基础标头而不是 Objective-C 类（NSObject 子类）的 cocoa 标头
在 xcode 4 中，当我尝试使用 Mac OS X 模板创建一个类（例如“ABClass”）时，创建文件时的最终结果是：
//header
#import <Foundation/Foundation.h>
@interface DBFTimer : NSObject {
@private
}
@end
另一个文件
//.m file
#import "DBFTimer.h"
@implementation DBFTimer
- (id)init
{
self = [super init];
if (self) {
// Initialization code here.
}
return self;
}
- (void)dealloc
{
[super dealloc];
}
@end
是一个错误吗？解决办法是什么？ （运行 Xcode 4 Build 4A304a）
编辑：好的，现在我明白为什么了，因为这是 NSObject 的子类，因此只需要基础标头。
in xcode 4, when i try to create a class, for example "ABClass" using a template for Mac OS X, the end result when the file created is:
//header
#import <Foundation/Foundation.h>
@interface DBFTimer : NSObject {
@private
}
@end
and the other file
//.m file
#import "DBFTimer.h"
@implementation DBFTimer
- (id)init
{
self = [super init];
if (self) {
// Initialization code here.
}
return self;
}
- (void)dealloc
{
[super dealloc];
}
@end
is this a bug? and what is the solution? (running Xcode 4 Build 4A304a)
EDIT: ok now i understand why, as this is an subclass of NSObject, thus the foundation header only is required.
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这是一个对 Cocoa 和 Cocoa Touch 都有效的类。我相信最新版本的 Xcode 会根据您指定的超类来决定是否导入 Cocoa/Cocoa.h 还是 Foundation/Foundation.h。如果您创建的类继承自
NSObject，则无需导入整个 Cocoa — 仅 Foundation 就足够了。That’s a valid class for both Cocoa and Cocoa Touch. I believe recent versions of Xcode decide whether to import Cocoa/Cocoa.h or Foundation/Foundation.h based on what you’ve specified as the superclass. If the class you’ve created inherits from
NSObject, there’s no need to import the whole of Cocoa — Foundation alone suffices.您发布的示例是一个完全有效的 Mac OS X Cocoa 类。 （即：该类没有任何与 iOS/Cocoa Touch 相关的内容。）
就您使用
The example you've posted is a perfectly valid Mac OS X Cocoa class. (i.e.: There's nothing about that class that's iOS/Cocoa Touch related.)
In terms of your comment about iOS using
<Foundation/Foundation.h>- this isn't the case - if you look inside<Cocoa/Cocoa.h>, you'll find that it actually includes the foundation header itself as well as other items such as CoreData, etc.