如何在objectiveC中将非静态变量从接口移动到实现?

您不能在实现文件中定义实例变量。

一个可能的解决方案是有一个包含私有变量的私有结构,并有一个公开声明的私有变量指向这个私有结构:

@interface MyView {
   void *privateData;
}

实施文件:

typedef struct {
   NSTimer *myTimer;
}  PrivateData;


@implementation MyView()

@property (readonly) PrivateData *privateData;

@end


@implementation MyView

- (id) init {
   if (self = [super init]) {
       privateData = malloc(sizeof(PrivateData));

       self.privateData->myTimer = nil; // or something else
   } 

   return self;
}

-(PrivateData *) privateData {
    return (PrivateData *) self->privateData;
}

- (void) myMethod {
   NSTimer *timer = self.privateData->myTimer;
}

- (void) dealloc {
    // release stuff inside PrivateData
    free(privateData);
    [super dealloc];
}

@end

它不漂亮,但它有效。也许有更好的解决方案。

只是一张便条;为了安全而试图隐藏iVar是愚蠢的。不用麻烦了。

然而,有几个解决方案:

Foo.h:

@interface Foo:NSObject
@property(readwrite, copy) NSString *publiclyReadwriteNoiVar;
@property(readonly, copy) NSString *publiclyReadonlyPrivatelyReadwriteNoiVar;
@end

@interface Foo()
@property(readwrite, copy) NSString *privateProperty;
@end

@implementation Foo
@synthesize publiclyReadwriteNoiVar, publiclyReadonlyPrivatelyReadwriteNoiVar, privateProperty;
@end

Foo.h:

@interface Foo:NSObject
@end

@interface RealFoo:Foo
{
    .... ivars here ....
}
@end
@implementation RealFoo
@end

@implementation Foo
+ (Foo *) convenienceMethodThatCreatesFoo
{
   .... realFoo = [[RealFoo alloc] init]; ....
   return realFoo;
}
@end

根据封装的目标,还有@private指令:

Access Modifiers