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Cheat Sheet:
= Objective-C cheatsheet (cheat obj_c) == Comments // this is an obj-c comment // in this cheatsheet we commented all the optional code == Sending Messages: ---------------------------------------------------------------- | Message Type | Syntax | ---------------------------------------------------------------- | simple message | [receiver message] | | named arguments | [receiver message name1:arg1 name2:arg2] | | anonymous arguments | [receiver message :arg1 :arg2 ] | | typical use | [receiver message:arg1 name2:arg2] | ---------------------------------------------------------------- A receiver is an object, a class, self or super. == Class Definition @interface classname // (category) <protocols> : superclass { @public @protected @private instance variables } method declarations @end The default visibility of instance variables is @protected. == Method Declaration -------------------------------------------------------------------------- | Method Type | Syntax | -------------------------------------------------------------------------- | instance method | -(return type) name :(type) arg1 :(type) arg2 //... | | class method | +(return type) name :(type) arg1 :(type) arg2 | -------------------------------------------------------------------------- == Method Implementation @import “declarations.h” @implementation classname // : superclass -(return type) methodname :(type) arg1 { method implementation } @end == Protocols @protocol protocolname <protocol list> method declarations @end == Exception Handling @try { } @catch (exception) // exception is optional { } //@finally //{ //} @throw(exception); // throw an exception @throw(); // re-throw current exception == Built-in & pre-defined types ------------------------------- | Type | Description | ------------------------------- | BOOL | boolean (YES/NO) | | char | C char | | double | C double | | float | C float | | id | an object | | int | C int | | long | C long | | short | C short | | signed | C signed | | unsigned | C unsigned | | void | no type | ------------------------------- == Thread Synchronization @synchonized(sync object) { // synchronized code } == Special Names ------------------------------------------------------- | Name | Description | ------------------------------------------------------- | nil | the “null” object | | self | refers to the current object in a method | | super | refers to the superclass in a method | ------------------------------------------------------- == Properties (obj-c 2.0) Properties automatically create setter and getter methods for a class attribute. They are declared in the method declaration section. === Declaration @property(attributes) type name; === Attributes -------------------------------------------------------- | Attribute | Description | -------------------------------------------------------- | readonly | read-only | | readwrite | read-write (default) | | assign | simple assignment (default) | | retain | retain method is invoked upon assignment | | copy | use a copy of the object for assignment | | nonatomic | not thread-safe | | getter=name | explicitly name getter | | setter=name | explicitly name setter | -------------------------------------------------------- assign, copy and retain are mutually exclusive. The default attributes are assign and readwrite. In addition to the normal method invocation syntax, dot syntax may be used to access properties: object.property === Implementation @synthesize value = variable; @dynamic value; Fast Enumeration (Objective-C 2.0) for (type variable in expression) { } == Common Messages ------------------------------------------------ | Message | Description | ------------------------------------------------ | alloc | allocate object memory | | init | initialize object instance | | retain | increment object’s reference count | | release | decrement object’s reference count | ------------------------------------------------ ------------------------------------------------------ tnx 2 Ferruccio Barletta (www.the-lazy-programmer.com)

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