I want to use a GeometryReader{} to contain a view, so I can decide the position of the view base on the parent container property such as size, coordinates space, ect... So, I have some like this: code {
                    geometry .badgeSymbols
                        .scaleEffect( / , anchor: .top)
                        .position(x: geometry.size.width / ,
                                  y: ( / ) * geometry.size.height)
                } GeometryReader in self 1.0 4.0 2.0 3.0 4.0 {
                    geometry width = geometry.size.width ; height = geometry.size.height; .badgeSymbols
                        .scaleEffect( / , anchor: .top)
                        .position(x: width / ,
                                  y: ( / ) * height)
                } GeometryReader in var var self 1.0 4.0 2.0 3.0 4.0 It should work just fine according to my . knowledge How ever I get an error like this: Encounter a strange error, I went to the answer. google And following is my found: 1. Curly braces`{ ...body...}` after the GeometryReader  is a syntax called closure. In this case, we call GeometryReader to initialize a GeometryReader instance. According to the Documentation of GeometryReader by Apple. When we instantiate a type, and there is only one parameter, this parameter happens to be a function.Type, we can GeometryReader followed by {}function (Closure function). 2. Why I can not write variable inside a closure?  Soon I realised I asked the wrong question. Yes, I can write variable inside a closure. I was writing a variable inside a return sentence. When there is no return keyword in the statements section, the whole section will be treated as a return statement. I can not write new variable inside the return statement. So, I added a return keyword to teturn my view. {
                    geometry width = geometry.size.width ; height = geometry.size.height; .badgeSymbols
                        .scaleEffect( / , anchor: .top)
                        .position(x: geometry.size.width / , y: ( / ) * geometry.size.height) ( )
                } GeometryReader in var var self 1.0 4.0 2.0 3.0 4.0 return Text "Position:x: \(geometry.size.width / 2.0) y: \((3.0 / 4.0) * geometry.size.height))" Now I encountered another issue, Generic parameter`Content`could not be infered. So, I explicitly specify the arguments to fix this issue. It goes like this: < > {
                    geometry width = geometry.size.width ; height = geometry.size.height; .badgeSymbols
                        .scaleEffect( / , anchor: .top)
                        .position(x: geometry.size.width / , y: ( / ) * geometry.size.height) ( )
                } GeometryReader Text in var var self 1.0 4.0 2.0 3.0 4.0 return Text "Position:x: \(geometry.size.width / 2.0) y: \((3.0 / 4.0) * geometry.size.height))" The reason being that, GeometryReader.Type has a generic parameter defined by Apple developer... It is stated like this: @frozen < > : struct GeometryReader Content where Content View Simple Explanation: I provide a type that conforms the View Protocol, the compilation will pass.

Apple

Google

Read My Stories

Too Long; Didn't Read

In your car, at home, or at work — Bosch technology shapes many areas of life.

Why I Cannot Add Variable to GeometryReader{} Closure Argument

Too Long; Didn't Read

Companies Mentioned

[email protected]

About Author

TOPICS

THIS ARTICLE WAS FEATURED IN...

Why I Cannot Add Variable to GeometryReader{} Closure Argument

Too Long; Didn't Read

Companies Mentioned

[email protected]

About Author

TOPICS

THIS ARTICLE WAS FEATURED IN...

RELATED STORIES