Data perisistence in iOS
- 1. Data Persistence in iOS Michał Tuszyński iOS/Android developer at appvetica @srgtuszy srgtuszy.github.com
- 2. Roadmap
- 5. Roadmap 1. NSUserDefaults 2. NSCache 3. NSCoding protocol
- 6. Roadmap 1. NSUserDefaults 2. NSCache 3. NSCoding protocol 4. CoreData
- 7. Roadmap 1. NSUserDefaults 2. NSCache 3. NSCoding protocol 4. CoreData 5. iCloud
- 9. What are NSUserDefaults? Key-value local storage, capable of storing both objects and primitive data types
- 10. What should not be stored in NSUserDefaults?
- 11. What should not be stored in NSUserDefaults? 1. Sensitive data
- 12. What should not be stored in NSUserDefaults? 1. Sensitive data 2. Heavy objects
- 13. What should not be stored in NSUserDefaults? 1. Sensitive data 2. Heavy objects 3. Big amounts of data
- 14. Demo
- 15. What if I need a mechanism to cache big amount of objects?
- 16. What if I need a mechanism to cache big amount of objects? ...use NSCache!
- 17. Why NSCache?
- 18. Why NSCache? Similar api to NSMutableDictionary class
- 19. Why NSCache? Similar api to NSMutableDictionary class - (void)setObject:(id)obj forKey:(id)key; - (void)removeObjectForKey:(id)key;
- 20. Why NSCache? Why not just use NSMutableDictionary then?
- 21. Why NSCache? Why not just use NSMutableDictionary then?
- 22. Why NSCache? Why not just use NSMutableDictionary then? - NSCache takes care of memory management
- 23. Why NSCache? Why not just use NSMutableDictionary then? - NSCache takes care of memory management - (void)setObject:(id)obj forKey:(id)key cost:(NSUInteger)num; - (void)setTotalCostLimit:(NSUInteger)lim;
- 24. Why NSCache? Why not just use NSMutableDictionary then? - NSCache takes care of memory management - (void)setObject:(id)obj forKey:(id)key cost:(NSUInteger)num; - (void)setTotalCostLimit:(NSUInteger)lim; - Will let you know when it disposes data (NSCacheDelegate)
- 25. Why NSCache? Why not just use NSMutableDictionary then? - NSCache takes care of memory management - (void)setObject:(id)obj forKey:(id)key cost:(NSUInteger)num; - (void)setTotalCostLimit:(NSUInteger)lim; - Will let you know when it disposes data (NSCacheDelegate) - (void)cache:(NSCache *)cache willEvictObject:(id)obj
- 26. Demo
- 27. How to store custom objects?
- 28. How to store custom objects? Using archives!
- 30. What are archives? Archives provide a means to convert objects and values into architecture-independent stream of bytes
- 31. What are archives? Archives provide a means to convert objects and values into architecture-independent stream of bytes Apple documentation
- 33. Archives
- 34. Archives
- 37. Archives Keyed archives Sequential archives
- 38. What is the difference?
- 39. What is the difference?
- 40. What is the difference? Sequential archives
- 41. What is the difference? Sequential archives -Encoded from root object through all interrelated objects
- 42. What is the difference? Sequential archives -Encoded from root object through all interrelated objects -Must be decoded in the same order it was encoded
- 43. What is the difference? Sequential archives Keyed archives -Encoded from root object through all interrelated objects -Must be decoded in the same order it was encoded
- 44. What is the difference? Sequential archives Keyed archives -Encoded from root object -Each object is assigned a key through all interrelated objects -Must be decoded in the same order it was encoded
- 45. What is the difference? Sequential archives Keyed archives -Encoded from root object -Each object is assigned a key through all interrelated objects -Must be decoded in the same order it was encoded NSArchiver
- 46. What is the difference? Sequential archives Keyed archives -Encoded from root object -Each object is assigned a key through all interrelated objects -Must be decoded in the same order it was encoded NSArchiver NSKeyedArchiver
- 47. How to create an archive out of a custom object?
- 48. How to create an archive out of a custom object? 1.Implement NSCoding protocol inside the object
- 49. How to create an archive out of a custom object? 1.Implement NSCoding protocol inside the object - (id)initWithCoder:(NSCoder *)decoder; - (void)encodeWithCoder:(NSCoder *)encoder;
- 50. How to create an archive out of a custom object? 1.Implement NSCoding protocol inside the object - (id)initWithCoder:(NSCoder *)decoder; - (void)encodeWithCoder:(NSCoder *)encoder; 2. Use one of the NSCoder subclasses to get your archive
- 51. Demo
- 53. Core Data
- 54. CoreData is an efficient framework to manage your object persistence
- 55. CoreData is an efficient framework to manage your object persistence Main features:
- 56. CoreData is an efficient framework to manage your object persistence Main features: -Change tracking and undo support
- 57. CoreData is an efficient framework to manage your object persistence Main features: -Change tracking and undo support -Relationship between entities maintenance
- 58. CoreData is an efficient framework to manage your object persistence Main features: -Change tracking and undo support -Relationship between entities maintenance -Automatic validation of property values
- 59. CoreData is an efficient framework to manage your object persistence Main features: -Change tracking and undo support -Relationship between entities maintenance -Automatic validation of property values -Low memory overhead (Faulting)
- 60. What Core Data is not?
