一、Runtime
- What isa objc of a pointer to an object? what's the effect?
- How much memory space occupied by the object a NSObject?
- Talk about understanding class_rw_t of?
- Talk about understanding class_ro_t of?
- Talk about understanding isa pointer
- Runtime way to talk about caching? In the form of storage, data structures, and the search process?
- Use runtime Associate associated method object, you need to release in dealloc when the main subject of it?
- Data structure instance of an object?
- What is the method swizzling (commonly known as black magic)
- When will the reported abnormal unrecognized selector?
- How to add properties to Category? Associated objects are stored in what form?
- You can increase the instance variables to get the compiled class? Can you add an instance variable to the class created in runtime? why?
- Data structure class object?
- How to find the corresponding runtime IMP address selector?
- How runtime automatically set to nil weak variables? You SideTable know it?
- What objc in sending a message to a nil object is going to happen?
- objc when sending a message to an object, what happened?
- isKindOfClass and isMemberOfClass
- Category After compiling, what is the time to merge with the original class together?
- Category What are the uses?
- Category realization of the principle?
- _objc_msgForward function is doing what
- [self class] 与 [super class]
- Code a problem
- Code title two
Two, Runloop
- Why NSTimer sometimes so bad?
- AFNetworking how to use Runloop?
- autoreleasePool is released when?
- PerformSelector implementation principle?
- PerformSelector: afterDelay: whether this method works in the sub-thread? why? How to deal with it?
- RunLoop of Mode
- RunLoop implementation mechanism
- RunLoop and thread
- RunLoop data structure
- RunLoop concept
- RunLoop and NSTimer
- Talk about the Observer?
- Explain NSTimer
- Explain
事件响应the process? - Explain the process of gesture recognition?
- What is asynchronous rendering?
- Runloop explain the process of using the page rendering?
Three, Objective_C language features
- KVC(Key-value coding)
- KVO (Key-value observing)
- Classification, extension, agent (Delegate)
- Keyword property
- Notification (NSNotification)
Four, Animation
- Tell me about the understanding of the CALayer.
CALayerTheContentsfew under several key attributes:
Five, Block
Six, UI-related
Seven, multithreading
- Processes, Threads
- Multi-process, multi-threaded
- Task queue
- iOS multithreading
- GCD --- queue
- Deadlock
- GCD task execution order
- dispatch_barrier_async
- dispatch_group_async
- Dispatch Semaphore
- Delay function (dispatch_after)
- Implemented using a single embodiment dispatch_once
- NSOperationQueue advantage
- NSOperation and NSOperationQueue
- NSThread + runloop achieve permanent thread
- Spin and mutex lock
Eight, memory management
- In Obj-C, how to detect memory leaks? You know which way?
- How to override the property at MRC Setter and Getter_
- Circular references
- Word on what
悬垂指针? What is野指针? - Talk about understanding retain, copy, assign, weak, _Unsafe_Unretain keyword
- Whether or not understand the concept of deep copy and shallow copy, how deep copy collections
- Use automatic reference counting principles to be followed
- Can you briefly Dealloc implementation mechanism
- What memory region 5, respectively?
- What memory management default keyword is?
- Memory management scheme
- Memory layout
- Talk about
iOSunderstanding memory management - Talk about
@dynamickeywords? - A brief talk about
@autoreleasePooldata structures? - Access
__weakmodified variables, has already been registered in the@autoreleasePoolmiddle? why? retain,releaseImplementation mechanism?- The MRC (manual reference count) and ARC (automatic reference counting)
BAD_ACCESSUnder what happens?autoReleasePoolWhen was it released?- ARC principle of automatic memory management
ARCWhat had been done at runtime?ARCWhat had been done at compile timeARCOfretainCounthow the stored?__weakProperty modified variables, how strong references in the variables are not set to automaticnil?__weakAnd_Unsafe_Unretainthe difference?
Nine, design patterns
- How to design a statistical framework for long time?
- How to design a picture frame buffer?
- Six design principles of programming?
Ten, data security and encryption
Eleven, Data Structures and Algorithms
- iOS development data structure
- iOS algorithm interview questions (a)
- iOS algorithm interview questions (b)
Twelve, network-related
- HTTP protocol
- The HTTPS, symmetric encryption, asymmetric encryption
- Based on a simple chat Demo UDP's
- Characteristics of UDP, UDP packets and error detection structure
- TCP, three-way handshake, the fourth wave, code implementation
- Reliable data transfer, flow control (sliding window), congestion control
- DNS
- Cookie和Session
- IP protocol, IP datagram fragments, the IPv4 addressing, Network Address Translation (NAT)
- IPv6, the migration from IPv4 to IPv6
XIII, performance optimization
- Performance Optimization face questions iOS
- Rasterization
- How to check the daily memory leak?
- How to draw a rounded performance?
- How to improve
tableviewfluency? - How to optimize
APPpower? - How to effectively reduce the size of APP package?
- What is off-screen rendering? Under what circumstances would trigger? How to deal with?
- How to detect off-screen rendering?
- How to detect the layer blending?
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