UIPickerView选择并隐藏

Question

你如何做一个UIPickerView像webview 的行为,其中有一个下拉选择框,而不是像通常的网站一样下降,iphone使其成为一个UIPickerView包含所有选择.当你选择一个,检查变得可见在您的选择旁边并更改下拉框的值.你怎么把"完成"按钮放在上面UIPickerView去解雇UIPickerView？

我已经知道这[pickerview setHidden:YES]是隐藏pickerview的方法.我只是不知道如何在"完成"按钮中包含UIPickerView.

问候,克里斯

Answer 1

这段代码将作为键盘滑出选择器视图,并在其上方附加一个完成按钮.基本上,您希望使用输入字段设置inputAccessoryView.您应该在输入字段的触地事件上调用此方法.

- (IBAction)showYourPicker:(id)sender {

// create a UIPicker view as a custom keyboard view
UIPickerView* pickerView = [[UIPickerView alloc] init];
[pickerView sizeToFit];
pickerView.autoresizingMask = (UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight);
pickerView.delegate = self;
pickerView.dataSource = self;
pickerView.showsSelectionIndicator = YES;
self.yourPickerView = pickerView;  //UIPickerView

yourTextField.inputView = pickerView;

// create a done view + done button, attach to it a doneClicked action, and place it in a toolbar as an accessory input view...
// Prepare done button
UIToolbar* keyboardDoneButtonView = [[UIToolbar alloc] init];
keyboardDoneButtonView.barStyle = UIBarStyleBlack;
keyboardDoneButtonView.translucent = YES;
keyboardDoneButtonView.tintColor = nil;
[keyboardDoneButtonView sizeToFit];

UIBarButtonItem* doneButton = [[[UIBarButtonItem alloc] initWithTitle:@"Done"
    style:UIBarButtonItemStyleBordered target:self
    action:@selector(pickerDoneClicked:)] autorelease];

[keyboardDoneButtonView setItems:[NSArray arrayWithObjects:doneButton, nil]];

// Plug the keyboardDoneButtonView into the text field...
yourTextField.inputAccessoryView = keyboardDoneButtonView;  

[pickerView release];
[keyboardDoneButtonView release];
}

最后,您的完成按钮调用"pickerDoneClicked"方法,您应该在[yourTextField resignFirstResponder];其中添加 隐藏选择器视图的方法.

Answer 2

"完成"按钮放在UIToolBar中.

使用UIToolBar的以下方法添加"完成"按钮.

- (void)setItems:(NSArray *)items animated:(BOOL)animated {

    UIToolbar*  mypickerToolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 320, 56)];
    mypickerToolbar.barStyle = UIBarStyleBlackOpaque;
    [mypickerToolbar sizeToFit];

    NSMutableArray *barItems = [[NSMutableArray alloc] init];

    UIBarButtonItem *flexSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil];
    [barItems addObject:flexSpace];

    UIBarButtonItem *doneBtn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(DatePickerDoneClick)];
    [barItems addObject:doneBtn];

    [mypickerToolbar setItems:barItems animated:YES];

}