Question

我有六种方法，我可以调用警报功能是否可以只调用一次警报功能，所以优化我的代码将是什么？这是我的代码：

// #import "ViewController.h"

//.h file 

.m file

@interface ViewController ()

@end

@implementation ViewController

@synthesize usernameText;
@synthesize emailText;
@synthesize passwordText;
@synthesize `repasswordTex`t;
@synthesize postalText;


- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

//for keyboard hide on textfield return
- (BOOL)textFieldShouldReturn:(UITextField *)theTextField {
    [theTextField resignFirstResponder];
    return YES;
}

//function for Name validation
- (BOOL) validatename:(NSString *) candidate{
    [postalText setKeyboardType:UIKeyboardTypeAlphabet];
    NSString *nameRegex = @"[A-Za-z]+";
    NSPredicate *codeTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",nameRegex];

    return [codeTest evaluateWithObject:candidate];
}

// email validation
- (BOOL) validateEmail: (NSString *) candidate {
    NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
    NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];

    return [emailTest evaluateWithObject:candidate];
}

// password code validation
- (BOOL)paswordvalidation:(NSString *) candidate
{

}

// postal code validation
- (BOOL) validatecode: (NSString *) candidate {
    NSString *codeRegex = @"^\d{5}(?:[-\s]\d{4})?$";
  NSPredicate *codeTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", codeRegex];

    return [codeTest evaluateWithObject:candidate];
}



 //method call on submit button
    - (IBAction)submitButn:(id)sender{



     //user name method call
            if(![self validatename:usernameText.text])
            {
               UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message:@"Please Ensure that you have insert character only"delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
                [alert show];
                return;
            }
//Email Method Call
    else if(![self validateEmail:emailText.text])
    {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message:@"Please Insert Valid Email Address"delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alert show];
        return;
    }
//Password validate Method Call

    else if([passwordText.text length] <6)//&& [repasswordText.text length] <= 6)
    {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message:@"Password should contain minimun 6 "delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alert show];
        return;
    }
     else if (![passwordText.text isEqualToString:repasswordText.text])
{
         UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message:@"confirm password should be same"delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
         [alert show];
         return;
     }



     //Postal Code Method Call
             else if(!([self validatecode:postalText.text] ||[postalText.text length] <6))

                {
                    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message:@"postal Code should cotain 5 "delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
                    [alert show];
                    return;
                }
    }

- (void)didReceiveMemoryWarning

    {
        [super didReceiveMemoryWarning];
        // Dispose of any resources that can be recreated.
    }

@end

Answer 1

编写此方法并调用您想要的地方。

-(void)showAlert :(NSString *)alertTitleString WithAlertMessage :(NSString *)alertMessage{
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:alertTitleString alertMessage delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
[alert show];

}

Answer 2

当然你可以，你甚至应该！你只需要将它重构为一个单独的方法，它将获得一些属性或（更好的选项）一个带有变量的对象，你可以从中为你想要显示的警报设置所需的值。

- (void)showAlertWithTitle:(NSString *)alertTitle andMessage:(NSString *)alertMessage {
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:alertTitle message:alertMessage delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
    [alert show];
}

这可能比一种更好的方式，但根据你的情况，你会做你想要的。 它只是从您的代码中提取方法。

Answer 3

可以在AppDelegate.h中添加此方法名称

-(void)alertFuction:(NSString *)title message:(NSString *)message

然后将此功能添加到AppDelegate.m

-(void)alertFuction:(NSString *)title message:(NSString *)message
{
        UIAlertView *alert = [[UIAlertView alloc]initWithTitle:title message:message delegate:self cancelButtonTitle:@"Done" otherButtonTitles:nil, nil];
        [alert show];
        [alert release];
        alert = nil;

        [delegate.window setUserInteractionEnabled:YES];

}

然后在任何其他视图控制器中放置此项 .h文件

@class AppDelegate

.m文件

#import AppDelegate

在viewDidload方法

中

AppDelegate *delegate = (AppDelegate *)[[UIApplication sharedApplication]delegate];

然后您可以通过

调用警报方法

[delegate alertFuction:@"title" message:@"message"];

Answer 4

带有类方法的通用辅助类如何涵盖许多常见场景（您可能显然想要重新配置/添加）：

@implementation AlertHelper

+ (UIAlertView *)showAlertWithMessage:(NSString *)message
{
    [AlertHelper showAlertWithTitle:nil message:message delegate:nil cancelButton:NSLocalizedString(@"OK", nil) otherButton:nil];
}

+ (UIAlertView *)showAlertWithTitle:(NSString *)title message:(NSString *)message
{
    [AlertHelper showAlertWithTitle:title message:message delegate:nil cancelButton:NSLocalizedString(@"OK", nil) otherButton:nil];
}

+ (UIAlertView *)showAlertWithTitle:(NSString *)title message:(NSString *)message delegate:(id < UIAlertViewDelegate >)delegate cancelButton:(NSString *)cancel otherButton:(NSString *)other
{
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:title message:message delegate:delegate cancelButtonTitle:cancel otherButtonTitles:(other ? @[ other ] : nil)];
    [alert show];
}

@end

请注意，只有在需要时才会返回警报视图（假设您需要在操作完成后自动删除警报视图）。

我有七种方法可以调用警报功能，是否可以只调用一次警报功能，以便优化我的代码

4 个答案: