[Alert弹窗] This is a fast alert code for objc ! #alert

Alert.m

    // vim: syntax=objective-c
    UIAlertController * alertController = [UIAlertController alertControllerWithTitle:@"提示" message:nil 		preferredStyle:UIAlertControllerStyleAlert];
    
    UIAlertAction * cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];
    
    UIAlertAction * okAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        UITextField * textField = [alertController textFields].firstObject;
        if (![textField.text isEqualToString:@"新建文件"] && textField.text.length > 0) {
            
        }
    }];
    
    [alertController addAction:okAction];
    [alertController addAction:cancelAction];
    
    [alertController addTextFieldWithConfigurationHandler:^(UITextField *textField) {
        textField.placeholder = @"新建文件";
    }];
    
    [self presentViewController:alertController animated:YES completion:nil];