［已解决］swift代码出错：Cannot find protocol declaration for ‘NSObject’

代码：

@protocol GesturePasswordDelegate <NSObject>

– (void)forget;

– (void)change;

@end

出错：

GesturePasswordView.h:9:36: Cannot find protocol declaration for ‘NSObject’

如图：

Cannot find protocol declaration for ‘NSObject’

ios – cannot find protocol declaration for NSObject – Stack Overflow

objective c – "Cannot find interface declaration for NSObject"? – Stack Overflow

iphone – Cannot find protocol declaration NSObject – Stack Overflow

加上导入foundation：

#import <Foundation/Foundation.h>

@protocol GesturePasswordDelegate <NSObject>

– (void)forget;

– (void)change;

@end

即可。

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