[ios]alert消息

1。Alert View

UIAlertView * al = [[UIAlertView alloc]initWithTitle:userInfo message:nil delegate:self cancelButtonTitle:@"✅" otherButtonTitles:nil];
 [al show];

2.alert controller

UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"Warn" message:@"The logout operation failed" preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *sureAction = [UIAlertAction actionWithTitle:@"Yes" style:UIAlertActionStyleDefault handler:nil];
[alert addAction:sureAction];
[self presentViewController:alert animated:YES completion:nil];

 3.添加点击事件

UIAlertAction *sureAction = [UIAlertAction actionWithTitle:@"Yes" style:UIAlertActionStyleDefault handler:^(UIAlertAction *sureAction){
                
                NSLog(@"Alert dialog sure action clicked");
                if (_buttonDialog == 0) { //disable enable_wifi_switch yes
                    _buildGuestWifi = [[HwGuestWifiInfo alloc] init];
                    _buildGuestWifi.enabled = false;
                    [self setGuestWifiInfo:_buildGuestWifi];
                    [self getGuestWifiInfo];
                    
                }else if (_buttonDialog ==1){
                    [self save];
                }
            }];

4.带输入框：

UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"BlackList" message:@"Add black list" preferredStyle:UIAlertControllerStyleAlert];

//addTextFieldWithConfigurationHandler（关键）
    [alert addTextFieldWithConfigurationHandler:^(UITextField *textField){
        textField.placeholder = @"blacklist mac";
    }];
    UIAlertAction *sureAction = [UIAlertAction actionWithTitle:@"Yes" style:UIAlertActionStyleDefault handler:^(UIAlertAction *sureAction){
//获取文本框对象，读取值
        UITextField *addBlacklistTv = alert.textFields.firstObject;
        
        [self add2Blacklist:addBlacklistTv.text];
        
    }];
    [alert addAction:sureAction];
    [self presentViewController:alert animated:YES completion:nil];

参考：http://www.cocoachina.com/ios/20141126/10320.html