UIAlertView和UIAlertViewController

#import "ViewController.h"

@interface ViewController ()<UIAlertViewDelegate>

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}
- (IBAction)didClickButtonAction:(UIButton *)sender {
    
    //版本判断
    float version = [UIDevice currentDevice].systemVersion.floatValue;
    if (version < 8.0) {
        
        //iOS8.0以前UIAlertView,用show展示
            UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"提示" message:@"密码错误" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定",@"孟德峰",@"原溢凯", nil];
            //弹出alertView
            [alertView show];
        
    }else{
        //iOS8.0以后UIAlertController,用模态展示
        UIAlertController *alertC = [UIAlertController alertControllerWithTitle:@"提示" message:@"密码错误" preferredStyle:UIAlertControllerStyleActionSheet];
        //添加点击按钮
        [alertC addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
            NSLog(@"点击确定");
        }]];
        [self presentViewController:alertC animated:YES completion:nil];
    }
    
}
//代理方法,判断点击了那个按钮
-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    NSLog(@"%ld",buttonIndex);
}