Question

我是iOS的新手。

我正在处理alertviews。这是我的代码。这里有2个警报视图：successfulallert和unsuccessfulallert用于登录页面。我也在这里使用alertview委托，它将适用于两个警报视图，但我想只为成功的alertview工作，并且只应为成功的alertview进行导航。如果有人知道这一点，请帮助我。

NSString *responseOfResult = [[NSString alloc]initWithString:[result response]];
    NSRange match;
    //  NSLog(@"string= %@", str);
    match = [responseOfResult rangeOfString: @"successful"];
    if(match.location == NSNotFound)
    {
        UIAlertView *unsuccessfulAllert = [[UIAlertView alloc]
                               initWithTitle:@"Alert"
                               message:responseOfResult
                               delegate:self
                               cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
        [unsuccessfulAllert show];

    }
    else {
        UIAlertView *successfulAllert = [[UIAlertView alloc]
                               initWithTitle:@"Message" message:@"Login successful." delegate:self cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
        [successfulAllert show];
     }
-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
    if(buttonIndex == 0){
        [[self navigationController]pushViewController:registerUserScreen animated:YES];
    }
}

Answer 1

为什么不将“ON”作为取消按钮标题？一切都将自动处理。

UIAlertView *successfulAllert = [[UIAlertView alloc]
                               initWithTitle:@"Message" message:@"Login successful." delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
        [successfulAllert show];

Answer 2

-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
    if(buttonIndex == 0){
        //POP here with this:
        [self.navigationController pushViewController:addItemView animated:NO];

    }
}

Answer 3

将标记添加到两个警报视图并检查警报视图委托中的标记。

示例代码：

NSString *responseOfResult = [[NSString alloc]initWithString:[result response]];
NSRange match;
//  NSLog(@"string= %@", str);
match = [responseOfResult rangeOfString: @"successful"];
if(match.location == NSNotFound)
{
    UIAlertView *unsuccessfulAllert = [[UIAlertView alloc]
                           initWithTitle:@"Alert"
                           message:responseOfResult
                           delegate:self
                           cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
    [unsuccessfulAllert setTag:1];
    [unsuccessfulAllert show];

}
else {
    UIAlertView *successfulAllert = [[UIAlertView alloc]
                           initWithTitle:@"Message" message:@"Login successful." delegate:self cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
    [successfulAllert setTag:2];
    [successfulAllert show];
 }

-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
if(alertView.tag==2 && buttonIndex == 0){
    [[self navigationController]pushViewController:registerUserScreen animated:YES];
}

Answer 4

是的，委托对两个alertview都有效，但你可以为每个alertview对象分配一个标签，并在委托中检查标签，然后如果特定的AlertView onject的标签匹配则执行事件。如果你需要代码，我将提供。

Answer 5

NSString *responseOfResult = [[NSString alloc]initWithString:[result response]];
NSRange match;
//  NSLog(@"string= %@", str);
match = [responseOfResult rangeOfString: @"successful"];
if(match.location == NSNotFound)
{
    UIAlertView *unsuccessfulAllert = [[UIAlertView alloc]
                           initWithTitle:@"Alert"
                           message:responseOfResult
                           delegate:self
                           cancelButtonTitle:nil otherButtonTitles:@"OK", nil];

    [unsuccessfulAllert setTag:1];

    [unsuccessfulAllert show];

}
else {
    UIAlertView *successfulAllert = [[UIAlertView alloc]
                           initWithTitle:@"Message" message:@"Login successful." delegate:self cancelButtonTitle:nil otherButtonTitles:@"OK", nil];

    [successfulAllert setTag:2];
    [successfulAllert show];
 }
-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
if(alertView.tag == 2)
{
    [[self navigationController]pushViewController:registerUserScreen animated:YES];
}
 else
 {
    //[[self navigationController]pushViewController:registerUserScreen animated:NO];
     // OR
     return;
 }
}

Answer 6

您可以通过多种方式更正代码，第一种也是非常常见的方法是使用tag的{{1}}属性（整数）。由于UIView继承自UIAlertview，因此它具有UIView属性，因此每次要创建警报（或视图）时，请设置标记并检查您的条件如下：

tag

然后知道警报正在调用回调：

...
alert.tag=1;
[alert show];

另一种方式，在你的情况下，可能是：

-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
  if(alertView.tag==theTagOfYourAlert){
     //do your stuff
   }
}

Answer 7

对于登录状态更新等内容，您可能希望“登录成功”消息自动消失。试试这个：

https://github.com/camclendenin/flashbox

这很好用，对于像这样的情况派上用场。此外，您无需处理UIAlertViews所涉及的所有混乱。

单击uialertview中的按钮时如何关闭警报视图

7 个答案: