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Why do UI elements only work on the main thread?

I am trying modeling run loop in a simple project. Could you post the source code of RunLoop?

• UIKit

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How does V/HStack update on Avatar Picker App on macOS?

Hello. How does V/HStack update on Avatar Picker App (The Contacts App) on macOS so smoothly? Can you share some source code, please?

• Swift
• SwiftUI
• UI Frameworks
• wwdc21-10018

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Is it legal to use 2d array in shaders?

Hello, I'm going to use C's 2d array in my shaders. The reason is to use 2d index in buffer, instead using textures. Someone from the developers can dissuade me from doing this? #include <metal_stdlib> using namespace metal; struct DebugCell {     float4 info; }; struct DebugBuffer {     DebugCell cells[5][3]; // Column number(x), Row number(y). (x, y)  }; kernel void debugCells(device DebugBuffer *current [[buffer(0)]], uint2 id [[thread_position_in_grid]]) {     current[0].cells[id.x][id.y].info.xy = float2(id); } /*  after reshape for printing on CPU it prints  [[0.0,0.0], [1.0,0.0], [2.0,0.0], [3.0,0.0], [4.0,0.0], [5.0,0.0], [6.0,0.0], [7.0,0.0]]  [[0.0,1.0], [1.0,1.0], [2.0,1.0], [3.0,1.0], [4.0,1.0], [5.0,1.0], [6.0,1.0], [7.0,1.0]]  [[0.0,2.0], [1.0,2.0], [2.0,2.0], [3.0,2.0], [4.0,2.0], [5.0,2.0], [6.0,2.0], [7.0,2.0]]  */

• Metal

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teamPlayerID bug

Hello. I found that the property teamPlayerID in GKLocalPlayer.local does not match with property of instance match(GKMatch).players[0] on other device example: 1st device me: T:e96ffe8e2c2113a1081345d8175dd34a, enemy: 159791492614296288 2nd device me: T:5445ac43188d54e227751262416576f2 enemy: 159791492784529792 While if I use the deprecated property playerID, it works perfect 1st device me: G:1459229978 enemy: U:b128518d718a7a11e43d83f33a7e43cb 2nd device: me: U:b128518d718a7a11e43d83f33a7e43cb enemy: G:1459229978

• Graphics and Games

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one object in 1k vertices is displayed well, while 100 objects with 10 vertices are frezzing

Why is one object with 100 thousand vertices in the scene displayed very vigorously, while 100 objects with 1 thousand vertices makes a heavy load on the processor ?

• Metal

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Why are my triangles transparent?

Hello. How to make triangels not transpirient? Can you post link to any tutorial about it?https://vimeo.com/387975739

• Metal

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GKGameSession was deprecated. Why?

In 2016 on WWDC was presented the GKGameSession. And I thinked it was very intresing API.But when now I returned to the Game Develop I discovered GKGameSession was depricated?100 players was too much for Game Centers live servers? What is the reason of these step?

• GameKit

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