对话框

#pragma mark - 加载视图
- (void)viewDidLoad {
[super viewDidLoad];

//初始化两个按钮
self.btnShow = [UIButton buttonWithType:UIButtonTypeRoundedRect];
self.btnShow.frame = CGRectMake(20, 100, 100, 50);
//设置标题
[self.btnShow setTitle:@"start" forState:UIControlStateNormal];
//添加开启事件方法
[self.btnShow addTarget:self action:@selector(shows:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:self.btnShow];

}
#pragma mark - UIAlertViewDelegate
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
//获得当前索引按钮的标题
NSString *title = [alertView buttonTitleAtIndex:buttonIndex];
NSLog(@"%@",title);
}
#pragma mark - show
-(IBAction)shows:(id)sender{
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"My Title" message:@"show to you" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"OK",@"Other", nil];
[alert show];
}

#pragma mark - show
-(IBAction)shows:(id)sender{
//    UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"My Title" message:@"show to you" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"OK",@"Other", nil];
//    [alert show];

UIAlertController* alert = [UIAlertController alertControllerWithTitle:nil  //nil  这一项就会隐藏
message:@"This is an alert." //nil  这一项就会隐藏
preferredStyle:UIAlertControllerStyleAlert];
//    typedef enum UIAlertControllerStyle: NSInteger {
//        UIAlertControllerStyleActionSheet = 0, //底端出现的  就是 UiActionSheet
//        UIAlertControllerStyleAlert            //对话框
//    } UIAlertControllerStyle;

UIAlertAction* OKAction = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault
handler:^(UIAlertAction * action) {
NSLog(@"%@",action.title);
}];
UIAlertAction* CancelAction = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleDefault
handler:^(UIAlertAction * action) {
NSLog(@"%@",action.title);
}];
//addAction  添加
[alert addAction:OKAction];
[alert addAction:CancelAction];
[self presentViewController:alert animated:YES completion:nil];
}