#coretext

“Finding Emojis in String😀” using Swift

Hi Friends,

Emoji detection is very Important in Chat application.

After I done chat conversation screen and I saw a WhatsApp application and I find a Emoji dictation That will show little bit larger than text. So, I analyse how they are finding the emoji in string?.

Finally I found the solution for this.

Using CoreText Framework, UnicodeScalar in Foundation

import Foundation import…

Apple releases iOS 11.2.6, watchOS 4.2.3, and tvOS 11.2.6 with with Telugu text bug fixes

Apple has released iOS 11.2.6, watchOS 4.2.3, and tvOS 11.2.6 with fixes to CoreText wherein a Telugu character could crash text apps.

Apple addressed a memory corruption issue via improved input validation.

iOS 11.2.6, watchOS 4.2.3, and tvOS 11.2.6 are available via the OSes’ Software Update mechanisms.

SEE ALSO: Apple releases macOS 10.13.3 Supplemental Update with Telugu text bug fix

Un nuevo error de iOS ha surgido recientemente que permite a los usuarios de iPhone a iPhone de otra persona simplemente enviar un mensaje de texto. El mensaje de texto causa que el iPhone de la víctima se bloquee continuamente si el texto es recibido mientras está en modo de bloqueo de pantalla.

El fallo también provoca que el iPhone se reinicie sin previo aviso. El accidente parece ocurrir solamente si hay comunicación de iPhone a iPhone, según 9to5Mac.

Una cadena de caracteres árabes específicos utilizados en el mensaje de texto son la causa del accidente. Si usted ha recibido el mensaje de texto que causa el accidente, entonces ha sido blanco como parte de una broma. El fallo no sucede por accidente ya que la cadena de caracteres es un conjunto muy específico de caracteres Unicode.

Un error idéntico a este tema también plagado de iOS 6 y OS X 10.8 surgió en Agosto de 2013. El fallo fue debido al motor de renderizado de CoreText de Apple en iOS 6 y OS X 10.8 causando una aplicación que intenta representar una cadena de caracteres árabes y estrellarse. Los ingenieros de Apple terminaron remendando ese bicho Unicode a través de su iOS 7 y actualización de software para OS X 10.9.

Muchas de las víctimas del nuevo fallo Unicode fueron en Twitter para ventilar sobre el tema.

Given a large body of text, how do you parse it into pages that can fit onto a 1024x768 iPad screen?  Or even break it up into beautiful magazine-like columns?

At first, CoreText seemed like an intimidating framework given I was unfamiliar with its C syntax, so I tried the brute force way: iterate over each word until boundingRectWithSize said I couldn't fit any more words for my view's frame.  In a collectionView cell, the performance was horrible, as you could imagine, so scrolling was jittery.

Next was to try CoreText.  Initially, I followed the Core Text Programming Guide's Columnar Layout example, which uses CTFrameSetterRef to divide the pages.  The implementation suggests subclassing UIView and overriding drawRect.

The result was much better.  The parsing of the text happened instantaneously.  But when profiled for memory allocations via Instruments, the app showed it was holding onto 12 mb of memory for each rendered page.  Given an article could have a dozen pages rendered onto the scrollview, memory was quickly building up and soon enough, you'd experience an out-of-memory crash.  I had to research more about CoreGraphics performance.  

I came across a great article about Rendering Graphics in iOS (GPU vs. CPU), and an even greater follow-up by Apple's (former) UIKit developer, Andy Matuschak!  

The most important lesson for me was that drawing a view with the CPU-based framework, CoreGraphics, presents the tradeoff of gaining higher performance for increased memory usage.