iOS UI-AlertView（警示框）和ActionSheet（选择框、操作表单）

 #import "ViewController.h"

 @interface ViewController ()<UIAlertViewDelegate,UIActionSheetDelegate>

 @end

 @implementation ViewController

 #pragma mark - 生命周期
 - (void)viewDidLoad {
     [super viewDidLoad];
     // 创建展示AlertView的按钮
     UIButton *btn = [UIButton buttonWithType:UIButtonTypeSystem];
     [btn setTitle:@"AlertView" forState:UIControlStateNormal];
     [btn setFrame:CGRectMake(, , , )];
     //btn.center =self.view.center;
     [btn setBackgroundColor:[UIColor orangeColor]];
     [btn addTarget:self action:@selector(showAlert) forControlEvents:UIControlEventTouchUpInside];

     // 创建展示ActionSheet的按钮
     [self.view addSubview:btn];
     UIButton *btn1 = [UIButton buttonWithType:UIButtonTypeSystem];
     [btn1 setTitle:@"ActionSheet" forState:UIControlStateNormal];
     [btn1 setFrame:CGRectMake(, , , )];
     [btn1 setBackgroundColor:[UIColor redColor]];
     [btn1 addTarget:self action:@selector(showActionSheet) forControlEvents:UIControlEventTouchUpInside];
     [self.view addSubview:btn1];

 }
 #pragma mark - 关联事件

 #pragma mark - 警示框
 - (void)showAlert
 {
     /*

      UIAlertView警示框控件
      注意
      不用创建全局的Alert
      尽量不要关联逻辑操作，如果关联实现协议：UIAlertViewDelegate以及里面的协议方法

      */
     UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"错误"
                                                     message:@"网络连接失败"
                                                    delegate:self
                                           cancelButtonTitle:@"好的"
                                           otherButtonTitles:@"方案1",@"方案2",@"方案3", nil];

     [alert show];
 }
 #pragma mark - 选择框
 - (void)showActionSheet
 {
     /*

      UIActionSheet 选择框
      注意
      不用创建全局的UIActionSheet
      尽量关联逻辑操作，如果关联实现协议：UIActionSheetDelegate以及里面的协议方法

      */

     UIActionSheet *action = [[UIActionSheet alloc] initWithTitle:@"请选择你的节操充值额度"
                                                         delegate:self
                                                cancelButtonTitle:@"算了，不要了"
                                           destructiveButtonTitle:@"18.00RMB"
                                                otherButtonTitles:@"19.00RMB",@"20.00RMB",@"21.00RMB", nil];

     [action showInView:self.view];
 }

 #pragma mark - 选择框代理方法
 - (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
 {
     switch (buttonIndex) {
         case :
             NSLog(@"第一种情况");
             break;
         case :
             NSLog(@"第二种情况");
             break;
         case :
             NSLog(@"第三种情况");
             break;
         case :
             NSLog(@"第四种情况");
             break;
         case :
             NSLog(@"第五种情况");
             break;

         default:
             break;
     }
 }
 #pragma mark - 警示框代理方法
 - (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
 {
     switch (buttonIndex) {
         case :
             NSLog(@"序号为0");
             break;
         case :
             NSLog(@"序号为1");
             break;
         case :
             NSLog(@"序号为2");
             break;
         case :
             NSLog(@"序号为3");
             break;

         default:
             break;
     }
 }

 - (void)didReceiveMemoryWarning {
     [super didReceiveMemoryWarning];
     // Dispose of any resources that can be recreated.
 }

 @end

 //
 //  ViewController.m
 //  IOS_0226_UIAlertController
 //
 //  Created by ma c on 16/2/26.
 //  Copyright © 2016年 博文科技. All rights reserved.
 //

 #import "ViewController.h"

 @interface ViewController ()
 @property (weak, nonatomic) IBOutlet UIButton *btnClick;

 @end

 @implementation ViewController

 /*
  UIPresentationController ->管理所有Modal出来的控制器

  1.管理所有通过presentViewController方法显示出来的控制器
  2.只要调用了presentViewController方法就会创建UIPresentationController
  3.管理/监听切换控制器的过程
  4.属性
  //当前控制器
  @property(nonatomic, strong, readonly) UIViewController *presentingViewController;
  //切换的控制器
  @property(nonatomic, strong, readonly) UIViewController *presentedViewController;
  //切换的控制器视图
  - (nullable UIView *)presentedView;

  5.UIViewController属性

  @property (nonatomic,readonly) UIPresentationController *presentationController
  @property (nonatomic,readonly) UIPopoverPresentationController *popoverPresentationController

  这两个属性指向UIPresentationController

  */

 - (void)viewDidLoad {
     [super viewDidLoad];
     self.view.backgroundColor = [UIColor cyanColor];

 }

 - (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
 {
     //[self createAlertVC];
     [self createPopoverPresentationVC];
 }

 - (void)createAlertVC
 {
     //警示框
     UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"提示" message:@"好久不见，你又不乖了。" preferredStyle:UIAlertControllerStyleAlert];
     //添加按钮
     UIAlertAction *action = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDestructive handler:^(UIAlertAction * _Nonnull action) {
         NSLog(@"点击了确定按钮");
     }];

     [alert addAction:action];

     [alert addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
         NSLog(@"点击了取消按钮");
     }]];

     //添加文本框
     [alert addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
         textField.borderStyle = UITextBorderStyleRoundedRect;
         textField.textColor = [UIColor redColor];
         textField.text = @"";
         [textField addTarget:self action:@selector(uernameChange:) forControlEvents:UIControlEventEditingChanged];

     }];
     [alert addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
         textField.borderStyle = UITextBorderStyleRoundedRect;

         textField.secureTextEntry = YES;
         textField.text = @"";
     }];
     [self presentViewController:alert animated:nil completion:nil];
 }

 - (void)uernameChange:(UITextField *)textField
 {
     NSLog(@"%@",textField.text);
 }

 - (void)createPopoverPresentationVC
 {
     UIAlertController *actionSheet = [UIAlertController alertControllerWithTitle:@"提示" message:@"请选择操作" preferredStyle:UIAlertControllerStyleActionSheet];
     //设置展示形式
     actionSheet.modalTransitionStyle = UIModalPresentationPopover;
     self.popoverPresentationController.sourceView = self.btnClick;
     self.popoverPresentationController.sourceRect = self.btnClick.bounds;

     UIAlertAction *action = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDestructive handler:^(UIAlertAction * _Nonnull action) {
         NSLog(@"点击了确定按钮");
     }];
     [actionSheet addAction:action];

     [actionSheet addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
         NSLog(@"点击了取消按钮");
     }]];

     [self presentViewController:actionSheet animated:nil completion:nil];

 }

 @end