UITextField使用textField.inputView在xcode 4.3.2中显示UIPickerView

Question

我想让UITextField在触摸时显示UIPickerView。我在同一主题上发现了很多问题，都说要使用UITextField.inputView。然而，当我尝试时，什么都没有改变。

我有一个非常简单的代码：

setupViewController.h
#import <UIKit/UIKit.h>
extern NSString *setupRightChannel;
@interface setupViewController : UIViewController
{
    UITextField* rightChannelField; 
    UIPickerView *channelPicker;
}
@property (retain, nonatomic) IBOutlet UITextField* rightChannelField;
@property (retain, readwrite) IBOutlet UIPickerView *channelPicker;

---

setupViewController.m
#import "setupViewController.h"
@Interface setupViewController()
@end
@implementation setupViewController
@synthesize rightChannelField;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.navigationItem.title = @"Setup";
    // Do any additional setup after loading the view from its nib.
    rightChannelField.inputView = channelPicker;
}
-(IBAction)okClicked:(id)sender
{
    setupRightChannel = rightChannelField.text;
}

我觉得我可能错过了一些基本的东西，但我真的想不出它是什么。

Answer 1

datePicker = [[UIDatePicker alloc]initWithFrame:CGRectMake(0, 250, 325, 300)];
datePicker.datePickerMode =UIDatePickerModeDate;
NSDateFormatter *dateFormatter =[[NSDateFormatter alloc]init];
[dateFormatter setFormatterBehavior:NSDateFormatterBehavior10_4];
[dateFormatter setLocale:[[NSLocale alloc] initWithLocaleIdentifier:@"en_US"]];
[dateFormatter setDateFormat:@"dd MMM yyyy"];
[datePicker addTarget:self action:@selector(dueDateChanged) forControlEvents:UIControlEventValueChanged];
UIToolbar *pickerToolBar =[[UIToolbar alloc]initWithFrame:CGRectMake(0,0, 320,44)];
pickerToolBar.barStyle =UIBarStyleBlackOpaque;
UIBarButtonItem *barButton =[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
UIBarButtonItem *doneButton =[[UIBarButtonItem alloc] initWithTitle:@"Done"
                                                              style:UIBarButtonItemStyleDone target:self
                                                             action:@selector(closeDueDatePicker:)];
[pickerToolBar setItems:[NSArray arrayWithObjects:barButton, doneButton,nil]];
[self.datePicker addSubview:pickerToolBar];
dueDateTextField.inputView =datePicker; // "This is what changes textfields default responder from keyboard to what ever view you assign it (DatePicker view in this case)." 

感谢