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一：效果图

二：注意

对于方法[UIPopoverController dealloc] reached while popover is still visible.
当popover还在显示的时候,它就挂了
不允许popover还在显示的时候挂掉
popover必须在消失的时候挂掉

三：核心代码

- (IBAction)popMenu:(id)item {

    // 0.内容

    MenuViewController *menu = [[MenuViewController alloc] init];

    // 1.创建一个UIPopover

    UIPopoverController *popover = [[UIPopoverController alloc] initWithContentViewController:[[UINavigationController alloc] initWithRootViewController:menu]];

    // 2.设置尺寸

//    popover.popoverContentSize = CGSizeMake(320, 44 * 5);

    // 3.从哪里显示出来 --> 指向item

    [popover presentPopoverFromBarButtonItem:item permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];

    self.popover = popover;

}

四：全部代码展示

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.

// 当popover还在显示的时候,它就挂了

// 不允许popover还在显示的时候挂掉

// popover必须在消失的时候挂掉

/**

 *  弹出Popover菜单

 */

- (IBAction)popMenu:(id)item {

    // 0.内容

    MenuViewController *menu = [[MenuViewController alloc] init];

    // 1.创建一个UIPopover

    UIPopoverController *popover = [[UIPopoverController alloc] initWithContentViewController:[[UINavigationController alloc] initWithRootViewController:menu]];

    // 2.设置尺寸

//    popover.popoverContentSize = CGSizeMake(320, 44 * 5);

    // 3.从哪里显示出来 --> 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 = @[@"设置", @"清除缓存", @"退出", @"基本信息"];

    self.title = @"菜单";

    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