zhangbingcox的专栏

dispatch_async(dispatch_get_global_queue(0, 0), ^{         NSLog(@"后台执行");     });          dispatch_async(dispatch_get_main_queue(), ^{         NSLog(@"主线程执行");     });          static disp

NSDictionary *infoDict = [[NSBundle mainBundle] infoDictionary];     NSString *currentVersion = [infoDict objectForKey:@"CFBundleVersion"];     double doubleCurrentVersion = [currentVersion doubl