iphone - 警告 : Attempting to create USE_BLOCK_IN_FRAME variable with block that isn't in the frame

Question

什么意思？尝试遍历 Cocoa obj-c 中的文件时出现此错误。

我在网上找不到任何信息。

希望得到一些帮助。谢谢。

编辑

我一直在学习本教程 (link)预加载核心数据。我试过创建一个 Cococa 应用程序，也试过在我的 iPhone 应用程序中执行此操作。我认为我所有的核心数据设置代码都很好。每当调用此方法时，我都会收到 EXEC BAD ACCESS。

- (void)loadInitialData
{
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    // name ZSTREET_1   ZSTREET_2   ZCITY   ZZIP    ZURL    ZTEL    latitude    longitude

    NSString *path = [[NSBundle mainBundle] pathForResource:@"placesdata" ofType:@"txt"];

    NSString *fileString = [NSString stringWithContentsOfFile:path]; // reads file into memory as an NSString
    NSArray *lines = [fileString componentsSeparatedByString:@"\r"]; // each line, adjust character for line endings
    NSManagedObjectContext *context = [self managedObjectContext];
    for (NSString *line in lines)

    {   
        NSLog(line);

        NSString* string = [[NSString alloc] initWithUTF8String:line];
        NSArray *parts = [string componentsSeparatedByString:@"\t"];
        // value mapping
        NSString *name = [parts objectAtIndex:0];
        NSString *street_1 = [parts objectAtIndex:1];
        NSString *street_2 = [parts objectAtIndex:2];
        NSString *city = [parts objectAtIndex:3];
        NSString *zip = [parts objectAtIndex:4];
        NSString *url = [parts objectAtIndex:5];

        NSNumberFormatter * f = [[NSNumberFormatter alloc] init];
        [f setNumberStyle:NSNumberFormatterDecimalStyle];

        NSNumber *latitude = [f numberFromString:[parts objectAtIndex:6]];
        NSNumber *longitude = [f numberFromString:[parts objectAtIndex:7]];
        [f release];
        // splitting the parts to create the objects

        Place *place = (Place *)[NSEntityDescription insertNewObjectForEntityForName:@"Place" inManagedObjectContext:context];
        Address *address = (Address *)[NSEntityDescription insertNewObjectForEntityForName:@"Address" inManagedObjectContext:context];
        Location *location = (Location *)[NSEntityDescription insertNewObjectForEntityForName:@"Location" inManagedObjectContext:context];

        // set attributes
        [place setValue:name forKey:@"name"];
        [address setValue:street_1 forKey:@"street_1"];
        [address setValue:street_2 forKey:@"street_2"];
        [address setValue:city forKey:@"city"];
        [address setValue:zip forKey:"@zip"];
        [address setValue:url forKey:@"url"];
        [location setValue:latitude forKey:@"latitude"];
        [location setValue:longitude forKey:@"longitude"];

        // link the objects together
        [place setValue:address forKey:@"address"];
        [place setValue:location forKeyPath:@"address.location"];

        [string release];
    }
    NSLog(@"Done initial load");
    NSError *error; 
    if (![context save:&error]) {
        NSLog(@"Error saving: %@", error);
    }
    [context release];
    [pool drain];


}

Answer 1

对于使用完全不同的代码遇到此问题的其他人来说，这有点转移注意力。

警告来自调试器本身。调试器创建一个结构，其中包含系统中每个对象的信息。在 EXC_BAD_ACCESS 之后，它试图创建其中之一但无法创建。请注意，这是警告而不是错误，因此在这种情况下甚至可能会出现这种情况。

无论如何，与此相关的细节并不重要。您必须找到 EXC_BAD_ACCESS 的来源。一个常见的原因是试图在一个对象被释放后访问它。