objective-c - 单击 UIAlertview 上的按钮后，iOS 应用程序立即崩溃

Question

在用户单击 UIAlertview 上的按钮后，我尝试使用电话应用程序调用号码。电话应用程序确实打开了，但原始应用程序在单击 UIAlertview 上的按钮后立即崩溃。有人知道原因吗？我确实尝试确保我发布了所有应该发布的内容。谢谢!下面是代码:

-(IBAction)dialButtonPressed:(UIButton *)numberButton
    {
    if ([company isEqualToString:@"Not Found"]==true){
            message = [[UIAlertView alloc] initWithTitle:@"Sorry"
                                                              message:@"No replace number found. Would you like to dial anyway?"
                                                             delegate:self
                                                    cancelButtonTitle:@"No"
                                                    otherButtonTitles:@"Yes", nil];
            message.tag = 0;
            if(phoneLinkString)
            {
                [phoneLinkString release];
                phoneLinkString = nil;
            }
            [message show];
            [message autorelease];
            phoneLinkString = [[NSString stringWithFormat:@"tel:%@",replace]retain];


        }
    }

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
    {
        NSString *title = [alertView buttonTitleAtIndex:buttonIndex];
        [self release];

        message = nil;


        if(message.tag == 0 && buttonIndex == 1){
            NSURL *phoneLinkURL = [NSURL URLWithString:phoneLinkString];
            [[UIApplication sharedApplication] openURL:phoneLinkURL];
        }

- (void)dealloc {
    [phoneNumberString release];
    [phoneNumberLabel release];
    [self release];
    [message release];
    [super dealloc];
}

最新代码

    -(IBAction)dialButtonPressed:(UIButton *)numberButton
            {
            if ([company isEqualToString:@"Not Found"]==true){
                    message = [[UIAlertView alloc] initWithTitle:@"Sorry"
                                                                      message:@"No replace number found. Would you like to dial anyway?"
                                                                     delegate:self
                                                            cancelButtonTitle:@"No"
                                                            otherButtonTitles:@"Yes", nil];
                    message.tag = 1;
                    if(phoneLinkString)
                    {
                        [phoneLinkString release];
                        phoneLinkString = nil;
                    }
                    [message show];
                    [message autorelease];
                    phoneLinkString = [[NSString stringWithFormat:@"tel:%@",replace]retain];


                }
        }
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
        {

            if(message.tag == 1 && buttonIndex == 1){

                NSURL *phoneLinkURL = [NSURL URLWithString:phoneLinkString];
                [[UIApplication sharedApplication] openURL:phoneLinkURL];
                message = nil;
            }
        }
- (void)dealloc {
            [phoneNumberString release];
            [phoneNumberLabel release];
            [super dealloc];
        }

但点击 UIAlertview 上的按钮后它仍然崩溃。错误是 0x3beb85b0: ldr r3, [r4, #8] EXC_BAD_ACCESS (code=1, address=0x7269634f) 任何帮助将不胜感激。谢谢!

Answer 1

问题可能是您在 if 语句之前将警报设置为 nil。试着把它放在后面。