OC

+ (void)showAlertWithTitle:(nullable NSString *)title;
+ (void)showAlertWithTitle:(nullable NSString *)title message:(nullable NSString *)message;
+ (void)showAlertWithTitle:(nullable NSString *)title message:(nullable NSString *)message cancelButtonTitle:(nullable NSString *)cancelButtonTitle;
+ (void)showAlertWithTitle:(nullable NSString *)title message:(nullable NSString *)message cancelButtonTitle:(nullable NSString *)cancelButtonTitle actionHandler:(nullable void (^)(NSInteger buttonIndex))actionHandler;
+ (void)showAlertWithTitle:(nullable NSString *)title message:(nullable NSString *)message cancelButtonTitle:(nullable NSString *)cancelButtonTitle otherButtonTitles:(nullable NSArray *)otherButtonTitles actionHandler:(nullable void (^)(NSInteger buttonIndex))actionHandler;



+ (void)showAlertWithTitle:(nullable NSString *)title
{
    [self showAlertWithTitle:title message:nil];
}

+ (void)showAlertWithTitle:(nullable NSString *)title message:(nullable NSString *)message
{
    [self showAlertWithTitle:title message:message cancelButtonTitle:nil];
}

+ (void)showAlertWithTitle:(nullable NSString *)title message:(nullable NSString *)message cancelButtonTitle:(nullable NSString *)cancelButtonTitle
{
    [self showAlertWithTitle:title message:message cancelButtonTitle:cancelButtonTitle actionHandler:nil];
}

+ (void)showAlertWithTitle:(nullable NSString *)title message:(nullable NSString *)message cancelButtonTitle:(nullable NSString *)cancelButtonTitle actionHandler:(nullable void (^)(NSInteger buttonIndex))actionHandler
{
    [self showAlertWithTitle:title message:message cancelButtonTitle:cancelButtonTitle otherButtonTitles:nil actionHandler:actionHandler];
}

+ (void)showAlertWithTitle:(nullable NSString *)title message:(nullable NSString *)message cancelButtonTitle:(nullable NSString *)cancelButtonTitle otherButtonTitles:(nullable NSArray *)otherButtonTitles actionHandler:(void (^)(NSInteger buttonIndex))actionHandler
{
    cancelButtonTitle = cancelButtonTitle ? cancelButtonTitle : @"取消";
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:title message:message preferredStyle:UIAlertControllerStyleAlert];
    
    __weak typeof(alertController) weakController = alertController;
    UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:cancelButtonTitle style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
        NSInteger index = [weakController.actions indexOfObject:action];
        if (actionHandler) {
            actionHandler(index);
        }
    }];
    [alertController addAction:cancelAction];
    
    for (NSString *title in otherButtonTitles) {
        UIAlertAction *action = [UIAlertAction actionWithTitle:title style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
            if (actionHandler) {
                NSInteger index = [weakController.actions indexOfObject:action];
                actionHandler(index);
            }
        }];
        [alertController addAction:action];
    }
    
    UIViewController *curVC = [(UIWindow *)[UIApplication sharedApplication].keyWindow visibleViewController];
    [curVC presentViewController:alertController animated:YES completion:nil];
}

Swift

typealias action1Block = (() -> Void)?

typealias action2Block = (() -> Void)?

func showAlertViewWithOneContrl(_ alertInfo: (String?, String?, UIAlertController.Style),
                                action1info: (String, UIAlertAction.Style)?,
                                action1Block: action1Block) {
    showAlertViewWith(alertInfo, action1info: action1info, action2info: nil, action1Block: {
        if let ac1Block = action1Block {
            ac1Block()
        }
    }, action2Block: nil)
}


func showAlertViewWith(_ alertInfo: (String?, String?, UIAlertController.Style),
                       action1info: (String, UIAlertAction.Style)?,
                       action2info: (String, UIAlertAction.Style)?,
                       action1Block: action1Block,
                       action2Block: action2Block) {
    let alertViewController = UIAlertController(title: alertInfo.0, message: alertInfo.1, preferredStyle: alertInfo.2)
    if let infoLeft = action1info {
        let alertAction1 = UIAlertAction(title: infoLeft.0, style: infoLeft.1) { (action1) in
            if let ac1Block = action1Block {
                ac1Block()
            }
        }
        alertViewController.addAction(alertAction1)
    }
    if let infoRight = action2info {
        let alertAction2 = UIAlertAction(title: infoRight.0, style: infoRight.1) { (action2) in
            if let ac2Block = action2Block {
                ac2Block()
            }
        }
        alertViewController.addAction(alertAction2)
    }
    UIViewController.top()?.present(alertViewController, animated: true, completion: nil)
}