iphone SDK：如何實現模式日期選擇器？

Question

如何實現模式日期選擇器？

我想要發生的是，當用戶輸入一個文本字段時，會創建一個新的視圖，其中包含日期選擇器。從那裏，用戶可以交互並選擇一個日期。當視圖關閉時，它應該以某種方式將日期返回給調用者。這可能嗎？

順便說一句，我不能把日期選擇器放在我的主窗體上，因爲空間。

在此先感謝。

Answer 1

使用委託人！

頁眉：

@class DatePickerController; 
@protocol DatePickerControllerDelegate 
- (void) datePickerController:(DatePickerController *)controller didPickDate:(NSDate *)date; 
@end 

@interface DatePickerController : UIViewController { 
    UIDatePicker *datePicker; 
    NSObject <DatePickerControllerDelegate> *delegate; 
} 

@property (nonatomic, retain) UIDatePicker *datePicker; 
@property (nonatomic, assign) NSObject <DatePickerControllerDelegate> *delegate; 
@end 

類：

@implementation DatePickerController 
- (void) loadView { 
    self.view = [[[UIView alloc] init] autorelease]; 
    self.datePicker = [[[UIDatePicker alloc] init] autorelease]; 
    [self.view addSubview:self.datePicker]; 
    UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect]; 
    [button setTitle:@"Done" forState:UIControlStateNormal]; 
    button.center = CGPointMake(160,240); 
    [button addTarget:self action:@selector(done) forControlEvents:(UIControlEventTouchUpInside)]; 
    [self.view addSubview:button]; 
} 

- (void) done { 
    [delegate datePickerController:self didPickDate:datePicker.date]; 
} 

- (void) dealloc { 
    [datePicker release]; 
    [super dealloc]; 
} 

@end 

中的loadView所有的垃圾可以用NIB如果你願意更換。只要確保將datePicker聲明爲IBOutlet即可。 而當你要實際使用它：

- (void) pickDate { 
    DatePickerController *screen = [[[DatePickerController alloc] init] autorelease]; 
    screen.delegate = self; 
    [self presentModalViewController:screen animated:YES]; 
} 

- (void) datePickerController:(DatePickerController *)controller didPickDate:(NSDate *)date { 
    [self doSomethingWithDate:date]; 
    [controller dismissModalViewControllerAnimated:YES]; 
} 

Answer 2

簡單有效的解決方案：

在你的.h：

@property (nonatomic,strong) IBOutlet UIDatePicker *datePicker; 
@property (weak, nonatomic) IBOutlet UITextField *historyDateSelect; 
@property (nonatomic, retain) UIToolbar *dateToolbar; 

在您的m：

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 


    self.datePicker = [[UIDatePicker alloc]init]; 
    [self.datePicker addTarget:self action:@selector(dateChanged) forControlEvents:UIControlEventValueChanged]; 


    UIToolbar *toolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)]; 
    UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:nil action:nil];  
    [toolbar setItems:[NSArray arrayWithObject:doneButton]]; 

    self.dateToolbar = toolbar; 

    self.historyDateSelect.inputView = self.datePicker; 
    self.historyDateSelect.inputAccessoryView = self.dateToolbar; 
} 

而且而已。 （我在本地測試和工作）