- 61. What Core Data is not? -It is not a relational database
- 62. What Core Data is not? -It is not a relational database -It’s not a silver bullet for your code
- 63. How does it work?
- 64. How does it work? Storage
- 65. How does it work? Storage
- 66. How does it work? Storage NSPersistentStoreCoordinator
- 67. How does it work? Storage The bridge between the storage NSPersistentStoreCoordinator and the application
- 68. How does it work? Storage The bridge between the storage NSPersistentStoreCoordinator and the application
- 69. How does it work? Storage NSManagedObjectModel The bridge between the storage NSPersistentStoreCoordinator and the application
- 70. How does it work? Storage NSManagedObjectModel A collection of data models which are used in the application The bridge between the storage NSPersistentStoreCoordinator and the application
- 71. How does it work? Storage NSManagedObjectModel A collection of data models which are used in the application The bridge between the storage NSPersistentStoreCoordinator and the application
- 72. How does it work? Storage NSManagedObjectModel A collection of data models which are used in the application The bridge between the storage NSPersistentStoreCoordinator and the application NSManagedObjectContext
- 73. How does it work? Storage NSManagedObjectModel A collection of data models which are used in the application The bridge between the storage NSPersistentStoreCoordinator and the application Scratchpad which communicates with NSManagedObjectContext NSPersistentStoreCoordinator to save changes
- 77. NSManagedObjectModel Entity Relationship
- 78. NSManagedObject
- 79. NSManagedObject - Generic class that implements all basic behavior required by CoreData model object
- 80. NSManagedObject - Generic class that implements all basic behavior required by CoreData model object - It’s not possible to use regular NSObjects with Core Data
- 81. NSManagedObject - Generic class that implements all basic behavior required by CoreData model object - It’s not possible to use regular NSObjects with Core Data Can be created using following ways:
- 82. NSManagedObject - Generic class that implements all basic behavior required by CoreData model object - It’s not possible to use regular NSObjects with Core Data Can be created using following ways: 1. Designated initializer
- 83. NSManagedObject - Generic class that implements all basic behavior required by CoreData model object - It’s not possible to use regular NSObjects with Core Data Can be created using following ways: 1. Designated initializer - (id)initWithEntity:(NSEntityDescription *)entity insertIntoManagedObjectContext: (NSManagedObjectContext *)context
- 84. NSManagedObject - Generic class that implements all basic behavior required by CoreData model object - It’s not possible to use regular NSObjects with Core Data Can be created using following ways: 1. Designated initializer - (id)initWithEntity:(NSEntityDescription *)entity insertIntoManagedObjectContext: (NSManagedObjectContext *)context 2. Static method of NSEntityDescription class
- 85. NSManagedObject - Generic class that implements all basic behavior required by CoreData model object - It’s not possible to use regular NSObjects with Core Data Can be created using following ways: 1. Designated initializer - (id)initWithEntity:(NSEntityDescription *)entity insertIntoManagedObjectContext: (NSManagedObjectContext *)context 2. Static method of NSEntityDescription class + (id)insertNewObjectForEntityForName:(NSString *)entityName inManagedObjectContext: (NSManagedObjectContext *)context
- 86. Create NSManagedObjects to represent your data model NSManagedObject NSManagedObject NSManagedObject
- 87. NSManagedObjects are held in NSManagedObjectContext’s cache NSManagedObject NSManagedObject NSManagedObject
- 88. NSManagedObjects are held in NSManagedObjectContext’s cache NSManagedObject NSManagedObject NSManagedObject
- 89. NSManagedObjects are held in NSManagedObjectContext’s cache NSManagedObject NSManagedObject NSManagedObjectContext NSManagedObject
- 90. NSManagedObjects are held in NSManagedObjectContext’s cache NSManagedObject NSManagedObject NSManagedObjectContext NSManagedObject
- 91. NSManagedObjects are held in NSManagedObjectContext’s cache NSManagedObject NSManagedObject NSManagedObjectContext NSManagedObject Save
- 92. Demo
- 94. iCloud
- 95. Why should you use iCloud APIs?
