ios consists of 4 layers.
cocoa Touch
core Media
core services
core OS
Cocoa Touch:
Accelerometer,Multi touch,View hierarchy,image picker,camera,alerts,web view
Core Media:
Core Audio,Audio recording,Open GL,Animations,Quartz
Core Services:
Core Location,Networking,File Access,SQLite,Threading
Core OS:
Sockets,Bonjour,security,Power mgmt,keychain,certificates,File system
cocoa Touch
core Media
core services
core OS
Cocoa Touch:
Accelerometer,Multi touch,View hierarchy,image picker,camera,alerts,web view
Core Media:
Core Audio,Audio recording,Open GL,Animations,Quartz
Core Services:
Core Location,Networking,File Access,SQLite,Threading
Core OS:
Sockets,Bonjour,security,Power mgmt,keychain,certificates,File system
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