无法声明另一个窗口 [英] Can't declare another window

问题描述

我正在尝试在MyThing.m中声明另一个窗口

I'm trying to declare another window in MyThing.m

@property (nonatomic, strong) UIWindow *window;

但是出现此错误

在类扩展中非法声明属性 "MyThing"(属性必须为"readwrite"，而其主要 必须为只读")

Illegal redeclaration of property in class extension "MyThing" (attribute must be 'readwrite', while its primary must be 'readonly')

如果我将窗口重命名为其他名称，就可以了.这是为什么?窗口是否应在AppDelegate.h中声明一次?

If I rename window to something else, it is OK. Why is that? Is window meant to be declared once in the AppDelegate.h ?

推荐答案

我发现了问题，这与AppDelegate.h中声明的window属性无关.

I figure out the problem, it has nothing to do with the window property declared in AppDelegate.h

问题是MyThing符合UIApplicationDelegate，并且UIApplicationDelegate协议声明了一个属性

The problem is MyThing conforms to UIApplicationDelegate, and UIApplicationDelegate protocol declare a property

@property (nonatomic, retain) UIWindow *window NS_AVAILABLE_IOS(5_0);

所以我们必须做这两个

MyThing.h (就像AppDelegate.h一样)

MyThing.h (like AppDelegate.h does)

@interface MyThing : NSObject <UIApplicationDelegate>

@property (nonatomic, strong) UIWindow *window;

@end

OR

MyThing.m (合成协议中声明的window属性)

MyThing.m (synthesize the window property declared in protocol)

@implementation WYNAppDelegate

@synthesize window;

@end

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