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What is bundle ID?Bundle ID (Bundle Identifier) is a unique identifier for an iOS app and is the only correspondence between apps and Bundle IDs.Note: Once the app is created, the Bundle ID will not be modifiable, and if it has to

Extra-Long Caution entry list: Dznemptydataset (UI, empty table view graphic operator) Pdtsimplecalendar (ui,drop-in calendar component) Magicalrecord (Core data assistant that implements active recording mode) Chameleon (UI, color frame) Alamofire (Swift Network) Textfieldeffects (UI, text area for custom skins) Gpuimage (fast picture processing) Irate (get user reviews) Gamecentermanager (Quick Management Game Center) Pkrevealcontroller (UI, swipe sidebar menu)

What is the difference between Retain and Copy in IOS? iosretaincopy 1. Readability: readonly and readwrite@ Property (readwrite,...) valueType value;This attribute is the default attribute of the variable. If you (readwrite and readonly are not used, your variable is the re

throws an exception.This macro validates a parameter for an objective-c method. Simply provide the parameter as the condition argument. The macro evaluates the parameter and, if it is false, it logs a error message that includes the parameter and then raise s an exception.If you define a preprocessing macro, the Ns_block_assertions assertion is forbidden. All the breakpoint macros return void.Assertions

throws an exception.This macro validates a parameter for an objective-c method. Simply provide the parameter as the condition argument. The macro evaluates the parameter and, if it is false, it logs a error message that includes the parameter and then raise s an exception.If you define a preprocessing macro, the Ns_block_assertions assertion is forbidden. All the breakpoint macros return void.Assertions

1. Thread synchronization is multiple threads accessing the same resource at the same time, waiting for resource access to end, wasting time, inefficient, serial execution of tasksThread Async: Access resources while idle wait while accessing other resources, implement multithreading mechanism, execute task 1.2.3 mode in parallelUse GCD's primary queue. Use Nsoperationqueue to set the maximum number of threads (concurrency) to 1 1.1.1How

What is the difference between ASI and AFN?1. Performance (Focus)* ASI based on the underlying cfnetwork framework* AFN based on nsurlconnection* Operating performance: ASI > ASN2. Processing server data1> AFN: Automatic parsing based on data returned by the server* The server returns JSON data, automatically converted to nsdictionary or Nsarray* The server returns XML data and

First, create the PCH file. Click Command+n. such as OperationNaming conventions are generally: project name-prefixStep TwoOK, you have finished making the PCH file here. Then you can use it.PCH files generally write data that can be used globally.Like what:The width and color of the screen (no punctuation behind the macro)#define RGB (r,g,b,a) [Uicolor colorwithred: (r/255.0) Green: (g/255.0) Blue: (b/255.0) Alpha: (a)] #define SCREEN_W [ UIScreen mainscreen].bounds.size.width#define Screen_h