Question

当用户点击我的视图上的文本字段时，我有一个UIDatePicker以编程方式创建（作为第一响应者）。这发生在for循环中，所以我的代码中没有对这个选择器的引用。我的选择器顶部还有一个工具栏，它作为inputAccessoryView添加到选取器中。我有一个完成按钮，用于重新启动第一响应者。到目前为止一切都很好。

除了完成按钮，我想在工具栏上添加另一个按钮，这将改变选择器的值。没有UIDatePickerDelegate可以让我跟踪有效的选择器。

我总是可以为每个选择器定义类变量，从而手动保存引用。但有一种简单的方法可以直接从inputView访问inputAccessoryView吗？

Answer 1

这在some.h文件中

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController

{
     IBOutlet UIDatePicker *picker1;
     IBOutlet UITextField *txtFld;

}
@property (nonatomic, retain) UIToolbar *keyboardToolbar;

@end

在some.m文件中

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
         [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
 picker1=[[UIDatePicker alloc] initWithFrame:CGRectMake(0, 0, 320, 300)];//frames are just for demo
 [txtFld setInputView:picker1];
}

- (void)keyboardWillShow:(NSNotification *)notification
{
    if(keyboardToolbar == nil) {
        keyboardToolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 410, 320, 44)] ;
        [keyboardToolbar setBarStyle:UIBarStyleBlackTranslucent];
        [keyboardToolbar sizeToFit];

        [UIView beginAnimations:nil context:NULL];
        [UIView setAnimationDuration:0.4];

        UIBarButtonItem *flexButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil];

        UIBarButtonItem *doneButton1 =[[UIBarButtonItem alloc] initWithTitle:@"Done" style:UIBarButtonItemStyleDone target:self action:@selector(resignKeyboard)];
        NSArray *itemsArray = [NSArray arrayWithObjects:flexButton,doneButton1, nil];

        [keyboardToolbar setItems:itemsArray];


        [txtFld setInputAccessoryView:keyboardToolbar];
        [self.view addSubview:keyboardToolbar];
        [UIView commitAnimations];
    }
}



-(void)resignKeyboard {

    [keyboardToolbar removeFromSuperview];
    [txtFld resignFirstResponder];
///do nescessary date calculation here

    }

从InputAccessoryView上的按钮更改uidatepicker的值

1 个答案: