iphone 与 ipad -- UIPopoverPresentationViewController

　　iOS8.0之后, 苹果推出了UIPopoverPresentationViewController, 在弹出控制器时, 统一采用 presentViewController,

但是要实现iPhone和iPad能够统一使用一段代码, 需要进行一些设置:

@implementation ViewController

// UIPopoverController只能用在iPad

- (void)viewDidLoad {

[super viewDidLoad];

// Do any additional setup after loading the view, typically fro

}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {

HMSecondViewController *vc = [[HMSecondViewController alloc] init];

// modal出来是个popover

vc.modalPresentationStyle = UIModalPresentationPopover;

// 取出vc所在的UIPopoverPresentationController

vc.popoverPresentationController.sourceView = self.slider;

vc.popoverPresentationController.sourceRect = self.slider.bounds;

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

}

@end

例如: UIAlertController

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {

UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"警告" message:@"你有严重的精神病,赶紧去治疗" preferredStyle:UIAlertControllerStyleActionSheet];

// 默认是POPover

alert.modalPresentationStyle = UIModalPresentationPopover;

// 设置popover指向的item

//    alert.popoverPresentationController.barButtonItem = self.navigationItem.leftBarButtonItem;

alert.popoverPresentationController.sourceView = _clickBtn;

alert.popoverPresentationController.sourceRect = _clickBtn.bounds;

// 添加按钮

[alert addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDestructive handler:^(UIAlertAction *action) {

NSLog(@"点击了确定按钮");

}]];

[alert addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction *action) {

NSLog(@"点击了取消按钮");

}]];

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

}