前言:

以前听到过有一个叫做 POPViewController 的东西，以前接触过，但是没成功弄出来。
今天在 UI 稿里再次看到了这个玩意。
~~出来混，早晚要还的~~

第一步 Command + C

#import "POPViewController.h"

/// iOS POP 弹出视图 （自行创建一个 ViewController，然后遵守协议 ）
@interface POPViewController () <UIPopoverPresentationControllerDelegate>

@end

@implementation POPViewController

- (void)viewDidLoad {
    [super viewDidLoad];
}
//这是从 XIB 中拖出来的按钮点击事件
- (IBAction)action:(UIButton *)sender {
    
    //新创建一个要显示的控制器
    UIViewController *controller = [[UIInputViewController alloc] init];
    controller.view.backgroundColor = [UIColor greenColor];
    controller.preferredContentSize = CGSizeMake(300, 300);        //popover视图的大小
    controller.modalPresentationStyle = UIModalPresentationPopover;//这句一定要

    // 创建一个显示文字的 Label 添加进去
    UILabel *l = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 300, 300)]; //Label 的尺寸和位置参考 上面的 controller.preferredContentSize
    l.backgroundColor = [UIColor yellowColor];
    l.numberOfLines = 0;
    l.text = @"My name is Van, I am an artist, a performance artist, I am hired for people to fulfill their fantasies, their deep dark fantasies. I was going to be a movie star, you know, was modeling and acting. After a hundred or two auditions and small parts, you know, I decided.. that I had enough, then I ceded into escort work.";
    [controller.view addSubview:l];
    
    UIPopoverPresentationController *popController = controller.popoverPresentationController;
    popController.delegate = self;  //代理一定要
    popController.sourceView = controller.view; //设置要弹出哪个 视图 (上面自定的控制器的视图)
    popController.sourceRect = CGRectMake(sender.frame.origin.x, sender.frame.origin.y, 0, 0);  //设置弹出框箭头的位置
    [popController setPermittedArrowDirections:UIPopoverArrowDirectionUp]; //设置弹出框箭头的方向
    
    [self presentViewController:controller animated:YES completion:nil];
}

#pragma mark - 代理
-(UIModalPresentationStyle)adaptivePresentationStyleForPresentationController:(UIPresentationController *)controller {
    return UIModalPresentationNone;
}

@end