Question

我正在做一些非常简单的事情。试图pushViewController。它在iPhone上运行良好，但在iPad上，它崩溃了！ SIGABRT：

libsystem_kernel.dylib`__pthread_kill:
0x35d85324:  mov    r12, #328
0x35d85328:  svc    #128
0x35d8532c:  blo    0x35d85344                ; __pthread_kill + 32
0x35d85330:  ldr    r12, [pc, #4]             ; __pthread_kill + 24
0x35d85334:  ldr    r12, [pc, r12]
0x35d85338:  b      0x35d85340                ; __pthread_kill + 28
0x35d8533c:  stmibeqr4, {r5, r6, r7, r10, r11}
0x35d85340:  bx     r12
0x35d85344:  bx     lr

有什么想法？谢谢！

Principal *cvc;

NSString *deviceType = [UIDevice currentDevice].model;
if([deviceType isEqualToString:@"iPhone"] || [deviceType isEqualToString:@"iPod touch"]) {
    cvc = [[Principal alloc] initWithNibName:@"Principal" bundle:nil];
} else {
    cvc = [[Principal alloc] initWithNibName:@"Principal_iPad" bundle:nil];
}

[cvc setImg:flippedImage];

if([deviceType isEqualToString:@"iPhone"] || [deviceType isEqualToString:@"iPod touch"]) {

    [self.navigationController pushViewController:cvc animated:YES];

} else {

    [self.navigationController pushViewController:cvc animated:YES];

}

[cvc release];

Answer 1

我认为检查UI界面成语更容易：

    Principal *cvc;
    if(UI_USER_INTERFACE_IDIOM() = UIUserInterfaceIdiomPhone) {
        cvc = [[Principal alloc] initWithNibName:@"Principal" bundle:nil];
    } else {
        cvc = [[Principal alloc] initWithNibName:@"Principal_iPad" bundle:nil];
    }
    [cvc setImg:flippedImage];
    [self.navigationController pushViewController:cvc animated:YES];
    [cvc release];

此外，在上一个if语句的两种情况下，您都在执行相同的操作，因此您可以像在代码中一样删除它。

为了帮助你，我需要看到崩溃前抛出的实际异常文本。

我可以想象问题是，self.navigationController是在iPhone上定义的，而不是在iPad上定义的，或者用于iPad的初始化程序返回nil VC并推送{{1}视图控制器将抛出异常。

Answer 2

这有问题;

Principal *cvc;
NSString *deviceType = [UIDevice currentDevice].model;
if([deviceType isEqualToString:@"iPhone"] || [deviceType isEqualToString:@"iPod touch"]) {
    cvc = [[Principal alloc] initWithNibName:@"Principal" bundle:nil];
} else {
    cvc = [[Principal alloc] initWithNibName:@"Principal_iPad" bundle:nil];
    // This should be allocated with the class Principal_iPad not Principal.
}

应该是这样的，

NSString *deviceType = [UIDevice currentDevice].model;
if([deviceType isEqualToString:@"iPhone"] || [deviceType isEqualToString:@"iPod touch"]) {
    Principal *cvc = [[Principal alloc] initWithNibName:@"Principal" bundle:nil];
    [cvc setImg:flippedImage];
    [self.navigationController pushViewController:cvc animated:YES];
    [cvc release]
} else {
    Principal_iPad *cvc = [[Principal_iPad alloc] initWithNibName:@"Principal_iPad" bundle:nil];
    [cvc setImg:flippedImage];
    [self.navigationController pushViewController:cvc animated:YES];
    [cvc release]
}

Answer 3

获取实际例外您必须设置NSZombieEnabled。要设置NSZombieEnabled转到产品 - >编辑方案 - ＆gt;参数参数，您可以在此处找到“环境变量”，点击+符号并添加NSZombieEnabled并选中旁边的复选框。然后你可以看到异常。我认为问题可能与NavigationController无关。它可能在PricipalViewController中，只需在PrincipalViewController中的ViewDidLoad放置breakPoints来检查它。

Answer 4

你的xib可能有些问题，例如一些不存在的连接（通常在你复制xib元素并忘记删除选择器时出现等）。您可以通过将以下代码添加到appDelegate来找到堆栈跟踪：

void uncaughtExceptionHandler(NSException *exception) {
   NSLog(@"CRASH: %@", exception);
   NSLog(@"Stack Trace: %@", [exception callStackSymbols]);
   // Internal error reporting
}

上述方法应该是appDelegate.m

中的第一个方法

然后，添加NSSetUncaughtExceptionHandler(&uncaughtExceptionHandler);作为application:didFinishLaunchingWithOptions:方法的第一行，如下所示：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    NSSetUncaughtExceptionHandler(&uncaughtExceptionHandler);//should be the first line
    ....
    ....
}

pushViewController在iPad上崩溃了

4 个答案: