一、UIPopoverPresentationController

之前系统自带的UIPopoverController是专门为iPad服务的弹框视图，UIPopoverPresentationController是iOS8以后新增的，是UIViewController的属性。使用的的时候，需要创建的是UIViewController。

20160905172221309.png

//初始化内容视图控制器
      MyViewController *contentVC = [[MyViewController alloc]init];
     //设置大小
         contentVC.preferredContentSize = CGSizeMake(110, 160);
     
   //设置内容控制器模态显示类型为模态弹出窗
     contentVC.modalPresentationStyle = UIModalPresentationPopover;
     //初始化一个popover
         self.popover = contentVC.popoverPresentationController;
    //代理一定要
         self.popover.delegate = self;
     //设置弹出视图的颜色
         self.popover.backgroundColor = [UIColor greenColor];
     //设置popover的来源按钮（以button谁为参照）
         self.popover.sourceView =button;
     //设置弹出视图的位置（以button谁为参照）
         self.popover.sourceRect = button.bounds;
    //箭头的方向 设置成UIPopoverArrowDirectionAny 会自动转换方向
     self.popover.permittedArrowDirections = UIPopoverArrowDirectionUp;
    //模态出弹框
         [self presentViewController:contentVC animated:YES completion:nil];//推出popover

pragma mark -- 实现代理方法

//默认返回的是覆盖整个屏幕，需设置成UIModalPresentationNone。
 - (UIModalPresentationStyle)adaptivePresentationStyleForPresentationController:(UIPresentationController *)controller{
     return UIModalPresentationNone;
 }
 
//点击蒙版是否消失，默认为yes；
 
-(BOOL)popoverPresentationControllerShouldDismissPopover:(UIPopoverPresentationController *)popoverPresentationController{
    return YES;
}
 
//弹框消失时调用的方法
-(void)popoverPresentationControllerDidDismissPopover:(UIPopoverPresentationController *)popoverPresentationController{
    
    NSLog(@"弹框已经消失");
    
}

二、UIAlertController

UIAlertView在IOS 8以上版本已经过时了，官方推荐我们使用UIAlertController代替UIAlertView、UIActionSheet

• 1、UIAlertController显示普通的Alert

  
  20161226165508246.png

//显示提示框  
    //过时  
//    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Title" message:@"message" delegate:self cancelButtonTitle:@"cancel" otherButtonTitles:@"ok", nil];  
//    [alert show];  
    UIAlertController* alert = [UIAlertController alertControllerWithTitle:@"Title"  
                                                                   message:@"This is an alert."  
                                                            preferredStyle:UIAlertControllerStyleAlert];  
      
    UIAlertAction* defaultAction = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault  
                                                          handler:^(UIAlertAction * action) {  
                                                              //响应事件  
                                                              NSLog(@"action = %@", action);  
                                                          }];  
    UIAlertAction* cancelAction = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleDefault  
                                                          handler:^(UIAlertAction * action) {  
                                                              //响应事件  
                                                              NSLog(@"action = %@", action);  
                                                          }];  
  
    [alert addAction:defaultAction];  
    [alert addAction:cancelAction];  
    [self presentViewController:alert animated:YES completion:nil];  

• 2､UIAlertController显示带文本输入的的Alert

  
  20161226165520818.png

   //提示框添加文本输入框  
    UIAlertController* alert = [UIAlertController alertControllerWithTitle:@"Title"  
                                                                   message:@"This is an alert."  
                                                            preferredStyle:UIAlertControllerStyleAlert];  
      
    UIAlertAction* okAction = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault  
                                                          handler:^(UIAlertAction * action) {  
                                                              //响应事件  
                                                              //得到文本信息  
                                                              for(UITextField *text in alert.textFields){  
                                                                  NSLog(@"text = %@", text.text);  
                                                              }  
                                                          }];  
    UIAlertAction* cancelAction = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleCancel  
                                                         handler:^(UIAlertAction * action) {  
                                                             //响应事件  
                                                             NSLog(@"action = %@", alert.textFields);  
                                                         }];  
    [alert addTextFieldWithConfigurationHandler:^(UITextField *textField) {  
        textField.placeholder = @"登录";  
    }];  
    [alert addTextFieldWithConfigurationHandler:^(UITextField *textField) {  
        textField.placeholder = @"密码";  
        textField.secureTextEntry = YES;  
    }];  
      
    [alert addAction:okAction];  
    [alert addAction:cancelAction];  
    [self presentViewController:alert animated:YES completion:nil];  

• 3､UIAlertController显示ActionSheet

  
  20161226165531740.png

   //显示弹出框列表选择  
    UIAlertController* alert = [UIAlertController alertControllerWithTitle:@"Title"  
                                                                   message:@"This is an Sheet."  
                                                            preferredStyle:UIAlertControllerStyleActionSheet];  
      
    UIAlertAction* cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel  
                                                          handler:^(UIAlertAction * action) {  
                                                              //响应事件  
                                                              NSLog(@"action = %@", action);  
                                                          }];  
    UIAlertAction* deleteAction = [UIAlertAction actionWithTitle:@"删除" style:UIAlertActionStyleDestructive  
                                                         handler:^(UIAlertAction * action) {  
                                                             //响应事件  
                                                             NSLog(@"action = %@", action);  
                                                         }];  
    UIAlertAction* saveAction = [UIAlertAction actionWithTitle:@"保存" style:UIAlertActionStyleDefault  
                                                         handler:^(UIAlertAction * action) {  
                                                             //响应事件  
                                                             NSLog(@"action = %@", action);  
                                                         }];  
    [alert addAction:saveAction];  
    [alert addAction:cancelAction];  
    [alert addAction:deleteAction];  
    [self presentViewController:alert animated:YES completion:nil];  

https://blog.csdn.net/shuai_summer/article/details/52441965
https://blog.csdn.net/weixin_37569048/article/details/80349155