- 96. Why should you use iCloud APIs? 1. There’s no need to configure and maintain servers
- 97. Why should you use iCloud APIs? 1. There’s no need to configure and maintain servers 2. Syncs across all devices without your effort
- 98. Why should you use iCloud APIs? 1. There’s no need to configure and maintain servers 2. Syncs across all devices without your effort 3. Autosaving and conflict resolving
- 99. Why should you use iCloud APIs? 1. There’s no need to configure and maintain servers 2. Syncs across all devices without your effort 3. Autosaving and conflict resolving 4. Easily revert to a previous version
- 100. iCloud
- 101. iCloud
- 104. iCloud Document storage Key-value storage
- 105. Document storage Application sandbox
- 107. Document storage Application iCloud-monitored sandbox directory
- 108. Document storage Application iCloud-monitored NSFileManager sandbox directory
- 109. Document storage Application iCloud-monitored NSFileManager sandbox directory
- 110. Document storage setUbiquitous:YES Application iCloud-monitored NSFileManager sandbox directory
- 111. Document storage setUbiquitous:YES Application iCloud-monitored NSFileManager sandbox directory
- 112. Document storage setUbiquitous:YES Application iCloud-monitored NSFileManager sandbox directory setUbiquitous:NO
- 113. Limitations
- 114. Limitations 1. Does not work on simulator
- 115. Limitations 1. Does not work on simulator 2. A provisioning profile and entitlements are needed to test
- 116. Limitations 1. Does not work on simulator 2. A provisioning profile and entitlements are needed to test 3. All files stored in iCloud must be managed by an object that implements NSFilePresenter protocol
- 117. Limitations 1. Does not work on simulator 2. A provisioning profile and entitlements are needed to test 3. All files stored in iCloud must be managed by an object that implements NSFilePresenter protocol UIKit provides UIDocument class which implements NSFilePresenter protocol
- 118. Be responsible!
- 119. Be responsible! 1. Don’t store any auto generated files in iCloud.
- 120. Be responsible! 1. Don’t store any auto generated files in iCloud. 2. Don’t keep any copies of files tracked by iCloud.
- 121. Be responsible! 1. Don’t store any auto generated files in iCloud. 2. Don’t keep any copies of files tracked by iCloud. 3. Be careful with large files. Space is limited.
- 122. Be responsible! 1. Don’t store any auto generated files in iCloud. 2. Don’t keep any copies of files tracked by iCloud. 3. Be careful with large files. Space is limited. 4. Key-value storage has a limit of 64kb.
- 123. Demo
- 124. Where to go from here?
- 125. Where to go from here?
- 126. Where to go from here? http://www.raywenderlich.com/934/core-data-tutorial-getting-started
- 127. Where to go from here? http://www.raywenderlich.com/934/core-data-tutorial-getting-started https://developer.apple.com/videos/wwdc/2011/
- 128. Where to go from here? http://www.raywenderlich.com/934/core-data-tutorial-getting-started https://developer.apple.com/videos/wwdc/2011/ http://developer.apple.com/library/mac/#documentation/cocoa/ Conceptual/Archiving/Archiving.html
- 129. Thank you! https://github.com/Tuszy/UserDefaultsSample https://github.com/Tuszy/NSCacheSample https://github.com/Tuszy/ArchivesSample https://github.com/Tuszy/CoreDataSample https://github.com/Tuszy/iCloudSample @srgtuszy srgtuszy@gmail.com srgtuszy.github.com
Editor's Notes
- #2: \n
- #3: \n
- #4: \n
- #5: \n
- #6: \n
- #7: \n
- #8: \n
- #9: \n
- #10: \n
- #11: \n
- #12: \n
- #13: \n
- #14: \n
- #15: \n
- #16: \n
- #17: \n
- #18: \n
- #19: \n
- #20: \n
- #21: \n
- #22: \n
- #23: \n
- #24: \n
- #25: \n
- #26: \n
- #27: \n
- #28: \n
- #29: \n
- #30: \n
- #31: \n
- #32: \n
- #33: \n
- #34: \n
- #35: \n
- #36: \n
- #37: \n
- #38: \n
- #39: \n
- #40: \n
- #41: \n
- #42: \n
- #43: \n
- #44: \n
- #45: \n
- #46: \n
- #47: \n
- #48: \n
- #49: \n
- #50: \n
- #51: \n
- #52: \n
- #53: \n
- #54: \n
- #55: \n
- #56: \n
- #57: \n
- #58: \n
- #59: \n
- #60: \n
- #61: \n
- #62: \n
- #63: \n
- #64: \n
- #65: \n
- #66: \n
- #67: \n
- #68: \n
- #69: \n
- #70: \n
- #71: \n
- #72: \n
- #73: \n
- #74: \n
- #75: \n
- #76: \n
- #77: \n
- #78: \n
- #79: \n
- #80: \n
- #81: \n
- #82: \n
- #83: \n
- #84: \n
- #85: \n
- #86: \n
- #87: \n
- #88: \n
- #89: \n
- #90: \n
- #91: \n
- #92: \n
- #93: \n
- #94: \n
- #95: \n
- #96: \n
- #97: \n
- #98: \n
- #99: \n
- #100: \n
- #101: \n
- #102: \n
- #103: \n
- #104: \n
- #105: \n
- #106: \n