Xcode 8,禁用类级别属性

Question

在Xcode 8中,Objective-C略有改变.现在有类级属性.例如,NSBundle的标头

@interface NSBundle : NSObject {
...

/* Methods for creating or retrieving bundle instances. */
#if FOUNDATION_SWIFT_SDK_EPOCH_AT_LEAST(8)
@property (class, readonly, strong) NSBundle *mainBundle;
#endif

+ (nullable instancetype)bundleWithPath:(NSString *)path;
- (nullable instancetype)initWithPath:(NSString *)path NS_DESIGNATED_INITIALIZER;

+ (nullable instancetype)bundleWithURL:(NSURL *)url NS_AVAILABLE(10_6, 4_0);
- (nullable instancetype)initWithURL:(NSURL *)url NS_AVAILABLE(10_6, 4_0);

+ (NSBundle *)bundleForClass:(Class)aClass;
+ (nullable NSBundle *)bundleWithIdentifier:(NSString *)identifier;

#if FOUNDATION_SWIFT_SDK_EPOCH_AT_LEAST(8)
@property (class, readonly, copy) NSArray<NSBundle *> *allBundles;
@property (class, readonly, copy) NSArray<NSBundle *> *allFrameworks;
#endif
...

看看,主要包.现在它被声明为property但是带有class关键字.我认为它代表着class level property.好.

向下滚动后,我找到了这些代码.

#define NSLocalizedString(key, comment) \
        [NSBundle.mainBundle localizedStringForKey:(key) value:@"" table:nil]
#define NSLocalizedStringFromTable(key, tbl, comment) \
        [NSBundle.mainBundle localizedStringForKey:(key) value:@"" table:(tbl)]

看看,如何mainBundle访问.但我使用JetBrains的AppCode,这个IDE将这样的结构视为无效代码.AND,[NSBundle mainBundle]变为无效,AS + (instancetype)mainBundle方法不存在.

我的问题是否 可以在不切换Xcode的情况下以某种方式切换到旧的ObjectiveC样式编码？

Answer 1

@property (class, readonly, strong) NSBundle *mainBundle;

这相当于此(有一些额外的元数据可以帮助静态分析器和Swift API生成):

+ (NSBundle *)mainBundle;

如果您的IDE /编译器随后未[NSBundle mainBundle]正确编译(或其中的等效编译器),那么您的IDE /编译器将被破坏.