UIPopover 如何使用这样的按钮制作弹出框？答案

【问题标题】：UIPopover How do I make a popover with buttons like this?UIPopover 如何使用这样的按钮制作弹出框？
【发布时间】：2012-05-31 10:28:54
【问题描述】：

我想知道如何使用这样的按钮创建一个弹出框。

回答：

UIActionSheet * actionSheet = [[UIActionSheet alloc] initWithTitle: nil 
                                                          delegate: self
                                                 cancelButtonTitle: nil 
                                            destructiveButtonTitle: nil 
                                                 otherButtonTitles: @"Take Photo",
                                                                    @"Choose Existing Photo", nil];

[actionSheet showFromRect: button.frame inView: button.superview animated: YES];

委托对象类中的其他位置...

-(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
    if (buttonIndex == 0) {
         // take photo...
    } 
    else if (buttonIndex == 1) {
         // choose existing photo...
    }
}

【问题讨论】：

标签： ios ipad uipopovercontroller uiactionsheet uialertcontroller

【解决方案1】：

这是UIActionSheet。在 iPhone 上，它从底部动画。在 iPad 上，它会出现在弹出窗口中。

假设您按下按钮即可：

UIActionSheet * actionSheet = [[UIActionSheet alloc] initWithTitle: nil 
                                                          delegate: self
                                                 cancelButtonTitle: nil 
                                            destructiveButtonTitle: nil 
                                                 otherButtonTitles: @"Take Photo",
                                                                    @"Choose Existing Photo", nil];

[actionSheet showFromRect: button.frame inView: button.superview animated: YES];

在 iOS8+ 中，您应该使用新的 UIAlertController 类：

UIAlertController * alertController = [UIAlertController alertControllerWithTitle: nil
                                                                          message: nil
                                                                   preferredStyle: UIAlertControllerStyleActionSheet];
[alertController addAction: [UIAlertAction actionWithTitle: @"Take Photo" style: UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
    // Handle Take Photo here
}]];
[alertController addAction: [UIAlertAction actionWithTitle: @"Choose Existing Photo" style: UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
    // Handle Choose Existing Photo here
}]];

alertController.modalPresentationStyle = UIModalPresentationPopover;

UIPopoverPresentationController * popover = alertController.popoverPresentationController;
popover.permittedArrowDirections = UIPopoverArrowDirectionUp;
popover.sourceView = sender;
popover.sourceRect = sender.bounds;

[self presentViewController: alertController animated: YES completion: nil];

或在 Swift 中

let alertController = UIAlertController(title: nil, message: nil, preferredStyle: .ActionSheet)
alertController.addAction(UIAlertAction(title: "Take Photo", style: .Default, handler: { alertAction in
    // Handle Take Photo here
    }))
alertController.addAction(UIAlertAction(title: "Choose Existing Photo", style: .Default, handler: { alertAction in
    // Handle Choose Existing Photo
    }))
alertController.modalPresentationStyle = .Popover

let popover = alertController.popoverPresentationController!
popover.permittedArrowDirections = .Up
popover.sourceView = sender
popover.sourceRect = sender.bounds

presentViewController(alertController, animated: true, completion: nil)

【讨论】：

我是否只是将其添加到 Popover 视图中？
不，只需使用 UIActionSheet showFrom... 方法之一。有关示例，请参阅我的更新答案
好的，还有 1 个问题，如何为按钮设置事件处理程序？
可以将新的 Facebook 分享按钮放在 UIAlertController 中，还是我需要编写一个客户弹出框？我尝试了第二种方法，因为 Storyboard 似乎在链接到特定 UITableViewCell 的弹出框上阻塞并且无法编译。

【解决方案2】：

与其他响应类似，但相比之下这很容易实现。

让您的班级使用 UIActionSheetDelegate。

例子：

@interface ExampleViewController : UIViewController <UIActionSheetDelegate>

然后添加到您的 ExampleViewController.mm/m

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex  { //Get the name of the current pressed button 
NSString *buttonTitle = [actionSheet buttonTitleAtIndex:buttonIndex]; 
if  ([buttonTitle isEqualToString:@"Remove"]) {
    NSLog(@"Remove this actionSheet"); } 
if ([buttonTitle isEqualToString:@"Button 1"]) {
    NSLog(@"Button 1 pressed"); } 
if ([buttonTitle isEqualToString:@"Button 2"]) {
    NSLog(@"Button 2 pressed"); }
if ([buttonTitle isEqualToString:@"Button 3"]) {
    NSLog(@"Button 3 pressed"); } 
if ([buttonTitle isEqualToString:@"Cancel"]) {
    NSLog(@"Cancel clicked (anywhere away from it)"); } }

现在在按钮按下事件或您希望弹出的位置/时间调用以下命令：

    - (IBAction)aButtonPressed:(id)sender {
     NSString *actionSheetTitle = @"Action Sheet"; // Title 
     NSString *destroyTitle = @"Destroy"; // Button titles
     NSString *button1 = @"Button 1"; 
     NSString *button2 = @"Button 2";
     NSString *button3 = @"Button 3";
     NSString *cancelTitle = @"Cancel"; 
    UIActionSheet *actionSheet = [[UIActionSheet alloc]
                                  initWithTitle:actionSheetTitle
                                   delegate:self
                                   cancelButtonTitle:cancelTitle
                                   destructiveButtonTitle:destroyTitle
                                   otherButtonTitles:button1, button2, button3, nil]; [actionSheet showInView:self.view];
}

【讨论】：

别忘了添加 [actionSheet showFromRect:[(UIButton *)sender frame] inView:self.view animated:YES];将弹出框附加到发件人按钮。