loganblevins

extension Double {
    func safeInt() -> Int? {
        guard isFinite else { return nil }
        if self >= Double(Int.min) && self < Double(Int.max) {
            return Int(self)
        } else {
            return nil
        }
    }
}

loganblevins

extension XCTestCase {
    func trackForMemoryLeaks(_ instance: AnyObject, file: StaticString = #filePath, line: UInt = #line) {
        addTeardownBlock { [weak instance] in
            XCTAssertNil(instance, "Instance should have been deallocated. Potential memory leak.", file: file, line: line)
        }
    }
}

loganblevins

import Foundation
import Combine
import XCTest

@testable import Stock

extension XCTestCase {
    func awaitPublisher<T: Publisher>(
        _ publisher: T,

loganblevins

iOS-PairProgramming

Review the REST API playground to review JSON structure: https://swapi.dev

1. Create new iOS or tvOS project
2. Create app that fetches data from the following REST API: https://swapi.dev/api/people/1
3. Display name and height of person ID 1 fetched using above endpoint
4. Consider architecture, testability, error handling, and empty/placeholder state

loganblevins

// https://stackoverflow.com/a/57315975
// https://forums.developer.apple.com/thread/105088#357415

func memoryFootprint() -> mach_vm_size_t? {
    // The `TASK_VM_INFO_COUNT` and `TASK_VM_INFO_REV1_COUNT` macros are too
    // complex for the Swift C importer, so we have to define them ourselves.
    let TASK_VM_INFO_COUNT = mach_msg_type_number_t(MemoryLayout<task_vm_info_data_t>.size / MemoryLayout<integer_t>.size)
    let TASK_VM_INFO_REV1_COUNT = mach_msg_type_number_t(MemoryLayout.offset(of: \task_vm_info_data_t.min_address)! / MemoryLayout<integer_t>.size)
    var info = task_vm_info_data_t()
    var count = TASK_VM_INFO_COUNT

loganblevins

i386 : iPhone Simulator
x86_64 : iPhone Simulator
iPhone1,1 : iPhone
iPhone1,2 : iPhone 3G
iPhone2,1 : iPhone 3GS
iPhone3,1 : iPhone 4
iPhone3,2 : iPhone 4 GSM Rev A
iPhone3,3 : iPhone 4 CDMA
iPhone4,1 : iPhone 4S
iPhone5,1 : iPhone 5 (GSM)

loganblevins

CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
CVPixelBufferLockBaseAddress(imageBuffer,0);

size_t height = CVPixelBufferGetHeight(imageBuffer);
size_t width = CVPixelBufferGetWidth(imageBuffer);
size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer);

void *sourceData = CVPixelBufferGetBaseAddress(imageBuffer);

// Set a bunch of variables we need. The "radius" for the blur kernel needs to be positive and odd. The permute map maps the BGRA channels of the buffer to the ARGB that vImage needs.

loganblevins

import UIKit
import ImageIO
import MobileCoreServices
import PlaygroundSupport

PlaygroundPage.current.needsIndefiniteExecution = true

func report_memory() -> UInt64 {
    var taskInfo = mach_task_basic_info()
    var count = mach_msg_type_number_t(MemoryLayout<mach_task_basic_info>.size)/4

loganblevins

Google Protobuf 3.6.1 - Mac OS X and iOS Support

The script in this gist will help you buid the Google Protobuf library for use with Mac OS X and iOS. Other methods (such as homebrew or direct compilation) have issues that prevent their use. The libraries built by this script are universal and support all iOS device architectures including the simulator.

This gist was adapted from the original at https://gist.github.com/BennettSmith/7150245, further adapted from https://gist.github.com/petewarden/c8d172709018780eb069 and updated to deal with iPhone Simulator - i386 issues when building on >=Sierra, and download protobuf version 3.6.1.