• iOS 8之后蘋果推薦我們使用的系統(tǒng)自帶的提示框是UIAlertController利虫。UIAlertController有兩種類型：
  typedef NS_ENUM(NSInteger, UIAlertControllerStyle) {
  UIAlertControllerStyleActionSheet = 0,
  UIAlertControllerStyleAlert
  } NS_ENUM_AVAILABLE_IOS(8_0);
  它的出現(xiàn)是為了替帶之前的UIAlertView和UIActionSheet兩個(gè)類舶吗。

• 下面介紹一下UIAlertController，順便有示例花枫。

  
  
  示例
• 1.登錄型的提示框
  - (IBAction)loginAlert:(UIButton *)sender {
  //獲取用戶當(dāng)前手機(jī)的系統(tǒng)版本
  [[UIDevice currentDevice] systemVersion];
  //當(dāng)前的系統(tǒng)版本大于等于8.0
  if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0) {
  UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"登錄" message:nil preferredStyle:UIAlertControllerStyleAlert];
  //1.初始化action
  UIAlertAction *action1 = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];
  UIAlertAction *action2 = [UIAlertAction actionWithTitle:@"確定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
  //找到輸入框?qū)ο?br> UITextField *usernameTF = alertController.textFields[0];
  UITextField *passwordTF = alertController.textFields[1];
  //取出用戶名和密碼
  NSString *username = usernameTF.text;
  NSString *password = passwordTF.text;
  NSLog(@"username:%@\npassword:%@",username,password);
  }];
  //2.添加動(dòng)作
  [alertController addAction:action1];
  [alertController addAction:action2];
  //添加輸入框
  [alertController addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
  textField.placeholder = @"請輸入用戶名";
  }];
  [alertController addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
  textField.placeholder = @"請輸入密碼";
  textField.secureTextEntry = YES;
  }];
  //顯示
  [self presentViewController:alertController animated:YES completion:nil];
  }
  }

• 2.UIAlertControllerStyleAlert和UIAlertControllerStyleActionSheet類型的，這里的示例是傳入一個(gè)類型，然后根據(jù)類型展示不同風(fēng)格山憨。
  - (void)btnTouchWithStyle:(UIAlertControllerStyle)style{
  /*
  preferredStyle:
  1.UIAlertControllerStyleActionSheet
  2.UIAlertControllerStyleAlert
  */
  if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0) {
  //iOS8以后才有的，替換了UIAlertView和UIActionSheet兩個(gè)類
  UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"分享" message:@"選擇分享的平臺(tái)" preferredStyle:style];
  UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
  NSLog(@"取消按鈕點(diǎn)擊");
  }];
  UIAlertAction *qqAction = [UIAlertAction actionWithTitle:@"分享到QQ" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
  NSLog(@"分享到QQ");
  }];
  UIAlertAction *weixinAction = [UIAlertAction actionWithTitle:@"分享到微信" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
  NSLog(@"分享到微信");
  }];

        //添加動(dòng)作
        [alertController addAction:cancelAction];
        [alertController addAction:qqAction];
        [alertController addAction:weixinAction];
        //顯示
        [self presentViewController:alertController animated:YES completion:nil];
    }else{
        NSLog(@"當(dāng)前的系統(tǒng)版本是小于8.0的,使用UIAlertView");
        UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"分享" message:@"選擇分享的平臺(tái)" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"確定", nil];
        [alertView show];
    }
    NSLog(@"------當(dāng)前的系統(tǒng)版本: %f---",[[[UIDevice currentDevice] systemVersion] floatValue]);
  }
  

示例代碼https://github.com/SPIREJ/SJUIAlertController