UIAlertController弹出提示框

 #import "RootViewController.h"
 #import "RootView.h"
 #define kColor arc4random() % 256 / 255.0

 @interface RootViewController ()<UIAlertViewDelegate, UITextFieldDelegate>
 @property (nonatomic, strong) RootView *rootView;
 @property (nonatomic, strong) UIAlertController *colorAlert;
 @property (nonatomic, strong) UIAlertController *warningAlert;
 @end

 @implementation RootViewController

 - (void)loadView {
     self.rootView = [[RootView alloc] initWithFrame:[UIScreen mainScreen].bounds];
     self.view = self.rootView;
 }

 - (void)viewDidLoad {
     [super viewDidLoad];
     // Do any additional setup after loading the view.

     // 调用长按手势
     [self longPressGesture];
 }

 /**
  *  添加长按手势UILongPressGestureRecognizer
  */
 - (void)longPressGesture {
     // 创建长按手势对象 -- UIAlertController
         UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressGestureAction:)];

     // 创建长按手势对象 -- UIAlertView
 //    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressAction:)];
     // 给myView添加长按手势
     [self.rootView.myView addGestureRecognizer:longPress];
 }

 /**
  *  实现长按事件 -- UIAlertController
  *
  *  @param longPress 长按手势
  */
 - (void)longPressGestureAction:(UILongPressGestureRecognizer *)longPress {
     // 手势开始时
     if (longPress.state == UIGestureRecognizerStateBegan) {
         // 创建UIAlertController对象
         self.colorAlert = [UIAlertController alertControllerWithTitle:@"提示" message:@"改变颜色吗？" preferredStyle:UIAlertControllerStyleAlert];

         // 创建UIAlertAction对象
         // 确定按钮
         UIAlertAction *action1 = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
             // 实现给myView换随机背景颜色
             self.rootView.myView.backgroundColor = [UIColor colorWithRed:kColor green:kColor blue:kColor alpha:];
                         // 获取当前alert上所有的textField
                         NSArray *textFieldArr = self.colorAlert.textFields;
                         // 遍历获取到的textField数组，分别获取text
                         for (UITextField *field in textFieldArr) {
                             NSLog(@"text = %@", field.text);
                         }
         }];

         // 取消按钮
         UIAlertAction *action2 = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];
         // 将action添加到alert上
         [self.colorAlert addAction:action1];
         [self.colorAlert addAction:action2];

         // 添加TextField
         // weak 弱引用(内存问题)
         __weak RootViewController *rootVC = self;
                 [self.colorAlert addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
                     textField.placeholder = @"用户名";
                     textField.delegate = rootVC;

                 }];
                 [self.colorAlert addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
                     textField.placeholder = @"密码";
                     // 密文输入
                     textField.secureTextEntry = YES;
                     textField.delegate = rootVC;
                 }];

         // 模态推出
         [self presentViewController:self.colorAlert animated:YES completion:nil];

     }
 }

 /**
  *  实现textField代理方法，按return按钮回收键盘
  *
  *  @param textField 当前textField
  *
  *  @return
  */
 - (BOOL)textFieldShouldReturn:(UITextField *)textField {
     [textField resignFirstResponder];
     return YES;
 }

 /**
  *  实现长按事件 -- UIAlertView
  *
  *  @param longPress 长按手势
  */
 - (void)longPressAction:(UILongPressGestureRecognizer *)longPress {
     // 手势开始时
     if (longPress.state == UIGestureRecognizerStateBegan) {
         // 创建UIAlertView对象，并添加按钮
         UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"提示" message:@"改变颜色吗？" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定",@"按钮1", nil];
         /**
          *  设置alertView样式
          UIAlertViewStyleDefault = 0,  -- 默认，没有输入框
          UIAlertViewStyleSecureTextInput,  -- 密文输入
          UIAlertViewStylePlainTextInput,   -- 明文输入
          UIAlertViewStyleLoginAndPasswordInput -- 明文输入&密文输入结合，类似登录
          */
         [alertView setAlertViewStyle:UIAlertViewStyleDefault];
         // 显示alertView
         [alertView show];
     }
 }

 /**
  *  实现确定按钮点击事件
  *
  *  @param alertView   当前alertView
  *  @param buttonIndex 按钮下标
  */
 - (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
     if (buttonIndex == ) { // index为按钮添加顺序，取消 -- 0 、确定 -- 1 、按钮1 -- 2
         // 改变myView背景颜色
         self.rootView.myView.backgroundColor = [UIColor colorWithRed:kColor green:kColor blue:kColor alpha:];
     }

 }

 /**
  *  发生内存警告会自动调用
  */
 - (void)didReceiveMemoryWarning {
     [super didReceiveMemoryWarning];
     // Dispose of any resources that can be recreated.
     // 创建UIAlertController对象
     self.warningAlert = [UIAlertController alertControllerWithTitle:@"内存问题" message:nil preferredStyle:UIAlertControllerStyleAlert];
     // 创建UIAlertAction对象，类型为警告
     UIAlertAction *action = [UIAlertAction actionWithTitle:@"知道了" style:UIAlertActionStyleDestructive handler:nil];
     // 将action添加到alert上
     [self.warningAlert addAction:action];

     // 模态推出alert
     [self presentViewController:self.warningAlert animated:YES completion:nil];

 }

 @end