多个错误显示在同一个 UIAlertView

Posted 2023-02-23

【中文标题】多个错误显示在同一个 UIAlertView

【英文标题】：Multiple errors show in the same UIAlertView

【发布时间】：2014-07-20 10:48:55

【问题描述】：

我搜索了网络但没有找到答案。 在我的应用中，我有一个用户注册，所以我必须在接受用户之前检查输入文本字段。

这是我的代码：

- (IBAction)continueRegister:(id)sender 
    if (!termsOfUseChecked)
        NSLog(@"Error");
        else
            NSLog(@"Success");
    if ([_regTelephoneNumber.text length] > 10) 
        [self initWithTitle:@"error" andMessage:@"bla bla" andCancelButton:@"ok"];
    

    if ([_regUserEmail.text rangeOfString:@"@"].location == NSNotFound)
        [self initWithTitle:@"error" andMessage:@"bla bla" andCancelButton:@"ok"];
    
    if (![_regPassword.text isEqualToString:_regConfirmPassword.text]) 
     [self initWithTitle:@"error" andMessage:@"bla bla" andCancelButton:@"ok"];
    



-(void)initWithTitle:(NSString*)title andMessage:(NSString*)message andCancelButton:(NSString*)cancelButton;

    UIAlertView *alert = [[UIAlertView alloc]initWithTitle:title message:message delegate:self cancelButtonTitle:cancelButton otherButtonTitles:nil, nil];
    [alert show];
 

但如果发生多个错误，用户会收到很多弹出窗口。 有什么方法可以在同一个 UIAlertview 中显示所有错误？

【参考方案1】：

您可以使用NSArray

- (IBAction)continueRegister:(id)sender 
    NSMutableArray *errorArr = [@[] mutableCopy];
    if (!termsOfUseChecked)
        NSLog(@"Error");
    else
        NSLog(@"Success");
    if ([_regTelephoneNumber.text length] > 10) 
        [errorArr addObject:@"Telephone Bla"];
    

    if ([_regUserEmail.text rangeOfString:@"@"].location == NSNotFound)
        [errorArr addObject:@"UserEmail Bla"];
    
    if (![_regPassword.text isEqualToString:_regConfirmPassword.text]) 
        [errorArr addObject:@"Password Bla"];
    

    if([errorArr count]==0)
        [self initWithTitle:@"No Error" andMessage:@"Success" andCancelButton:@"ok"];
    
    else if([errorArr count] == 1)

        [self initWithTitle:@"Error" andMessage:errorArr[0] andCancelButton:@"ok"];
    
    else if([errorArr count] >1)

        [self initWithTitle:@"Multiple Error" andMessage[errorArr componentsJoinedByString:@","] andCancelButton:@"ok"];
    

【参考方案2】：

我只是连接字符串并在错误检查结束时显示它们：

- (IBAction)continueRegister:(id)sender 
NSMutableString * titleString= @"";
NSMutableString * mesageString = @"";


if (!termsOfUseChecked)
    NSLog(@"Error");
    else
        NSLog(@"Success");
if ([_regTelephoneNumber.text length] > 10) 
[titleString appendString: @"an error title; "];
[messageString appendString: @"an error message; "]


if ([_regUserEmail.text rangeOfString:@"@"].location == NSNotFound)
[titleString appendString: @"an error title; "];
[messageString appendString: @"an error message; "]

if (![_regPassword.text isEqualToString:_regConfirmPassword.text]) 
[titleString appendString: @"an error title; "];
[messageString appendString: @"an error message; "]

if(![titleString isEqualToString: @""])
[self initWithTitle:titleString andMessage:messageString andCancelButton:@"ok"];

您还可以通过在需要换行符的位置添加“\n”来使用 newLineCharacters 格式化 messageString。