我最近开始了一个在 Mountain Lion 上运行的 Xcode 4.4 新项目。我有一个名为 的类TSTopChartManager，它位于我项目的 MainMenu nib 中。我还有一个名为 的数据容器PodcastShow，它基本上有一堆属性和一个从 Internet 获取图像的方法。这TSTopChartManger看起来像......
.h 文件...
#import <Foundation/Foundation.h>
#import "PodcastShow.h"
@interface TSTopChartManager : NSObject
@property NSMutableArray *topPodcasts;
@end
.m 文件：
#import "TSTopChartManager.h"
@implementation TSTopChartManager
-(id) init
{
if (self)
{
/*PodcastShow *myShow = [[PodcastShow alloc] init];
myShow.title = @"This is a show";*/
}
return self;
}
@end
现在，它运行完美。但是当我像这样删除init方法中的块注释时......
if (self)
{
PodcastShow *myShow = [[PodcastShow alloc] init];
myShow.title = @"This is a show";
}
我收到以下错误..
Undefined symbols for architecture x86_64:
"_OBJC_CLASS_$_PodcastShow", referenced from:
objc-class-ref in TSTopChartManager.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
我不知道为什么会这样。我以前没有见过这样的错误。我将如何解决它？有任何想法吗？谢谢！
对于好奇：
PodcastShow在我的应用程序中被视为数据容器。它有一些属性和两种方法。如下PodcastShow所示：
。H：
#import <Foundation/Foundation.h>
@interface PodcastShow : NSObject
{
NSString *title;
NSString *network;
NSString *imageURL;
NSImage *image;
NSString *link;
NSString *description;
}
-(void) fetch;
@property (strong, readwrite) NSString *title;
@property (strong, readwrite) NSString *network;
@property (strong, readwrite) NSString* imageURL;
@property (strong) NSImage *image;
@property (strong, readwrite) NSString *identification;
@property (strong, readwrite) NSString *link;
@property (strong, readwrite) NSString *description;
@end
米：
#import "PodcastShow.h"
@implementation PodcastShow
-(id) init
{
if (self)
{
NSLog(@"initilized");
}
return self;
}
-(void) fetch
{
[NSThread detachNewThreadSelector:@selector(getImageFromInternet) toTarget:self withObject:nil];
}
-(void) getImageFromInternet
{
self.image = [[NSImage alloc] initWithContentsOfURL:[NSURL URLWithString:self.imageURL]];
}
@end