iOS 小知识的集合

把NavigationBar设置成透明的

[self.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];  

 [self.navigationBar setShadowImage:[UIImage new]];

self.navigationController.navigationBar.translucent = YES;

NavigationBar设置颜色

[self.navigationController.navigationBar setBarTintColor:[UIColor whiteColor]];

[self.navigationController.navigationBar setTintColor:[UIColor whiteColor]];

 self.navigationController.navigationBar.translucent = YES;

对与一些带国际化的项目，需要在info.plist文件中添加Localization native development region  string   china

xib 拉进代码的NSLayoutConstraint属性需要 用.constant来赋值才有效果

AFNetworking 获取http状态码 需要用NSError 获取

        NSString* ErrorResponse = [[NSString alloc] initWithData:(NSData *)error.userInfo[AFNetworkingOperationFailingURLResponseDataErrorKey] encoding:NSUTF8StringEncoding];

        NSLog(@"%@",ErrorResponse);

        NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:[ErrorResponse dataUsingEncoding:NSUTF8StringEncoding] options:0 error:NULL];