iphone - UITextField がクリックされたときに UIPickerView を表示する

Question

多くのテキストフィールドがある画面があります。ある特定のテキスト フィールドについて、ユーザーが州名を選択できるピッカーを表示する必要があります。ユーザーが州名をクリックして州を選択すると、ピッカーは消えます。

これを行う方法がよくわかりません。次のような Nib ファイルを作成しました。

そして、ここに私のヘッダーファイルがあります:

#import <UIKit/UIKit.h>
#import "APIHelper.h"

@interface AddNewAddressViewController : UIViewController <UIPickerViewDelegate,              
UIPickerViewDataSource, UITextFieldDelegate>
{
    APIHelper *myAPIHelper;    
    NSMutableData *responseData;
    NSURLConnection *theConnection;

    UIPickerView *picker;
    NSArray *stateNames;

    @public IBOutlet UIImageView *imageNewAddressBox;
    @public IBOutlet UIImageView *imageNewAddressBox1;    
    @public IBOutlet UIImageView *imageNewAddressBox2;    
    @public IBOutlet UIImageView *imageNewAddressBox3;

    @public IBOutlet UILabel *labelNewAddress;    
    @public IBOutlet UILabel *labelStreetAddress;    
    @public IBOutlet UILabel *labelStreetAddressTwo;    
    @public IBOutlet UILabel *labelZipCode;    
    @public IBOutlet UILabel *labelState;    
    @public IBOutlet UILabel *labelCity;    
    @public IBOutlet UILabel *labelPhoneNumber;    

    @public IBOutlet UITextField *textFieldFullName;
    @public IBOutlet UITextField *textFieldStreetAddress;
    @public IBOutlet UITextField *textFieldPhoneNumber;
    @public IBOutlet UITextField *textFieldStreetAddressTwo;
    @public IBOutlet UITextField *textFieldCity;
    @public IBOutlet UITextField *textFieldState;
    @public IBOutlet UITextField *textFieldZipCode;

    @public IBOutlet UIButton *buttonNext;
}

@property (nonatomic, strong) IBOutlet UIPickerView *picker;
@property (nonatomic, strong) NSArray *stateNames;

@property (nonatomic, strong) IBOutlet UIImageView *imageNewAddressBox;
@property (nonatomic, strong) IBOutlet UIImageView *imageNewAddressBox1;
@property (nonatomic, strong) IBOutlet UIImageView *imageNewAddressBox2;
@property (nonatomic, strong) IBOutlet UIImageView *imageNewAddressBox3;

@property (nonatomic, strong) IBOutlet UILabel *labelNewAddress;
@property (nonatomic, strong) IBOutlet UILabel *labelStreetAddress;
@property (nonatomic, strong) IBOutlet UILabel *labelStreetAddressTwo;
@property (nonatomic, strong) IBOutlet UILabel *labelZipCode;
@property (nonatomic, strong) IBOutlet UILabel *labelState;
@property (nonatomic, strong) IBOutlet UILabel *labelCity;
@property (nonatomic, strong) IBOutlet UILabel *labelPhoneNumber;

@property (nonatomic, strong) IBOutlet UITextField *textFieldFullName;
@property (nonatomic, strong) IBOutlet UITextField *textFieldStreetAddress;
@property (nonatomic, strong) IBOutlet UITextField *textFieldPhoneNumber;
@property (nonatomic, strong) IBOutlet UITextField *textFieldStreetAddressTwo;
@property (nonatomic, strong) IBOutlet UITextField *textFieldCity;
@property (nonatomic, strong) IBOutlet UITextField *textFieldState;
@property (nonatomic, strong) IBOutlet UITextField *textFieldZipCode;

@property (nonatomic, strong) IBOutlet UIButton *buttonNext;

-(IBAction)addressTextFieldShouldReturn:(id)sender;
-(IBAction)nextPressed;

@end

そして、ここに私の.Mファイルがあります：

#import "AddNewAddressViewController.h"

@implementation AddNewAddressViewController

@synthesize imageNewAddressBox;
@synthesize imageNewAddressBox1;
@synthesize imageNewAddressBox2;
@synthesize imageNewAddressBox3;
@synthesize labelNewAddress;
@synthesize labelStreetAddress;
@synthesize labelStreetAddressTwo;
@synthesize labelZipCode;
@synthesize labelState;
@synthesize labelCity;
@synthesize labelPhoneNumber;
@synthesize textFieldFullName;
@synthesize textFieldStreetAddress;
@synthesize textFieldPhoneNumber;
@synthesize textFieldStreetAddressTwo;
@synthesize textFieldCity;
@synthesize textFieldState;
@synthesize textFieldZipCode;
@synthesize buttonNext;
@synthesize stateNames;
@synthesize picker;


- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    self.stateNames = [[NSArray alloc] initWithObjects:@"Alabama", @"Alaska", @"Arizona", @"Arkansas", @"California", @"Colorado", @"Connecticut", @"Delaware", @"District of Columbia", @"Florida", @"Georgia", @"Guam", @"Hawaii", @"Idaho", @"Illinois", @"Indiana", @"Iowa", @"Kansas", @"Kentucky", @"Louisiana", @"Maine", @"Maryland", @"Massachusetts", @"Michigan", @"Minnesota", @"Mississippi", @"Missouri", @"Montana", @"Nebraska", @"Nevada", @"New Hampshire", @"New Jersey", @"New Mexico", @"New York", @"North Carolina", @"North Dakota", @"Ohio", @"Oklahoma", @"Oregon", @"Pennsylvania", @"Puerto Rico", @"Rhode Island", @"South Carolina", @"South Dakota", @"Tennessee", @"Texas", @"Utah", @"Vermont", @"Virginia", @"Virgin Islands", @"Washington", @"West Virginia", @"Wisconsin", @"Wyoming", nil];

    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.

    // clicking outside the textfields removes keyboard
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]
                                   initWithTarget:self
                                   action:@selector(addressTextFieldShouldReturn:)];
    [self.view addGestureRecognizer:tap];    
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    [self setTitle: @"Update Address Book"];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (void)viewDidUnload {
    [super viewDidUnload];
}

-(IBAction)addressTextFieldShouldReturn:(id)sender
{
    [textFieldFullName resignFirstResponder];
    [textFieldStreetAddress resignFirstResponder];
    [textFieldStreetAddressTwo resignFirstResponder];
    [textFieldPhoneNumber resignFirstResponder];
    [textFieldState resignFirstResponder];
    [textFieldCity resignFirstResponder];
    [textFieldZipCode resignFirstResponder];
    [sender resignFirstResponder];
}

#pragma mark -
#pragma mark PickerView DataSource

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
    return 1;
}
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
    return [stateNames count];
}
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:    (NSInteger)component
{
    return [stateNames objectAtIndex:row];
}
@end

したがって、ユーザーが textFieldState をクリックすると、すべての州名を含むピッカーが下からポップアップし、ユーザーが州名をクリックすると、その名前が textFieldState に表示されます。

どんな助けでも大歓迎です。ありがとう。