typedef NS_OPTIONS(NSUInteger, UIPopoverArrowDirection) {

UIPopoverArrowDirectionUp = 1UL << 0,     //箭头往上指向按钮

UIPopoverArrowDirectionDown = 1UL << 1, //箭头往下指向按钮

UIPopoverArrowDirectionLeft = 1UL << 2,  //箭头往左指向按钮

UIPopoverArrowDirectionRight = 1UL << 3, //箭头往右指向按钮

UIPopoverArrowDirectionAny = UIPopoverArrowDirectionUp | UIPopoverArrowDirectionDown | UIPopoverArrowDirectionLeft | UIPopoverArrowDirectionRight,  //箭头方向自适应

UIPopoverArrowDirectionUnknown = NSUIntegerMax  //箭头方向未知

};

#import "ContentViewController.h"
@interface ContentViewController ()
@end@implementation ContentViewController
- (void)viewDidLoad {[super viewDidLoad];//设置视图颜色self.view.backgroundColor = [UIColor redColor];//设置内容控制器显示局域大小self.preferredContentSize = CGSizeMake(100, 200);
}
@end

#import "ViewController.h"
#import "ContentViewController.h"@interface ViewController ()
@property (strong,nonatomic)UIPopoverController *popoverVC;    //声明弹出窗控制器
@property (strong,nonatomic)ContentViewController *contentVC;  //声明内容控制器
@end

- (void)viewDidLoad {[super viewDidLoad];//创建按钮UIButton *button = [[UIButton alloc]initWithFrame:CGRectMake(100, 100, 40, 40)];//设置按钮标题[button setTitle:@"打开" forState:UIControlStateNormal];//设置按钮背景颜色button.backgroundColor = [UIColor purpleColor];//添加事件,用来打开弹出窗
   [button addTarget:self action:@selector(Open:) forControlEvents:UIControlEventTouchUpInside];//添加按钮到视图中
    [self.view addSubview:button];
}

-(void)Open:(UIButton *)sender
{if (!self.popoverVC.isPopoverVisible){//设置内容控制器self.contentVC = [[ContentViewController alloc]init];//创建UIPopoverController（将当前视图控制器设置为内容控制器）self.popoverVC = [[UIPopoverController alloc]initWithContentViewController:self.contentVC];//设置一直显示区域,此时点击视图和弹出窗与用户不会发生任何交互,只有按钮能与用户交互self.popoverVC.passthroughViews = @[self.view,sender];//打开popoverVC控制器,设置箭头方向为自适应
        [self.popoverVC presentPopoverFromRect:sender.bounds inView:sender permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];}else{//关闭popoverVC控制器
        [self.popoverVC dismissPopoverAnimated:YES];}
}

#import "ViewController.h"
#import "ContentViewController.h"@interface ViewController ()
@property (strong,nonatomic)UIPopoverController *popoverVC;  //声明弹出窗控制器
@property (strong,nonatomic)ContentViewController *contentVC;//声明内容控制器
@end

- (void)viewDidLoad {[super viewDidLoad];//创建工具栏控件UIToolbar *toolBar = [[UIToolbar alloc]init];toolBar.frame = CGRectMake(0, 0, self.view.frame.size.width,40);//创建工具栏目UIBarButtonItem *item = [[UIBarButtonItem alloc]initWithTitle:@"打开" style:UIBarButtonItemStylePlain target:self action:@selector(Open:)];UIBarButtonItem *fixItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];fixItem.width = 200;//将工具栏目添加到工具栏
    [toolBar setItems:@[fixItem,item]];//将工具栏添加到控制器视图中
    [self.view addSubview:toolBar];
}

#pragma mark -打开弹窗
-(void)Open:(UIBarButtonItem *)sender
{if (!self.popoverVC.popoverVisible){//创建内容控制器self.contentVC = [[ContentViewController alloc]init];//创建popoverVCself.popoverVC = [[UIPopoverController alloc]initWithContentViewController:self.contentVC];//设置内容显示区域大小和背景颜色//self.popoverVC.popoverContentSize = CGSizeMake(100, 200);[self.popoverVC setPopoverContentSize:CGSizeMake(100, 200) animated:YES];self.popoverVC.backgroundColor = [UIColor redColor];//设置一直显示的区域,过滤了当前视图和内容区域，此时只有UIBarButtonItem能与用户进行交互self.popoverVC.passthroughViews = @[self.view,sender];//打开弹窗口
        [self.popoverVC presentPopoverFromBarButtonItem:sender permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];}else{//关闭弹窗口
        [self.popoverVC dismissPopoverAnimated:YES];}
}