Question

如何实施模态日期选择器？

我想要发生的是当用户输入文本字段时，会创建一个包含日期选择器的新视图。从那里，用户可以交互并选择日期。当视图关闭时，它应该以某种方式将日期返回给它的调用者。这可能吗？

顺便说一句，由于篇幅原因，我无法将日期选择器放在我的主表单上。

提前致谢。

Answer 1

使用代表！

部首：

@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

类：

@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

如果您愿意，可以使用NIB替换loadView中的所有垃圾。只需确保将datePicker声明为IBOutlet。当你想要真正使用它时：

- (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

更简单的工作解决方案：

在你的.h：

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

在你的.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;
}

就是这样。（我在当地测试并且有效）

iphone SDK：如何实现模态日期选择器？

2 个答案: