多个错误显示在同一个 UIAlertView答案

【问题标题】：Multiple errors show in the same UIAlertView多个错误显示在同一个 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？

【问题讨论】：

标签： ios objective-c uialertview uialertviewdelegate

【解决方案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"];
    }

}

【讨论】：

【解决方案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。

【讨论】：