Some advantages of using ios Swift are as follows:

• It is very fast in terms of execution and both type-safe and memory-safe: Swift is an extremely fast language as far as execution speed is concerned. Also, it is very easy to learn and code in Swift is easy. Type safety refers to the language's ability to prevent type mistakes. Memory safety refers to the absence of FLAWS caused by uninitialized pointers, which could cause a program to crash. Developers can discover any code flaws with a shorter feedback loop (where outputs are sent back as inputs, which determines the cause and effect of that loop), which reduces debugging time and eliminates the danger of low-quality code.
• Swift is interoperable with Objective C: In Swift, Projects can be WRITTEN in either Objective C or C++ because they are interoperable. This is particularly beneficial for large projects that are being upgraded when new Swift features are added and subsequently incorporated into the Objective C core.
• Applications made using ios Swift are easy to maintain: Swift makes it simple to maintain an application once it has been built. Swift merges the Objective C header (.m) and implementation files (.h) into a single programme (.swift) file, as opposed to Objective C, which is managed in two separate files. It is worth noting that Swift has dependencies. On macOS, Swift is ALREADY installed and ready to use; however, on Linux, you must first install essential dependencies, such as Python and then use it.
• Applications developed using Swift provide a better experience to its users: Swift developed applications take less time to install and consume less on device memory, giving users a better application experience.
• Swift has efficient memory management: Swift expands on its ObjectiveC predecessor with a mechanism called Automatic Reference Counting (ARC). The ARC identifies which class instances aren't in use and removes them from developers' workspaces. This frees up time for developers to focus on the application's performance rather than lowering CPU or memory usage.
  Swift provides Application Binary Interface (ABI) stability: Swift's Application Binary Interface (ABI) is the binary version of the Swift Application Programming Interface (API). While ABI stability is an important accomplishment for any programming language, "the ultimate advantage to the Swift ecosystem was to enable binary compatibility for applications and libraries," according to Swift. In practice, the ABI enables code compiled with multiple versions of Swift, as well as Objective-C, to communicate with one another.
• The usage of optionals in Swift: Optionals are a programming technique that allows developers to avoid application crashes because of Null Pointers while maintaining clean code across the application. Consider it a wrapper type that protects the VALUE inside. An optional might be filled with data or left blank. Optionals must be unwrapped to be sure, and if done correctly, will not cause crashes.

Some disadvantages of using ios Swift are as follows:

• Swift is a new language: Swift is a newcomer compared to Objective C, which has been around since the 1980s. Swift came into being in 2014. It MAY experience growth pains as a result of this. Swift has a restricted set of tools and libraries, despite recent improvements with ABI Stability and backward compatibility. Also, there is not a very big community of ios Swift developers to help the budding ios Swift developers with their problems.
• Binary compatibility does not work every time: Despite the fact that Swift 5.1 has ABI Stability, code generated using multiple versions of Swift can cause issues. Code might have been built as a static library and put into a project as a dependency when developers mostly used Objective C. It was impossible to develop static libraries in Swift prior to the release of Swift's ABI. While this is now possible, including those dependencies in a project poses challenges.
• It is not a Reflective Language: Reflection is a technique that can be used to watch and change the execution of a program while it is running. A reflection oriented software component can track the execution of a code enclosure and adjust its behaviour to meet the enclosure's goals. This is usually performed by assigning programme code dynamically at runtime. Swift is not a reflective programming language in the same way that Java or Kotlin are. Instead, it provides an alternative: the Mirror feature. Swift can "self describe" an object with this, but it can't alter it from within. If Swift had a reflection, it would automatically inject dependencies, however, this is thought to be impossible to achieve.