Author Archives: admin

Your app using node-cron could be on a delayed fuse

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Node cron (npm i node-cron)is an excellent library and it serves it purpose quite well unless you decide to use Time Zone dependent cron, then this library might expose you to a delayed bug as the code will work right 6 months a year. The CODE If you want to… Read more »

Certificate is not trusted mac keychain

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Summary: Delete and reinstall WWDR and recreate certificate. I came across a weird issue while making enterprise certificate from apple developer. I followed all the steps required to make a certificate. The steps whereas follows Create a CSR file Create a certificate on the developer centre Upload CSR file Generate… Read more »

The application bundle does not contain a valid identifier

On rare occasions Xcode will refuse to run your app on a device and you will come across this error The application bundle does not contain a valid identifier. Domain: com.apple.dt.MobileDeviceErrorDomain Code: -402653108 Xcode One of these three steps given below will resolve the issue for you Clear Derived Data… Read more »

Shuffle an array in Swift

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Swift now comes with built in shuffle functionality. Swift provides two methods shuffle() shuffled() shuffle() Shuffle reorders a collection in place. After calling shuffle on the collection the original collection is changed/reordered Since shuffle() is mutating in nature you cannot use it with constant declared using let keyword. It has… Read more »

Your application has presented a UIAlertController of style UIAlertControllerStyleActionSheet

This happens when you try to present a action sheet in iPad. Luckily you can make your action sheet work across iPhone and iPad without writing different code for specific platform.Using popoverPresentationController?.sourceView an example code is given below This will remove the crash and you will achieve desired behaviour in… Read more »

Convert Swift Collection to String

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It might happen that you need to convert a swift Set,Array,Dictionary to string. It might be because you want to log or might just want plain string. It is very easy to Convert Swift Collections to String by using description. Try the above code in the playground. No mapping and… Read more »

URLSession and Synchronous HTTP request

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It might sound stupid(and most of the time it is) but there are situations when you want to make a synchronous request using URLSession. I faced the situation when I had to log both request and response together. Semaphores and Synchronous HTTP request A asynchronous request looks something like this… Read more »

Ludo with Flutter for iOS and Android

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I have created a basic Ludo game with flutter which runs on both iOS and Android without any UI glitches. The base is free to use and is released under MIT license. Source code is here but read along to understand what it does. Capabilities and Limitations Tokens can come… Read more »

Fatal error: Unexpectedly found nil while unwrapping an Optional value

So your code is crashing with EXC_BAD_INSTRUCTION and you are getting a error like Fatal error: Unexpectedly found nil while unwrapping an Optional value or Fatal error: Unexpectedly found nil while implicitly unwrapping an Optional value This crash arises when we attempt to forcefully or Implicitly unwrap an optional and… Read more »