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Objective-C

Objective-C/リテラル

Top / Objective-C / リテラル

• http://clang.llvm.org/docs/ObjectiveCLiterals.html
• https://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/Strings/Articles/CreatingStrings.html

NSString

NSString *someString = @"Hello, World!";

は

NSString *someString = [NSString stringWithCString:"Hello, World!" encoding:NSUTF8StringEncoding];

と同等。

• which is assumed to be ‘\0’-terminated and UTF-8 encoded
• There has been support for Unicode in constant @"" NSStrings since Xcode 3.0?
• Prior to Xcode 3.0?, GCC only supported the use of ASCII characters (i.e., characters ≤ 127) in constant NSString literals

Xcode 4.4以降

• Xcode 4.5でiOS 6でも使えるようになった。

NSNumber

• NSNumber *myBOOL = @YES;
  NSNumber *myFloat = @3.14f;
  NSNumber *myInt = @42;
  NSNumber *myLong = @42L;
  NSNumber *myInt = @(84 / 2);//NSNumberの場合、式を埋め込んだ記法も可能。

NSArray @[ ]

• NSArray *gronk = @[ @"hi", @"bork", @23, @YES ];

NSDictionary @{ }

• NSDictionary *splunge = @{ @"hi" :  @"bork", @"greeble" :  @"bork" };

関連

• Objective-C/ファクトリーメソッド
• objectAtIndex
• setObject：forKey?

参考

• http://blog.bignerdranch.com/398-objective-c-literals-part-1/