UITextField顯示UIPickerView在xcode 4.3.2使用textField.inputView

Question

我正在尋找一個UITextField在觸摸時顯示UIPickerView。我在使用UITextField.inputView的同一主題上發現了很多問題。但是，當我嘗試時，沒有任何變化。

我有一個非常簡單的代碼：

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; 
} 

我覺得我可能失去了一些東西根本，但老實說，我不認爲它是什麼。

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)." 

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