A-Hing
8/21/2019 - 9:27 AM

创建一个临时变量 关联属性

propery
content_copyfile_download
    if ([objc_getAssociatedObject(self, "20190123_joinChannel") isEqualToString:@"alreadyRequest"]) {
        return;
    }
    objc_setAssociatedObject(self, "20190123_joinChannel", @"alreadyRequest", OBJC_ASSOCIATION_RETAIN);