undeclared selector warning 警告处理

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场景：使用自定义的SDWebImage缓存处理，需要调用一个SDWebImage中的一个私有方法sd_setImage:imageData:basedOnClassOrViaCustomSetImageBlock:

{    // 使用默认的图片    SEL sel = @selector(sd_setImage:imageData:basedOnClassOrViaCustomSetImageBlock:);    dispatch_main_async_safe(^{        if ([self respondsToSelector:sel]) {            UIImage* image = [UIImage imageNamed:@"image"];            NSData* data = UIImagePNGRepresentation(image);            ((void (*)(id, SEL, UIImage*, NSData*, id))(void *) objc_msgSend)((id)self, sel, image, data, nil);        }    });}

编译遇到一个警告

warning: undeclared selector 'sd_setImage:imageData:basedOnClassOrViaCustomSetImageBlock:' [-Wundeclared-selector]            SEL sel = @selector(sd_setImage:imageData:basedOnClassOrViaCustomSetImageBlock:);                       ^1 warning generated.

解决方案1

{    // 使用默认的图片#pragma clang diagnostic push#pragma clang diagnostic ignored "-Wundeclared-selector"    SEL sel = @selector(sd_setImage:imageData:basedOnClassOrViaCustomSetImageBlock:);#pragma clang diagnostic pop    dispatch_main_async_safe(^{        if ([self respondsToSelector:sel]) {            UIImage* image = [UIImage imageNamed:@"image"];            NSData* data = UIImagePNGRepresentation(image);            ((void (*)(id, SEL, UIImage*, NSData*, id))(void *) objc_msgSend)((id)self, sel, image, data, nil);        }    });}

解决方案2

{    // 使用默认的图片    // 这种方式也是可以的     // SEL sel = NSSelectorFromString(@"sd_setImage:imageData:basedOnClassOrViaCustomSetImageBlock:");    SEL sel = sel_registerName("sd_setImage:imageData:basedOnClassOrViaCustomSetImageBlock:");    dispatch_main_async_safe(^{        if ([self respondsToSelector:sel]) {            UIImage* image = [UIImage imageNamed:@"image"];            NSData* data = UIImagePNGRepresentation(image);            ((void (*)(id, SEL, UIImage*, NSData*, id))(void *) objc_msgSend)((id)self, sel, image, data, nil);        }    });}

引用
How to get rid of the 'undeclared selector' warning

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