LBSwiftWeiBo | 1、ViewModel是对model的封装,存储属性一般放在model,其他属性处理放在ViewModel里面 | Style Language library
kandi X-RAY | LBSwiftWeiBo Summary
kandi X-RAY | LBSwiftWeiBo Summary
1、ViewModel是对model的封装,存储属性一般放在model,其他属性处理放在ViewModel里面 2、if let {}、guard let else{}、?? ""的使用,这三种方法经常使用,熟悉使用场景. 1、添加访客视图 2、导航栏设置、titleView弹出框实现 3、pod 的使用:首先安装pod,在项目根目录中pod init初始化,在profile文件中添加我们需要的框架名称,pod install即可 4、Swift网络请求封装 5、成为微博开发者,根据微博url获取code,再根据code获取access_token,根据access_token等信息获取用户个人信息 6、对于获取到的用户信息进行归档、解档处理 7、单利、计算属性的使用,??、guard else{}的使用 8、欢迎页头像动画实现、欢迎页和主页之间切换. 1、初始化项目,项目基本设置 2、storyboard 搭建项目基本结构 Storyboard 创建项目结构快而且简单,这里涉及到storyboard reference 可以分离子storyboard,使项目结构清晰而且更加有利于操作 3、创建标签控制器 ① 添加子控制器初始化对象创建 ② 使用子控制器名称字符串创建,涉及到命名空间的概念(nameSpace) ③ 使用json文件创建(涉及到json文件里数据的获取) ④ 创建标签栏中间按钮的思路:空出中间item区域,使用UIButton添加即可 4、小知识点 ① convenience遍历构造函数使用 ② 类方法的创建 class func lbweibo -> String{} ③ 按钮方法的监听 btn.addTarget(self, action: #selector(LBTabBarController.composeBtnClick), for: .touchUpInside) ④ 处理系统方法异常. ⑤ guard else{}的使用,用好这个项目中就会少很多麻烦问题, as、as?、as!区分使用原理. ⑥ 对于可选类型我们一般不适用!来进行解包,但是有个例还是可以使用!进行解包的, 对于我们确定一定有值的情况下是可以使用的 ⑦ 方法的重载 方法名称相同,但是参数不同.
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Trending Discussions on Style Language
QUESTION
I'm trying to write a Haskell-style language parser in ANTLR4, but I'm having some issues with function application. It parses as right associative rather than left associative
...ANSWER
Answered 2021-Dec-09 at 13:59As @sepp2k pointed out, | expression expression
will correct your issue.
ANTLR defaults to left associativity., but you were overriding that with the (expression)+
in trying to gather all the expressions.
Of course, this will give you a parse tree of (expr (expr (expr f) (expr "a")) (expr "b"))
but this is probably more in keeping with a Haskell approach to function application than just a list of expressions.
BTW, precedence only comes into play when operators are involved. Having StringLiteral
before LSquareParen
his no effect on precedence since there's no ambiguity in determining the correct parse tree to derive. You may find that your OperatorApplicationExpresion
alternative gives "surprising" results as it will evaluate all operators left-to-right, so a + b * c
will be evaluated as "(a + b) * c" and this violates arithmetic norms (maybe it's what you want however).
QUESTION
I keep receiving an error/lint which reads Variable 'self.item' used before being initialized
. This message only appears when I seemingly add a @State
of type Date
(see commented line below).
Variable item
is a CoreData
value that I'm attempting to update through a form. All of the other required data types (int, string, data, etc.) all work as expected.
I'm fairly confident that this is an issue which stems from my lack of experience with Swift or declarative-style languages in general, but I'm also wary that it could be a compiler issue as I seem to run into a few of those as well.
...ANSWER
Answered 2021-Jul-30 at 14:13Just do the following:
QUESTION
I want to use language="sass"
in my Vue 2 CLI project's components, but it throws me and error when using SASS syntax:
ANSWER
Answered 2020-May-18 at 08:11If anyone is interested, I repeated the same steps in my vue utils file, and it solved the problem
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