Building libraries for iOS — Going native

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Building libraries for iOS Going native Alexander Dodatko 2014

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The standard library saves programmers from having to reinvent the wheel. Bjarne Stroustrup http://bit.ly/1iqZ3JO

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Code Reuse is Important

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March 2008

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http://engt.co/1pOLKH9

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The fastest code is the code that reaches the market first

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Nobody Cares

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August 2011

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pod install SomeAwesomeLibXYZ

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Except...

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Typical Workflow

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Our own Busyness Logic

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In-Place Editing

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Modular Architecture Benefits Code Reuse Test Coverage Easier to Apply Changes

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Going Native

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--no-integrate

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Not Just Library Target

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#import #import "AFHTTPRequestOperation.h" VS

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#import "AFHTTPRequestOperation.h" For Implementation Files

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#import For Public Headers

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Incapsulation

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#import #import

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Static Framework for iOS

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CFBundleDevelopmentRegion English CFBundleIdentifier org.ocmock CFBundleInfoDictionaryVersion 6.0 CFBundlePackageType FMWK CFBundleSignature ???? CFBundleVersion 2.2.3

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Drag & Drop

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Framework Search Path is updated by Xcode

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Frameworks Reduce Compilation Time

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CocoaPods Makes you Care about Versioning

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For Distribution For Development and Unit Testing

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For You For End Users

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Library Dependencies and Linker

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Never Link Libraries into Other Libraries

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Same Approach for Unit Tests

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All Testable Code Should be in libraries

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Use Precompiled Headers

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// Pure C headers go here #include #ifdef __cplusplus // Pure C++ headers go here #include #endif #ifdef __OBJC__ // Objective-C headers go here #import #ifdef __cplusplus #import "MyObjectiveCppClass.h" #endif #endif

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But I do not Need C++

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NSDictionary* errorMessages; NSLog( @"%@", errorMessages[ @( errorCode ) ] ); Print Message for Low Level Error

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std::map< NSInteger, NSString* > errorMessages; NSLog( @"%@", errorMessages[ errorCode ] ); C++ ===> No Boxing

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Scoped Guard

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void bad(const char* p) { FILE* fh = fopen(p,"r"); // acquire // use f if ( someCondition ) { // Oops! File handle leaks return; } fclose( fh ); // release }

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void good(const char* p) { FILE* fh = fopen(p,"r"); // acquire // the block to perform cleanup actions GuardCallbackBlock releaseBlock_ = ^void( void ) { fclose( fh ); }; // creating a guard ObjcScopedGuard guard( releaseBlock_ ); if ( someCondition ) { // Now the scoped guard will release the resource return; } }