIDatePicker alloc] init];
[_datePicker addTarget:self action:@selector(dateChanged:)
 forControlEvents:UIControlEventValueChanged];
_datePicker.minuteInterval = 15;
_dueDate.inputView = _datePicker;

我嘗試用pickerview做同樣的事情，但我沒有成功，有人可以解釋為什么嗎？

這是我的代碼：// Initaite pickerview並分配給優先級文本字段_priorityPickerView = [[UIPickerView alloc] initWithFrame：CGRectMake（0,200-320,200）];

// Array otions for priority picker
NSArray *array = [[NSArray alloc] initWithObjects:@"High",@"Medium",@"Low", nil];
self.priorityPickerData = array;

// Connect text field to pickerview
_priority.inputView = _priorityPickerView;

以下是選擇器視圖中的數據集：

// Picker View functions
-(NSInteger)numberOfComponantsInPickerView:(UIPickerView *)pickerView{
    return 1;
}

-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{
    return [_priorityPickerData count];
}

-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{
    return [self.priorityPickerData objectAtIndex:row];

}

-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{
    int select = row;
    if(select == 0){
        _priority.text = @"High";
    }else if(select == 1){
        _priority.text = @"Medium";
    }else if(select == 2){
        _priority.text = @"Low";
    }
}

提前謝謝了，

彼得

Answer 1

將委托和數據源設置為self：

_priorityPickerView.delegate = self;
_priorityPickerView.dataSource = self;

也位於.m文件的頂部：

@interface YourViewController ()<UIPickerViewDataSource,UIPickerViewDelegate>