iphone - UIPickerView 选择和隐藏

Question

如何使 UIPickerView 像带有下拉选择框的 webview 一样工作，而不是像通常的网站那样下拉，iphone使其成为包含所有选择的 UIPickerView。当您选择一个时，您的选择旁边会显示一个复选标记并更改下拉框的值。以及如何将“完成”按钮放在 UIPickerView 顶部以关闭 UIPickerView？

我已经知道 [pickerview setHidden:YES] 是用来隐藏 pickerview 的方法。我只是不知道如何在 UIPickerView 中包含“完成”按钮。

问候，克里斯

Answer 1

这段代码将作为键盘滑出一个选择器 View ，并在其顶部附加一个完成按钮。基本上，您想使用输入字段设置一个 inputAccessoryView。您应该在输入字段的触及事件上调用此方法。

- (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，您应该在其中添加[yourTextField resignFirstResponder]; 这将隐藏选择器 View 。