一：效果圖

二：注意

對於方法[UIPopoverController dealloc] reached while popover is still visible.
當popover還在顯示的時候,它就掛了
不允許popover還在顯示的時候掛掉
popover必須在消失的時候掛掉

三：核心代碼

- (IBAction)popMenu:(id)item {
    // 0.內容
    MenuViewController *menu = [[MenuViewController alloc] init];

    // 1.創建一個UIPopover
    UIPopoverController *popover = [[UIPopoverController alloc] initWithContentViewController:[[UINavigationController alloc] initWithRootViewController:menu]];

    // 2.設置尺寸
//    popover.popoverContentSize = CGSizeMake(320, 44 * 5);

    // 3.從哪裡顯示出來 --> 指向item
    [popover presentPopoverFromBarButtonItem:item permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];

    self.popover = popover;
}

四：全部代碼展示

ViewController

#import ViewController.h
#import MenuViewController.h

@interface ViewController ()
- (IBAction)popMenu:(id)item;
@property (nonatomic, strong) UIPopoverController *popover;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

}

// -[UIPopoverController dealloc] reached while popover is still visible.
// 當popover還在顯示的時候,它就掛了
// 不允許popover還在顯示的時候掛掉
// popover必須在消失的時候掛掉

/**
 *  彈出Popover菜單
 */
- (IBAction)popMenu:(id)item {
    // 0.內容
    MenuViewController *menu = [[MenuViewController alloc] init];

    // 1.創建一個UIPopover
    UIPopoverController *popover = [[UIPopoverController alloc] initWithContentViewController:[[UINavigationController alloc] initWithRootViewController:menu]];

    // 2.設置尺寸
//    popover.popoverContentSize = CGSizeMake(320, 44 * 5);

    // 3.從哪裡顯示出來 --> 指向item
    [popover presentPopoverFromBarButtonItem:item permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];

    self.popover = popover;
}
@end

MenuViewController

#import MenuViewController.h

@interface MenuViewController ()
@property (nonatomic, strong) NSArray *titles;
@end

@implementation MenuViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    self.titles = @[@設置, @清除緩存, @退出, @基本信息];
    self.title = @菜單;
    self.view.backgroundColor = [UIColor blueColor];

    CGFloat w = 320;
    CGFloat h = self.titles.count * 44;
    self.preferredContentSize = CGSizeMake(w, h);
//    self.contentSizeForViewInPopover = CGSizeMake(w, h);
}

#pragma mark - Table view data source
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return self.titles.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *ID = @cell;
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:ID];
    if (!cell) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:ID];
    }

    cell.textLabel.text = self.titles[indexPath.row];

    return cell;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    UIViewController *vc = [[UIViewController alloc] init];
    vc.view.backgroundColor = [UIColor redColor];
    [self.navigationController pushViewController:vc animated:YES];
}

@end