retro arc

1. Block declarations and thread safetyThe declaration of the block attribute first needs to use the copy modifier, because only copy after the block will be in the heap, the life cycle of the block in the stack is bound to the stack, you can refer to the previous article (IOS: Non-arc back block).Another issue to be aware of is thread safety, which needs to be confirmed when declaring the Block property "is it possible for another thread to modify bl

The problem is a bit strange. Let me describe it in detail. I created a c header file FALog. hL as my log tool class (non-arc) instead of NSLog. This c file contains part of the objc code. My entire project is non-arc and only two files A and B are arc. In build parses, I set compile flags of A and B to-fobjc-arc, befo

IOS in ARC environment Dealloc use, understanding misunderstandingThe beautiful Life of the Sun Vulcan (http://blog.csdn.net/opengl_es)This article follows "Attribution-non-commercial use-consistent" authoring public agreementReprint Please keep this sentence: Sun Vulcan's Beautiful Life-this blog focuses on Agile development and mobile and IoT device research: IOS, Android, HTML5, Arduino, Pcduino , Otherwise, the article from this blog refused to

1. PrefaceNext: ios-How to convert a non-ARC project into an arc project (actual combat)2. Memory-management-related configurationWhen we manage the non-arc memory management, we find that when doing some operations memory is still slowly increased such as the simplest random number uitableview display and sliding, memory management, should not appear memory incr

iOS5.0 can start with arc (Automatic Reference counting: Auto reference count) instead of the previous MRC (Manual Reference Counting: Manual reference count). Using arc will reduce the amount of code and the frustration of forgetting to release objects. But there are two sides to everything. After using arc, if you want to reuse a previously written use of the M

Xcode5之后创建项目，默认会自动开启ARC自动引用计数机制，但我们在实际应用开发中考虑到种种原因，有时候不得不关闭（开启）整个应用或部分类的ARC。The steps are:Apple LLVM 6.0-language-objective C, objective-c Automatic Reference counting set N, Project-Build settings O To turn off the entire arc, set Yes to on.Sometimes when we introduce a third-party class library, because the third-party class library does not support

Brother B, neither now strong brother to Hello. So now this weak d Big Brother pointed to the object is a fart, both nil.the difference between strong and weakstrong indicates that the memory area on the heap it points to is no longer pointing to this area. That is to say, I have a strong point to a region, we no longer point to its condition only we point to nil or I am not in memory, no one strong point to me, weak said if no one points to it, it will be cleared memory, and is pointed to nil,

1. Block declarations and thread safetyThe declaration of the block attribute first needs to use the copy modifier, because only the copy block will be in the heap, the life cycle of the block in the stack is bound to the stack, you can refer to the previous article (IOS: Non-arc back block).Another issue to be aware of is thread safety, which needs to be confirmed when declaring the Block property "is it possible for another thread to modify block wh

IOS development Advanced Interview Questions-Role of dealloc under ARC,-arcdealloc In the MRC era, we need to do a lot in dealloc, such as releasing objects; Now we have entered the ARC era. The system has helped us with the release of common objects; Can I rest assured? What should we do under ARC? Opinion: Under ARC

The ARC scale selector implemented by custom view is implemented during Android development with the following effect.Demo effectOne, measurement:First, in the Onmeasure method, the width, center, and radius of the current view are obtained by measuring theMwidth = Getmeasuredwidth (); mheight = Getmeasuredheight (); Mcenterx = Mwidth/2;mcentery = 0;radius = Math.min (mwidth/2 -Padding, mheight/2-padding);Two, draw the arc:Arcs can be drawn by canvas.

iOS app development: What is ARC?Blog Category: Phone/ios/objective-c/Swift What is arc?ARC is a new feature of iOS 5, called arc (Automatic Reference counting). Simply put, it is the code that automatically joins the Retain/release, and the code that originally needed to manually add a reference count to

IOS Arc Memory Auto-management mechanism, at present, almost a lot of projects will go with ARC, because it frees the memory of this physical work to dry, but, although ARC is very good, we still can not completely put memory management this thing behind the head.How ARC works:ARC is a pre-compilation step that automat

Before sending an article about picture loading optimization, or caused a lot of attention, but there are a lot of people do not understand the feedback, this talk about the iOS in some of the use of Arc notes, I believe that the development of iOS will not be unfamiliar to arc.This is not about the use of Arc, just to introduce the next arc can still occur under

The drawing curve has the following four methods: Arc (), Artto (), Beziercurveto (), and Quadraticcurveto ().The first is relatively simple, is to draw a circular arc. The next three methods are a bit more complex, and you need to define control points. 1,arc () Draw an arc An a